CN102811067A - General receiving device with adaptable filter - Google Patents
General receiving device with adaptable filter Download PDFInfo
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- CN102811067A CN102811067A CN2011101543251A CN201110154325A CN102811067A CN 102811067 A CN102811067 A CN 102811067A CN 2011101543251 A CN2011101543251 A CN 2011101543251A CN 201110154325 A CN201110154325 A CN 201110154325A CN 102811067 A CN102811067 A CN 102811067A
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Abstract
The invention provides a general receiving device with an adaptable filter. The receiving device comprises an antennae, a low-noise amplifier, a band-pass tracking filter, a single-end rotary differential unit, a mixer and an adaptable filter, wherein the antennae is used for receiving a radio frequency signal; the low-noise amplifier is used for amplifying the radio frequency signal to generate an amplified radio frequency signal; the band-pass tracking filter is used for filtering the amplified radio frequency signal to generate the filtered amplified radio frequency signal; the single-end rotary differential unit is used for converting the filtered amplified radio frequency signal into a differential radio signal; the mixer is used for receiving a local differential oscillation signal to generate a differential intermediate frequency signal; and the adaptable filter is used for filtering the differential IF signal to generate a filtered differential intermediate frequency signal. The general receiving device provided by the invention can be integrated into a single chip and can be used for wireless receiving devices of various specifications without using SAW filters, thereby having good cost performance.
Description
Technical field
The present invention relates to a kind of radio receiver, relate in particular to a kind of general receiving system of tool adaptability filter.
Background technology
The framework of general receiver (receiver) can be divided into single conversion intermediate frequency output (Single Conversion with IF); Single conversion Low Medium Frequency output (Single Conversion with Low IF); Single translated zero intermediate frequency output (Single Conversion with Zero IF); Two conversion intermediate frequency outputs (Dual Conversion with IF); Two conversion Low Medium Frequency outputs (Dual Conversion with Low IF) and two translated zero intermediate frequency outputs (Dual Conversion with Zero IF).Wherein, in the output of single conversion intermediate frequency and the output of two conversion intermediate frequencies and two conversion Low Medium Frequencies output frameworks, intermediate-frequency filter carries out that frequency is selected and the function of filtering.Because surface acoustic wave filter (SAW Filter) has high-quality-factor (quality factor; Q), the advantage of low frequency drift and not power consumption; But surface acoustic wave filter need have particular method of manufacture, be difficult to be integrated in the single wafer, so the normal external surface acoustic wave filter of receiver.
Fig. 1 is the sketch map of the tuner of a use surface acoustic wave filter, and it changes into intermediate-freuqncy signal with a radiofrequency signal, and wherein, surface acoustic wave filter 110 is in the outside of tuner 120.Surface acoustic wave filter has very high quality factor Q value, and preferable frequency selectivity is arranged.Yet it but needs higher price, causes the cost of whole tuner high.Simultaneously; The input impedance of general surface acoustic wave filter is designed to 50 ohm; So in order to drive low-impedance circumscribed surface acoustic wave filter; Surface acoustic wave filter driver (SAW filter driver) 121 just need expend the power consumption of hundreds of milliwatts (mW), moreover surface acoustic wave filter itself has high loss of signal (loss), and loss is the reduction of representation signal noise ratio (SNR).
In order to replace surface acoustic wave filter and to be integrated in the single wafer; The Filter Design method has a variety of; Resistance-capacitance filter (resistor-capacitor filter is wherein arranged; RC filter), switch-capacitor filter (switch-capacitor filter, SC filter) and transduction capacitive filter (G
m-C filter) technology such as.
The resistance-capacitance filter is only applicable to the application of KHz level filter because of operational amplifier is subject to the reason of frequency range, and is not suitable for the intermediate frequency utilization.Its circuit parameter of switch-capacitor filter is set according to the ratio of electric capacity, and in the CMOS manufacturing approach, the ratio of electric capacity can be controlled very accurate.Though the switch-capacitor filter utilizes capacitance ratio decision filter characteristic, is difficult for receiving manufacturing approach to influence, because power consumption reaches the reason that the operational amplifier frequency range is arranged equally, is not suitable for the application of the above filter of 10MHz.
The transduction capacitive filter then is to utilize a transduction amplifier and capacitance simulation to go out resistance and inductive effect.Fig. 2 is the sketch map of a transduction amplifier artifical resistance effect.Wherein, the resistance value of simulation does
G wherein
mTransduction value for transduction amplifier 210.Fig. 3 is the sketch map of two transduction amplifiers and a capacitance simulation inductive effect, and wherein, the inductance value of simulation does
Central C is the capacitance of electric capacity 310, G
1, G
2Be respectively the transduction value of transduction amplifier 320,330.
When design transduction capacitive filter, need design the circuit of resistance, inductance, electric capacity (RLC) filter earlier, as shown in Figure 4, it is the circuit diagram of an existing RLC filter.Again resistance in the circuit diagram of RLC filter and inductance are replaced with the circuit among Fig. 2 and Fig. 3 respectively.Cause the excessive problem of area when therefore, its intermediate-frequency filter uses the design of transduction capacitive filter easily.Simultaneously, because its coefficient of transduction capacitive filter is the product of two kinds of different elements, for example, the inductance value of simulation is the product that the capacitance of electric capacity 310 removes the transduction value of last transduction amplifier 320,330.Aforesaid its coefficient of switch-capacitor filter can be accurate to 0. 1 percent, yet its coefficient of transduction capacitive filter only can have 30 percent accuracy at initial value.
Therefore, when the tuner among Fig. 1 uses surface acoustic wave filter, then have cost too high, and be difficult for the shortcoming of integration, use the transduction capacitive filter if change, then the excessive problem of chip area also produces the too high problem of cost.Simultaneously; In the utilization of many wireless receiving, DVB-T for example, its centre frequency and frequency range are all different; No matter be to use the surface acoustic wave filter or the tuner of transduction capacitive filter; Its centre frequency all is fixing can't adjustment along with using, and therefore, existing receiving system still has and improves part.
Summary of the invention
Main purpose of the present invention is to provide a kind of general receiving system of tool adaptability filter; It need not to use surface acoustic wave filter; Has good cost performance to save cost, can be integrated in the single wafer and can apply in the wireless receiving system of plurality of specifications.
According to characteristics of the present invention; The present invention proposes a kind of general receiving system of tool adaptability filter; It has an antenna, the logical tracking filter (Bandpass Tracking filter) of a band, a low noise amplifier (Low Noise Amplifier, LNA), a single-ended slip moving cell, a mixer and an adaptability filter.This antenna is in order to receive a radiofrequency signal, and this radiofrequency signal has a plurality of bandwidth (band), includes a plurality of channel signals (channel) in each bandwidth.This low noise amplifier is connected to this antenna, and this radiofrequency signal is amplified, and amplifies radiofrequency signal to produce one, and the logical tracking filter of this band is connected to this low noise amplifier this radiofrequency signal is carried out filtering, to produce an amplification filtering radiofrequency signal.This single-ended slip moving cell connects and should lead to tracking filter by band, to transfer this amplification filtering radiofrequency signal to a differential radio frequency signal.This mixer is connected to this single-ended slip moving cell, and receives a differential local oscillated signal, to produce a differential intermediate-freuqncy signal.This adaptability filter is connected to this mixer, and this differential intermediate-freuqncy signal is carried out filtering, to produce the differential intermediate-freuqncy signal of a filtering.
According to another characteristics of the present invention; The present invention proposes a kind of general receiving system of tool adaptability filter, comprises an antenna, the logical tracking filter of a band, a low noise amplifier, a single-ended slip moving cell, one first mixer, one first adaptability filter, one second mixer, one second adaptability filter and a filtering intermediate-freuqncy signal automatic gain amplifier.This antenna is in order to receive a radiofrequency signal, and this radiofrequency signal has a plurality of bandwidth, includes a plurality of channel signals in this each bandwidth.This low noise amplifier is connected to this antenna, and this radiofrequency signal is amplified, and amplifies radiofrequency signal to produce one, and the logical tracking filter of this band is connected to this low noise amplifier this radiofrequency signal is carried out filtering, to produce an amplification filtering radiofrequency signal.This single-ended slip moving cell connects and should lead to tracking filter by band, to transfer this amplification filtering radiofrequency signal to a differential radio frequency signal.This first mixer is connected to this single-ended slip moving cell, and receives one first differential local oscillated signal, to produce one first differential intermediate-freuqncy signal.This first adaptability filter is connected to this first mixer, and this differential intermediate-freuqncy signal is carried out filtering, to produce differential first intermediate-freuqncy signal of a filtering.This second mixer is connected to this first adaptability filter, and receives one second differential local oscillated signal, to produce one second differential intermediate-freuqncy signal.This second adaptability filter is connected to this second mixer, and this second differential intermediate-freuqncy signal is carried out filtering, to produce differential second intermediate-freuqncy signal of a filtering.This filtering intermediate-freuqncy signal automatic gain amplifier is connected to this second adaptability filter, differential second intermediate-freuqncy signal of this filtering is amplified, to produce the differential intermediate-freuqncy signal of an amplification filtering.
Description of drawings
Fig. 1 is the sketch map of the tuner of a use surface acoustic wave filter;
Fig. 2 is the sketch map of a transduction amplifier artifical resistance effect;
Fig. 3 is the sketch map of two transduction amplifiers and a capacitance simulation inductive effect.
Fig. 4 is the circuit diagram of an existing RLC filter;
Fig. 5 is the calcspar of the general receiving system of a kind of tool adaptability of the present invention filter;
Fig. 6 is the spectrum diagram of radiofrequency signal of the present invention and filtering radiofrequency signal;
Fig. 7 is the calcspar of adaptability filter of the present invention;
Fig. 8 is the sketch map of the frequency spectrum of adaptability filter of the present invention, first filter, second filter and the 3rd filter;
Fig. 9 is the circuit diagram of the present invention's first filter, second filter and the 3rd filter;
Figure 10 is the circuit diagram in electric capacity of the present invention storehouse;
Figure 11 is the sketch map of adaptability filter spectrum simulation of the present invention;
Figure 12 is the sketch map of the present invention's first filter, second filter and one the 3rd filter spectrum;
Figure 13 is the calcspar of general another embodiment of receiving system of a kind of tool adaptability of the present invention filter.
[main element symbol description]
Surface acoustic wave filter driver 121
Transduction amplifier 320,330
The general receiving system 500 of tool adaptability filter
The logical tracking filter 530 of antenna 510 bands
Mixer 550 adaptability filters 560
Filtering intermediate-freuqncy signal automatic gain amplifier 570
Filter 565 first filters 565,1
The frequency spectrum 610 of frequency spectrum 600 first filters of filter
The frequency spectrum 630 of frequency spectrum 620 the 3rd filter of second filter
The one PMOS transistor 705 the 2nd PMOS transistor 710
First inductance, 715 first variable capacitances 720
First variable resistor, 725 the second adjustable resistances 730
The 3rd variable resistor 735 first nmos pass transistors 740
Second nmos pass transistor 745 the 3rd nmos pass transistor 750
Electric capacity choice device 810 electric capacity 820
Switching device shifter 830 electric capacity storehouse controllers 840
The general receiving system 1200 of tool adaptability filter
The logical tracking filter 530 of antenna 510 bands
First mixer, 1,210 first adaptability filters 1220
Second mixer, 1,230 second adaptability filters 1240
Filtering intermediate-freuqncy signal automatic gain amplifier 570
First local oscillator, 1,250 second local oscillators 1260.
Embodiment
Fig. 5 is the calcspar of the general receiving system 500 of a kind of tool adaptability of the present invention filter; The general receiving system 500 of this tool adaptability filter comprises an antenna 510, logical tracking filter (Bandpass Tracking filter) 530, one low noise amplifier of a band (Low Noise Amplifier, LNA) 520, one single-ended slip moving cell 540, a mixer 550, an adaptability filter 560, a filtering intermediate-freuqncy signal automatic gain amplifier (IF AGC) 570 and one local oscillator 580.
This antenna 510 is in order to receive a radiofrequency signal, and this radiofrequency signal has a plurality of bandwidth, includes a plurality of channel signals (channel) in this each bandwidth.
This low noise amplifier 520 is connected to this antenna 510, and this radiofrequency signal is amplified, and amplifies radiofrequency signal to produce one.
The logical tracking filter 530 of this band is connected to this low noise amplifier 520, this amplification radiofrequency signal is carried out filtering, to produce an amplification filtering radiofrequency signal.The logical tracking filter 530 of this band is a band selecting filter (band selective filter); Only comprise a plurality of channel signals in the specific bandwidth in this filtering radiofrequency signal, and the centre frequency of this specific bandwidth is the centre frequency of the logical tracking filter of this band.Fig. 6 is the spectrum diagram of radiofrequency signal of the present invention and filtering radiofrequency signal.As shown in Figure 6, the logical tracking filter 530 of this band lets a plurality of channel signals among the bandwidth A pass through, and the signal of other bandwidth of filtering (bandwidth B, bandwidth C).That is the logical tracking filter 530 of this band is the image signal filtering, in order to avoid image signal overlaps together with the channel signals that needs via these mixer 550 backs, and destructions need channel signals.
This single-ended slip moving cell 540 is connected to the logical tracking filter 530 of band, to transfer this amplification filtering radiofrequency signal to a differential radio frequency signal.Produce this differential radio frequency signal through this single-ended slip moving cell 540; Letting follow-up processing unit, with the substrate noise (substrate noise) of refusing common noise, a follow-up digital circuit or the noise that sequential was produced of a follow-up digital circuit all with differential mode processing signals.
This mixer 550 is connected to this single-ended slip moving cell 540, and receives a differential local oscillated signal (LO), to produce a differential intermediate-freuqncy signal.This mixer 550 is reduced to intermediate frequency with this differential radio frequency signal by radio frequency.This mixer 550 utilizes this differential local oscillated signal that is higher than one times of intermediate frequency to carry out smear, and the differential radio frequency signal down is arrived the intermediate frequency frequency range.
This adaptability filter 560 is connected to this mixer 550, and this differential intermediate-freuqncy signal is carried out filtering, to produce the differential intermediate-freuqncy signal of a filtering.This adaptability filter 560 is a channel select filter, and the differential intermediate-freuqncy signal of this filtering is a special channels signal in this specific bandwidth.The channel signals that this adaptability filter 560 lets to be needed passes through, and other channel signals of filtering.
This filtering intermediate-freuqncy signal automatic gain amplifier 570 is connected to this adaptability filter 560; The differential intermediate-freuqncy signal of this filtering is amplified; (IF1 IF2), thereby supplies the subsequent treatment unit to produce the differential intermediate-freuqncy signal of an amplification filtering; For example: demodulator (demodulator), carry out subsequent treatment.
This local oscillator 580 is connected to this mixer 550, to produce this differential local oscillated signal.
The general receiving system 500 of this tool adaptability filter is removed image signal through the logical tracking filter 530 of this band; Utilize this mixer 550 to mix out this differential intermediate-freuqncy signal with this differential local oscillated signal; Select the channel signals that needs via this adaptability filter 560 at last, and remove other unwanted channel signals.
Fig. 7 is the calcspar of adaptability filter 560 of the present invention, and it is applied in the radio receiver, and this radio receiver is preferably a tuner.Adaptability filter 560 is formed by odd number filter 565 serial connections, for example is that 3,5,7 filters, 565 serial connections form.Be convenient explanation, only to be connected in series 565 explanations of 3 filters, those skilled in the art should be able to extend to the situation that other odd number filter 565 serial connections form based on technology of the present invention to present embodiment easily.
This adaptability filter 560 comprises one first filter 1, one second filter 2 and one the 3rd filter 3.
This first filter 1 have a relatively low value first quality factor (quality factor, Q1), in order to frequency range and the centre frequency that defines this adaptability filter 560.This second filter 2 is connected to this first filter 1, has second quality factor (Q2) of a relative high value, and the frequency spectrum of this first filter 1 and this second filter 2 is in order to the f of low frequency place in the frequency range that defines this adaptability filter 560
LFrequency and the sharpness at the low frequency place in this frequency range.The 3rd filter 3 is connected to this second filter 2, has the 3rd quality factor (Q3) of a relative high value, and the frequency spectrum of this first filter 1 and the 3rd filter 3 is in order to the frequency f of the high frequency treatment in the frequency range that defines this adaptability filter 560
HAnd the sharpness of the high frequency treatment in this frequency range.Wherein, the value of this first quality factor q 1 is 5～15, and the value of this second quality factor q 2 and the 3rd quality factor Q3 is more than 15.
Fig. 8 is the sketch map of the frequency spectrum of adaptability filter of the present invention 560, first filter 1, second filter 2 and the 3rd filter 3.As shown in Figure 8, line 610 is the frequency spectrum of this first filter 1, and the value of its first quality factor q 1 is lower, is about 5～15, so its frequency range is bigger.Because this first filter 1 can be symmetric design, so the centre frequency fc1 of this first filter 1 can be used as the centre frequency fc of adaptability filter 560.
By shown in Figure 8, the frequency spectrum of the frequency spectrum of this first filter 1 and this second filter 2 is in order to the frequency f at the low frequency place in the frequency range that defines this adaptability filter 560
LAnd the sharpness at the low frequency place in this frequency range, shown in Fig. 8 circle A.Likewise, the frequency spectrum of the frequency spectrum of this first filter 1 and the 3rd filter 3 is in order to the frequency f of the high frequency treatment in the frequency range that defines this adaptability filter 560
HAnd the sharpness of the high frequency treatment in this frequency range, shown in Fig. 8 circle B.
Fig. 9 is the circuit diagram of each this first filter 1 of the present invention, second filter 2 and the 3rd filter 3.Can know that by circuit diagram the centre frequency and the gain of first filter 1, second filter 2 and the 3rd filter 3 are and can adjust.
As shown in Figure 9, each this first filter 1, this second filter 2 and the 3rd filter 3 are made up of one the one PMOS transistor 705, one the 2nd PMOS transistor 710, one first inductance 715, one first variable capacitance 720, one first variable resistor 725, a second adjustable resistance 730, one the 3rd variable resistor 735, one first nmos pass transistor 740, one second nmos pass transistor 745 and 750 of one the 3rd nmos pass transistors.
The source electrode of the one PMOS transistor 705 and the 2nd PMOS transistor 710 is connected to a high potential).The grid of the one PMOS transistor 705 and the 2nd PMOS transistor 710 is connected to one first bias (Vbias1).
The drain electrode of the one PMOS transistor 705 is connected to an end of this first inductance 715, an end of this first variable capacitance 720, an end of this first variable resistor 725 and the drain electrode of this first nmos pass transistor 740.The drain electrode of the 2nd PMOS transistor 710 is connected to the other end of this first inductance 715, the other end of this first variable capacitance 720, the other end of this first variable resistor 725 and the drain electrode of this second nmos pass transistor 745.
The grid of this first nmos pass transistor 740 and this second nmos pass transistor 745 receives a differential voltage (Vinp; Vinn); The source electrode of this first nmos pass transistor 740 is connected to an end of this second adjustable resistance 730; The source electrode of this second nmos pass transistor 745 is connected to an end of the 3rd variable resistor 735; The other end of this second adjustable resistance 730 is connected to the drain electrode of the other end and the 3rd nmos pass transistor 750 of the 3rd variable resistor 735, and the grid of the 3rd nmos pass transistor 750 is connected to one second bias voltage (Vbias2), and the source electrode of the 3rd nmos pass transistor 750 is connected to an electronegative potential (Vss).
In each in this first filter 1, this second filter 2 and the 3rd filter 3, a PMOS transistor 705, the 2nd PMOS transistor 710, first variable capacitance 720, first variable resistor 725, the second adjustable resistance 730, the 3rd variable resistor 735, first nmos pass transistor 740, second nmos pass transistor 745 and the 3rd nmos pass transistor 750 are incorporated in the same integrated circuit.715 of first inductance of this first filter 1, this second filter 2 and the 3rd filter 3 are hung on outward outside this integrated circuit, perhaps also can be incorporated in the wafer, but must note the method for manufacturing inductance variability.
Be noted that; The structure of this first filter 1, this second filter 2 and the 3rd filter 3 is identical in this case, but the value of first variable capacitance 720 in each filter, first variable resistor 725, the second adjustable resistance 730, the 3rd variable resistor 735 and inequality.Same, but but also inequality of corresponding these first inductance, 715 its inductance value of each filter can be adjusted gain, centre frequency and the frequency range of this first filter 1, this second filter 2 and the 3rd filter 3 thus.
In the time will adjusting the gain of this filter 500; Can simultaneously the second adjustable resistance 730 of each filter, the value of the 3rd variable resistor 735 be adjusted change greatly together; Then the entire gain of this filter 500 diminishes, otherwise then the entire gain of this filter 500 becomes big.
When the centre frequency that will adjust this filter 500 and frequency range do not change, can first variable capacitance 720 in each filter be adjusted together then also and then adjustment of the centre frequency of filter 500.That is when first variable capacitance, 720 adjustment in each filter 1,2,3 are diminished, so the centre frequency fc of this filter 500 promptly moves toward high frequency.Otherwise when first variable capacitance, 720 adjustment in each filter 1,2,3 are become big, so the centre frequency fc of this filter 500 promptly moves toward low frequency.
When the frequency range that will adjust this filter 500 and centre frequency do not change; Can first variable capacitance, 720 adjustment in second filter 2 be diminished; The centre frequency fc2 of second filter 2 like this promptly moves toward high frequency; First variable capacitance, 720 adjustment in the 3rd filter 3 are become big, and the centre frequency fc3 of the 3rd filter 3 like this promptly moves toward low frequency, and the whole structure that it produced then is that the frequency range of this filter 500 diminishes and centre frequency does not change.Otherwise; First variable capacitance, 720 adjustment in second filter 2 are become big; The centre frequency fc2 of second filter 2 like this promptly moves toward low frequency; First variable capacitance, 720 adjustment in the 3rd filter 3 are diminished, and the centre frequency fc3 of the 3rd filter 3 like this promptly moves toward high frequency, and the whole structure that it produced then is that the frequency range of this filter 500 becomes big and centre frequency does not change.
As shown in Figure 9, in each in this first filter 1, this second filter 2 and the 3rd filter 3, because it is a symmetric design, so the resistance of this second adjustable resistance 730 is identical with the resistance of the 3rd variable resistor 735.
The structure of this first filter 1, this second filter 2 and the 3rd filter 3 can be considered source-electrode degradation (source degeneration); Therefore; The gain of this first filter 1 is the resistance of the second adjustable resistance 730 of this first filter 1 on the resistance value ratio of first variable resistor 725 of this first filter 1; The gain of this second filter 2 is the resistance of the second adjustable resistance 730 of this second filter 2 on the resistance value ratio of first variable resistor 725 of this second filter 2, and the gain of the 3rd filter 3 is the resistance of the second adjustable resistance 730 of the 3rd filter 3 on the resistance value ratio of first variable resistor 725 of the 3rd filter 3.
The frequency range of this first filter 1 and centre frequency are by first inductance 715, first variable capacitance 720 and 725 decisions of first variable resistor of this first filter 1; The frequency range of this second filter 2 and centre frequency be by first inductance 715, first variable capacitance 720 and 725 decisions of first variable resistor of this second filter 2, and the frequency range of the 3rd filter 3 and centre frequency are by first inductance 715, first variable capacitance 720 and 725 decisions of first variable resistor of the 3rd filter 3.
First variable capacitance 720 of each this first filter 1, this second filter 2 and the 3rd filter 3 is an electric capacity storehouse (capacitor bank).First variable resistor 725, the second adjustable resistance 730 and the 3rd variable resistor 735 of each this first filter 1, this second filter 2 and the 3rd filter 3 are a resistance storehouse (resistor bank).
Figure 10 is the circuit diagram in electric capacity of the present invention storehouse.Shown in figure 10, this electric capacity storehouse comprises many group electric capacity choice devices 810 and an electric capacity storehouse controller 840, and each group electric capacity choice device 810 comprises N electric capacity 820 and N switching device shifter 830, and wherein N is the integer greater than 1.
N the switching device shifter 830 of this each group electric capacity choice device 810 is nmos pass transistor, and its grid is connected to this electric capacity storehouse controller 840.
In present embodiment, the electric capacity in this each group electric capacity choice device 810 can be base-emitter junction capacitance (base-emitter junction capacitor), metal-oxide half field effect transistor electric capacity (MOSFET capacitor), polycrystal-polycrystalline electric capacity (poly-poly capacitor).In other embodiment, the electric capacity in this each group electric capacity choice device 810 also can be metal-insulator-metal form electric capacity (metal-insulator-metal capacitor, MIM cap).
Shown in figure 10, the electric capacity in this electric capacity storehouse can formula be represented:
C
Paracitic+B[1]×C
B1+B[2]×C
B2+B[3]×C
B3+B[4]×C
B4+B[5]×C
B5，
Wherein, C
ParaciticRepresent the parasitic capacitance in the circuit, C
B1, C
B2, C
B3, C
B4, C
B5Be the electric capacity in these many group electric capacity choice devices 810, B [1], B [2], B [3], B [4], B [5] is the control signal that this electric capacity storehouse controller 840 exports this electric capacity storehouse to, can use B [i] expression, C
B5Be the electric capacity in the electric capacity choice device 810 corresponding, C with control signal B [5]
B4For the electric capacity in the electric capacity choice device 810 corresponding, analogize in regular turn with control signal B [4].Wherein, when B [i] is 0, make corresponding not conducting of nmos pass transistor, electric capacity then can be considered suspension (floating), and does not have the effect of electric capacity.When B [i] is 1, make corresponding nmos pass transistor conducting, electric capacity then can be considered ground connection, and produces the effect of electric capacity.The present invention can adjust the capacitance of first variable capacitance 720 through the control signal of these electric capacity storehouse controller 840 outputs.Based on Figure 10 of the present invention, likewise, this first variable resistor 725, the second adjustable resistance 730 and the 3rd variable resistor 735 also are that those skilled in the art can be unlabored according to technology of the present invention.
Figure 11 is the sketch map of adaptability filter 560 frequency spectrums simulation of the present invention.This adaptability filter 560 is made up of three filters.Have now in the frequency spectrum of surface acoustic wave filter, locating by frequency band (stop band), its gain promptly no longer descends, and this can let has higher amplitudes and the signal of noise jamming desire reception by the frequency band place.Review the present invention, shown in figure 11, at circle C, D place, though for ending frequency band, its gain is still descending, and this can be avoided receiving signal by noise jamming institute desire of frequency band.
Figure 12 is the sketch map of the present invention's first filter, second filter and one the 3rd filter spectrum.Shown in figure 12; Dotted portion is the frequency spectrum of this first filter 1; It has bigger frequency range; Abundant line part then adds the frequency spectrum of this second filter 2 for this first filter 1, the solid line part then adds that for this first filter 1 this second filter 2 is at the frequency spectrum that adds this second filter 3.Because the equal gain adjustable of each filter; So the filter of being made up of first filter 1, one second filter 2 and one the 3rd filter 3 500 is 20dB in its gain of frequency 36MHz place; Its gain is-5dB to still have-12dB in its gain of frequency 32MHz place at frequency 40MHz place.
Figure 13 is the calcspar of general receiving system 1200 another embodiment of a kind of tool adaptability of the present invention filter, and it is the output of two conversion intermediate frequency.The general receiving system 1200 of this tool adaptability filter comprises the single-ended slip moving cell of the logical tracking filter of an antenna 510, a band 530, a low noise amplifier 520, one 540, one first mixer 1210, one first adaptability filter 1220, one second mixer 1230, one second adaptability filter 1240, a filtering intermediate-freuqncy signal automatic gain amplifier 570, one first local oscillator 1250 and one second local oscillator 1260.
Wherein, antenna 510, the logical tracking filter 530 of band, low noise amplifier 520, single-ended slip moving cell 540 and filtering intermediate-freuqncy signal automatic gain amplifier (IF AGC) 570 are identical with element among Fig. 5, will not give unnecessary details.
This first mixer 1210 is connected to this single-ended slip moving cell 540, and receives one first differential local oscillated signal, to produce one first differential intermediate-freuqncy signal.This first adaptability filter 1220 is connected to this first mixer 1210, and this differential intermediate-freuqncy signal is carried out filtering, to produce differential first intermediate-freuqncy signal of a filtering.
This second mixer 1230 is connected to this first adaptability filter 1220, and receives one second differential local oscillated signal, to produce one second differential intermediate-freuqncy signal.This second adaptability filter 1240 is connected to this second mixer 1230, and this second differential intermediate-freuqncy signal is carried out filtering, to produce differential second intermediate-freuqncy signal of a filtering.
This first local oscillator 1250 is connected to this first mixer 1210, to produce this first differential local oscillated signal.This second local oscillator 1260 is connected to this second mixer 1230, to produce this second differential local oscillated signal.Through above structure, also can reach effect with last embodiment.
Can know that by above stated specification the advantage of adaptability filter of the present invention is:
1. there are not insertion loss (Insertion loss) and the gain adjustable under low noise.
2. the parameter of adaptability filter is for adjusting:
The adjustable gain of ■;
The adjustable frequency range of ■;
The adjustable centre frequency of ■.
3. be integrated in the single-chip easily, and existing G
m-C filter has less area.
4. need not to use surface acoustic wave filter, to save cost.
Because the general receiving system of tool adaptability filter of the present invention uses this adaptability filter; The general receiving system of this tool adaptability filter has adjustable centre frequency, gain etc.; So can apply in the wireless receiving system of plurality of specifications; And can be integrated in the single wafer, and have splendid cost performance (cost performance ratio).
From the above, no matter the present invention all shows it totally different in the characteristic of prior art with regard to purpose, means and effect, has practical value.But it should be noted, above-mentioned many embodiment be merely be convenient to the explanation and give an example, the interest field that the present invention advocated should be as the criterion so that claims are said, but not only limits to the foregoing description.
Claims (16)
1. the general receiving system of a tool adaptability filter comprises:
One antenna, in order to receive a radiofrequency signal, this radiofrequency signal has a plurality of bandwidth, includes a plurality of channel signals in each bandwidth;
One low noise amplifier is connected to this antenna, and this radiofrequency signal is amplified, and amplifies radiofrequency signal to produce one;
The logical tracking filter of one band is connected to this low noise amplifier, this amplification radiofrequency signal is carried out filtering, to produce an amplification filtering radiofrequency signal;
One single-ended slip moving cell is connected to the logical tracking filter of this band, to transfer this amplification filtering radiofrequency signal to a differential radio frequency signal;
One mixer is connected to this single-ended slip moving cell, and receives a differential local oscillated signal, to produce a differential intermediate-freuqncy signal; And
One adaptability filter is connected to this mixer, and this differential intermediate-freuqncy signal is carried out filtering, to produce the differential intermediate-freuqncy signal of a filtering.
2. the general receiving system of tool adaptability filter as claimed in claim 1, it also comprises:
One filtering intermediate-freuqncy signal automatic gain amplifier is connected to this adaptability filter, the differential intermediate-freuqncy signal of this filtering is amplified, to produce the differential intermediate-freuqncy signal of an amplification filtering.
3. the general receiving system of tool adaptability filter as claimed in claim 2, it also comprises:
One local oscillator is connected to this mixer, to produce this differential local oscillated signal.
4. the general receiving system of tool adaptability filter as claimed in claim 3; Wherein, The logical tracking filter of this band is a band selecting filter; Only comprise a plurality of channel signals in the specific bandwidth in this filtering radiofrequency signal, and the centre frequency of this specific bandwidth is the centre frequency of the logical tracking filter of this band.
5. the general receiving system of tool adaptability filter as claimed in claim 4, wherein, this adaptability filter is a channel select filter, the differential intermediate-freuqncy signal of this filtering is a special channels signal in this specific bandwidth.
6. the general receiving system of tool adaptability filter as claimed in claim 5, wherein, this adaptability filter has high input impedance.
7. the general receiving system of tool adaptability filter as claimed in claim 6, wherein, this adaptability filter comprises:
One first filter has one first quality factor, in order to frequency range and the centre frequency that defines this adaptability filter;
One second filter is connected to this first filter, has one second quality factor, and the frequency spectrum of this first filter and this second filter is in order to the frequency at the low frequency place in the frequency range that defines this adaptability filter and the sharpness at the low frequency place in this frequency range; And
One the 3rd filter is connected to this second filter, has one the 3rd quality factor, and the frequency spectrum of this first filter and the 3rd filter is in order to the frequency of the high frequency treatment in the frequency range that defines this adaptability filter and the sharpness of the high frequency treatment in this frequency range;
Wherein, the value of this first quality factor is 5～15, and the value of this second quality factor and the 3rd quality factor is more than 15.
8. the general receiving system of tool adaptability filter as claimed in claim 7; Wherein, each of this first filter, this second filter and the 3rd filter is made up of one the one PMOS transistor, one the 2nd PMOS transistor, one first inductance, one first variable capacitance, one first variable resistor, a second adjustable resistance, one the 3rd variable resistor, one first nmos pass transistor, one second nmos pass transistor and one the 3rd nmos pass transistor.
9. the general receiving system of tool adaptability filter as claimed in claim 8; Wherein, In each of this first filter, this second filter and the 3rd filter; The one PMOS transistor and the transistorized source electrode of the 2nd PMOS are connected to a high potential; The one PMOS transistor and the transistorized grid of the 2nd PMOS are connected to one first bias; The one PMOS transistor drain is connected to the drain electrode of an end, this first variable-resistance end and this first nmos pass transistor of an end, this first variable capacitance of this first inductance; The 2nd PMOS transistor drain is connected to the drain electrode of the other end, this first variable-resistance other end and this second nmos pass transistor of the other end, this first variable capacitance of this first inductance, and the grid of this first nmos pass transistor and this second nmos pass transistor receives a differential voltage, and the source electrode of this first nmos pass transistor is connected to an end of this second adjustable resistance; The source electrode of this second nmos pass transistor is connected to the 3rd a variable-resistance end; The other end of this second adjustable resistance is connected to the drain electrode of the 3rd variable-resistance other end and the 3rd nmos pass transistor, and the grid of the 3rd nmos pass transistor is connected to one second bias voltage, and the source electrode of the 3rd nmos pass transistor is connected to an electronegative potential.
10. the general receiving system of tool adaptability filter as claimed in claim 9; Wherein, In each of this first filter, this second filter and the 3rd filter, a PMOS transistor of this first filter, this second filter and the 3rd filter, the 2nd PMOS transistor, first variable capacitance, first variable resistor, the second adjustable resistance, the 3rd variable resistor, first nmos pass transistor, second nmos pass transistor and the 3rd nmos pass transistor are incorporated in the same integrated circuit.
11. the general receiving system of tool adaptability filter as claimed in claim 10, wherein, in each of this first filter, this second filter and the 3rd filter, the resistance of this second adjustable resistance is identical with the 3rd variable-resistance resistance.
12. the general receiving system of tool adaptability filter as claimed in claim 11; Wherein, The gain of this first filter is the resistance of the second adjustable resistance of this first filter on the first variable-resistance resistance value ratio of this first filter; The gain of this second filter is the resistance of the second adjustable resistance of this second filter on the first variable-resistance resistance value ratio of this second filter, and the gain of the 3rd filter is the resistance of the second adjustable resistance of the 3rd filter on the first variable-resistance resistance value ratio of the 3rd filter.
13. the general receiving system of tool adaptability filter as claimed in claim 12; Wherein, The frequency range of this first filter and centre frequency are determined by first inductance, first variable capacitance and first variable resistor of this first filter; The frequency range of this second filter and centre frequency are determined that by first inductance, first variable capacitance and first variable resistor of this second filter the frequency range of the 3rd filter and centre frequency are determined by first inductance, first variable capacitance and first variable resistor of the 3rd filter.
14. the general receiving system of tool adaptability filter as claimed in claim 13, wherein, the centre frequency of this second filter is less than the centre frequency of this first filter, and the centre frequency of this first filter is less than the centre frequency of the 3rd filter.
15. the general receiving system of a tool adaptability filter comprises:
One antenna, in order to receive a radiofrequency signal, this radiofrequency signal has a plurality of bandwidth, includes a plurality of channel signals in each bandwidth;
One low noise amplifier is connected to this antenna, and this radiofrequency signal is amplified, and amplifies radiofrequency signal to produce one;
The logical tracking filter of one band is connected to this low noise amplifier, this amplification radiofrequency signal is carried out filtering, to produce an amplification filtering radiofrequency signal;
One single-ended slip moving cell is connected to the logical tracking filter of this band, to transfer this amplification filtering radiofrequency signal to a differential radio frequency signal;
One first mixer is connected to this single-ended slip moving cell, and receives one first differential local oscillated signal, to produce one first differential intermediate-freuqncy signal;
One first adaptability filter is connected to this first mixer, and this differential intermediate-freuqncy signal is carried out filtering, to produce differential first intermediate-freuqncy signal of a filtering;
One second mixer is connected to this first adaptability filter, and receives one second differential local oscillated signal, to produce one second differential intermediate-freuqncy signal;
One second adaptability filter is connected to this second mixer, and this second differential intermediate-freuqncy signal is carried out filtering, to produce differential second intermediate-freuqncy signal of a filtering;
One filtering intermediate-freuqncy signal automatic gain amplifier is connected to this second adaptability filter, differential second intermediate-freuqncy signal of this filtering is amplified, to produce the differential intermediate-freuqncy signal of an amplification filtering.
16. the general receiving system of tool adaptability filter as claimed in claim 15, it also comprises:
One first local oscillator is connected to this first mixer, to produce this first differential local oscillated signal; And
One second local oscillator is connected to this second mixer, to produce this second differential local oscillated signal.
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| CN2011101543251A CN102811067A (en) | 2011-06-02 | 2011-06-02 | General receiving device with adaptable filter |
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| CN2011101543251A CN102811067A (en) | 2011-06-02 | 2011-06-02 | General receiving device with adaptable filter |
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| US20100329158A1 (en) * | 2009-06-27 | 2010-12-30 | Qualcomm Incorporated | Rf single-ended to differential converter |
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| CN1420625A (en) * | 2001-11-16 | 2003-05-28 | 松下电器产业株式会社 | Variable gain amplifier and filter circuit |
| CN1868133A (en) * | 2003-08-28 | 2006-11-22 | Gct半导体公司 | System and method for filtering signals in a transceiver |
| US20100148849A1 (en) * | 2008-12-16 | 2010-06-17 | Electronics And Telecommunications Research Institute | Signal converter for wireless communication and receiving device using the same |
| US20100329158A1 (en) * | 2009-06-27 | 2010-12-30 | Qualcomm Incorporated | Rf single-ended to differential converter |
| CN101764625A (en) * | 2009-12-30 | 2010-06-30 | 北京北方烽火科技有限公司 | Carrier adaptive filtering method and system of zero intermediate frequency, and zero intermediate frequency receiver |
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Application publication date: 20121205 |