CN201966902U - Multi-channel radio frequency circuit with high consistency - Google Patents
Multi-channel radio frequency circuit with high consistency Download PDFInfo
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Abstract
The utility model discloses a multi-channel radio frequency circuit with high consistency, which comprises a local oscillator source, a plurality of broadband radio frequency transceiver unit, and a transceiver antenna system. The multi-channel radio frequency circuit with the high consistency is characterized in that each broadband radio frequency transceiver unit comprises a transmitting signal processing unit and a receiving signal processing unit; the transmitting signal processing unit and the receiving signal processing unit respectively comprise a mixer; and corresponding mixers are respectively connected with high frequency signals with different frequencies outputted by the local oscillator source. The multi-channel radio frequency circuit with the high consistency effectively solves the problems that a communication system is very strict on parameters such as frequency stability, phase noises, and channel consistency of signals of the local oscillator source, and leads modulated and demodulated signals to have consistent pluses and linearity; a power amplifier adopts an A/D combined analog predistortion technology combined with digital analog, so as to lead the multi-channel radio frequency circuit to achieve accurate amplitude and phase predistortion in a boarder bandwidth scope.
Description
Technical field
The utility model relates to a kind of high conforming multichannel radio circuit that has, and in particular, relates in particular to the high conforming multichannel radio circuit that has that a kind of transmitting circuit, collection of letters circuit and other channels are all shared the local vibration source signal.
Background technology
Domestic these years wireless communication field development, especially the research of Gbps broadband wireless MIMO-OFDM transmission needs to develop broadband multiaerial system and many radio systems that can satisfy the Gbps transmission more urgently.Along with developing rapidly of radio frequency integrated circuit, the radio system chip of collection transceiver more and more trends towards miniaturization, broadband/multibandization and high performance, does not also occur but the bandwidth of high integration radio frequency chip reaches the System on Chip/SoC of 100MHz.
The OFDM orthogonal frequency division multiplexi is very responsive to sample clock frequency deviation: its performance decrease depends on the numbering of subcarrier and is proportional to
When full load, the decline of average behavior along with
Increase and increase; To given
, then sensitiveness depends on the sub-carrier number of load; In order to obtain less performance loss, then requirement
And ofdm system is equally very responsive to the sampling clock shake, and its performance loss that causes mainly depends on the variance of shake; Because the OFDM-MIMO wireless communication system is very responsive for parameters such as the frequency stability of local oscillation signal, phase noise, channel consistency, does not also have a kind of method preferably to address this problem now.
Summary of the invention
The utility model provides a kind of modulation circuit, demodulator circuit and other channels all to share the high conforming multichannel radio circuit that has of local vibration source signal in order to overcome the shortcoming of above-mentioned technical problem.
Of the present utility model have a high conforming multichannel radio circuit, comprise the local vibration source that is used to produce at least two kinds of high-frequency signals, be used for modulating and carry out some wide band radio-frequency Transmit-Receive Units of demodulation to received signal and be used for that signal receives and the dual-mode antenna system of emission that its special feature is: described wide band radio-frequency Transmit-Receive Unit comprises transmit processing unit and received signal processing unit to transmitting; All comprising frequency mixer and corresponding frequency mixer in described transmit processing unit and the received signal processing unit is connected with the high-frequency signal of the different frequency of local vibration source output respectively.Local vibration source is used for producing the high-frequency carrier signal of radio circuit, so that baseband signal is carried out up-conversion and the radiofrequency signal that receives is carried out down-conversion; The dual-mode antenna system is used for receiving and sending high-frequency signal.The high-frequency signal of the different frequency that the frequency mixer of processing unit and received signal processing unit of transmitting all sends with local vibration source links to each other, and has satisfied the conforming requirement of frequency stability, phase noise, channel to signal.
Of the present utility model have a high conforming multichannel radio circuit, and the described processing unit that transmits comprises intermediate frequency amplifier, numerical-control attenuator, band pass filter, frequency mixer, band pass filter, the power amplifier that the baseband signal of input is handled successively; The output of described power amplifier is connected with circulator, and this circulator is connected with the dual-mode antenna system via band pass filter.Adopt intermediate frequency amplifier and power amplifier, just be equivalent to increase the gain G of concatenation system, the noise factor of the processing unit that helps reducing transmitting; The front-end and back-end of frequency mixer are provided with band pass filter, are used for the outer noise signal of filtering corresponding band.Circulator is realized received signal and the isolation that transmits, and realizes the duplex transmitting-receiving of signal.
Of the present utility model have a high conforming multichannel radio circuit, described received signal processing unit comprises being received by antenna, and analog radio frequency switch, two low noise amplifiers, band pass filter, frequency mixer, band pass filter, amplifier and AGC control units of handling successively through the signal to be demodulated of circulator output.Low noise amplifier is used for the high frequency small-signal is amplified, and band pass filter is used for the signal after amplifying is carried out filtering; Frequency mixer is used for the high-frequency signal mixing that the high-frequency signal that will receive and local vibration source send.The AGC control unit is used to guarantee the consistency of each received signal processing unit gain.
Of the present utility model have a high conforming multichannel radio circuit, described power amplifier is high linear power amplifier, it comprises simulated pre-distortion circuit, and this simulated pre-distortion circuit comprises and is used for the coupling circuit that the high-frequency signal of power amplifier output is taken a sample, demodulator, training algorithm module and the predistorter that is used for high-frequency signal is carried out down-conversion; The output of described coupling circuit is connected with the input of demodulator via frequency mixer, and described demodulator is connected with the training algorithm module via A/D converter, and described predistorter is connected with the input of power amplifier via frequency mixer.Adopt the analog predistortion technology of digital simulation combination, the comprehensive advantage of integrated simulation and digital method.Because the requirement for the sample rate of A/D obviously reduces, thereby the realizability and the manufacturing cost of system have been improved.
Of the present utility model have a high conforming multichannel radio circuit, described AGC control unit comprises voltage control Amplifier VGA, amplifier, band pass filter, the power splitter that input signal is handled successively, an output output of described power splitter regular path signal, the signal of another output output is input to the control end of voltage control Amplifier VGA after wave detector and amplifier processing.Voltage control Amplifier VGA, amplifier, the band pass filter receipts Signal Processing that achieves a butt joint, and by power splitter output, wave detector and amplifier help the stability of output signal more because it has constituted a closed loop.
Of the present utility model have a high conforming multichannel radio circuit, and local vibration source comprises the reference source be made up of the constant-temperature crystal oscillator of low phase noise, high stability and the voltage controlled oscillator of low phase noise.Employing is helped forming the local vibration source of high stable by the voltage controlled oscillator of the constant-temperature crystal oscillator of low phase noise, high stability and low phase noise.
Of the present utility model have a high conforming multichannel radio circuit, also comprises transmit power control module and calibrate module.Transmit power control module is owing to control the transmitting power of the processing unit that transmits.
Of the present utility model have a high conforming multichannel radio circuit, and the number of described wide band radio-frequency Transmit-Receive Unit is 1～9.Adopt more passage and adopt orthogonal frequency division multiplexi, help guaranteeing that radio circuit has higher bandwidth.
Of the present utility model have a high conforming multichannel radio circuit, and the frequency of the described processing unit that transmits (5) input signal is 80MHz, and the rectified signal of described received signal processing unit output is 140MHz; The signal frequency that described local vibration source is input in the frequency mixer in transmit processing unit and the received signal processing unit is respectively 2.32GHz and 2.26GHz.
The beneficial effects of the utility model are: the utility model is by the mode of the processing unit that transmits, received signal processing unit and other Channel Sharing local vibration source signals, solved communication system effectively to very strict problems of parameter request such as the frequency stability of local vibration source signal, phase noise, channel consistency, the signal that makes modulation and demodulation go out has consistent gain, the linearity; The power amplifier in the processing unit of transmitting adopts the analog predistortion technology of digital simulation combination, can accomplish amplitude and phase predistortion accurately in the bandwidth range of broad; The utility model has been realized the wideband transmit and the reception of analog signal by a plurality of wide band radio-frequency Transmit-Receive Units being set and adopting the OFDM technology.
Description of drawings
Fig. 1 is circuit theory diagrams of the present utility model;
Fig. 2 is the schematic diagram of wide band radio-frequency Transmit-Receive Unit in the utility model;
Fig. 3 is the schematic diagram of simulated pre-distortion circuit in the utility model;
Among the figure: 1 local vibration source, 2 wide band radio-frequency Transmit-Receive Units, 3 dual-mode antenna systems, 4 AGC control units, 5 processing units that transmit, 6 received signal processing units, 7 transmit power control modules, 8 calibrate modules, 9 coupling circuits, 10 frequency mixers, 11 demodulators, 12 A/D converters, 13 training algorithm modules, 14 predistorters, 15 frequency mixers.
Embodiment
The utility model is described in further detail below in conjunction with accompanying drawing and embodiment.
In the multichannel radio circuit, require noise factor as much as possible little.Total noise factor of concatenation system is:
In the formula, NF is a noise factor, and G is gain.As seen, what noise factor of front is to the systematic influence maximum.Be to reduce the noise factor of concatenation system, must reduce the noise factor of first, second grade and suitably improve their power gain, with the influence of the noise that reduces subsequent stages system.Therefore being easy to adopt distribution to decline is with match circuit to come design circuit, select the microwave-medium substrate of suitable dielectric constant, low differential loss to satisfy the needs that microstrip circuit designs simultaneously, prime LNA coupling is based on the noise coupling, to obtain best noiseproof feature in the circuit design.The ferrite isolator spare that the LNA input adds low differential loss guarantees its input standing wave performance, improves the stability of LNA circuit.
As depicted in figs. 1 and 2, provided the schematic diagram of schematic diagram of the present utility model and wide band radio-frequency Transmit-Receive Unit respectively, it comprises local vibration source 1, wide band radio-frequency Transmit-Receive Unit 2, dual-mode antenna system 3, AGC control unit 4, the processing unit 5 that transmits, received signal processing unit 6, transmit power control module 7, calibrate module 8; Local vibration source 1 is used to produce the high-frequency signal of frequency adjustable, and the signal of different frequency is input in the frequency mixer in transmit processing unit 5 and the received signal processing unit 6, so that realize corresponding modulation and demodulation function.The baseband modulation signal frequency of the processing unit that transmits input is the analog signal of 80MHz, and be input in the intermediate frequency amplifier, and then advanced numerical-control attenuator, band pass filter, frequency mixer, band pass filter, power amplifier successively and handled accordingly, frequency mixer is used to realize the addition of the high-frequency signal about 2.32GHz that baseband signal and local vibration source send, and the band pass filter that is arranged on the frequency mixer rear and front end is used to filter the outer impurity signal of corresponding band; Through after the processing of power amplifier again by circulator and the band pass filter line output of going forward side by side.Circulator is realized received signal and the isolation that transmits, and realizes the duplex transmitting-receiving of signal.Dual-mode antenna system 3 is connected with each wide band radio-frequency Transmit-Receive Unit 2, is used for transmitting and receiving of high-frequency signal.Like this by the processing unit 5 that transmits, analog source, dual-mode antenna system 3 in local vibration source 1, the wide band radio-frequency Transmit-Receive Unit 2, and, realized the output of 2.4GHz analog signal by the baseband signal of 80MHz and the mixing of 2.32GHz carrier signal.
Received signal processing unit 6 in the shown wide band radio-frequency Transmit-Receive Unit 2 comprises successively analog radio frequency switch, two low noise amplifiers, band pass filter, frequency mixer, band pass filter, amplifier and AGC control units that the signal of the output output of circulator received signal is handled; Frequency mixer is used to realize that the high-frequency signal of the 2.26GHz that the 2.4GHz signal that receives and local vibration source 1 send carries out mixing, and produces the intermediate-freuqncy signal of 140MHz, is handling back output through corresponding.The AGC control unit comprises voltage control Amplifier VGA, amplifier, band pass filter, power splitter, an output output of this power splitter regular path signal, the signal of another output output is input to the control end of voltage control Amplifier VGA after wave detector and amplifier processing.And then realized control, and realized the consistency of gain to receiving gain in each loop.To be power splitter with path signal be coupled out AGC control unit operation principle gives wave detector and carry out detection, by amplifier detecting circuit is adjusted to suitable scope, the multiplication factor of control VGA to intermediate-freuqncy signal, intermediate-freuqncy signal with the output stable level, AGC loop level adjusting range is wide 〉=50dB, has stable amplitude output characteristic, well the linear detection performance.
As shown in Figure 2, provided the circuit theory diagrams of the middle simulated pre-distortion circuit of the power amplifier in the processing unit 5 that transmits, it comprises coupling circuit 9, frequency mixer 10, demodulator 11, A/D converter 12, training algorithm module 13, predistorter 14, frequency mixer 15; Coupling circuit 9 is arranged on the output of power amplifier, is used for the high-frequency signal of output is coupled, and the high-frequency signal that is coupled out carries out mixing through the signal that frequency mixer 10 and local vibration source 1 send, so that reduce the frequency of signal; And then process demodulator 11 carries out demodulation, and then be converted into the analog signal that is close to zero, be input to successively in training algorithm module 13, the predistorter 14 after advancing the conversion of A/D converter 12 again, be input to the input port of power amplifier at last behind the signal mixing that sends via frequency mixer 15 and local vibration source 1.Simulated pre-distortion circuit adopts the analog predistortion technology of digital simulation combination, the comprehensive advantage of integrated simulation and digital method.Be with the difference of commonly used digital pre-distortion: directly feedback signal is not sampled, but will under frequency conversion fall behind the intermediate frequency, again this signal is carried out demodulation, be input at last in the middle of the training algorithm module.Because the requirement for the sample rate of A/D obviously reduces, thereby the realizability and the manufacturing cost of system have been improved.Owing to carry out predistortion on intermediate frequency, so this method not only can comprise the non-linear of the Cheng Sheng of power amplifier institute, also can comprise the nonlinear problem in the frequency mixer simultaneously.Therefore, this predistortion is taken all factors into consideration the main non-linear partial on the radio frequency link, and then has improved the linearity on the whole channel, reduces the influence that radio frequency path brings systemic the subject of knowledge and the object of knowledge.
Claims (9)
1. one kind has high conforming multichannel radio circuit, comprise the local vibration source (1) that is used to produce at least two kinds of high-frequency signals, be used for modulating and carry out some wide band radio-frequency Transmit-Receive Units (2) of demodulation to received signal and be used for that signal receives and the dual-mode antenna system (3) of emission that it is characterized in that: described wide band radio-frequency Transmit-Receive Unit (2) comprises processing unit that transmits (5) and received signal processing unit (6) to transmitting; All comprising frequency mixer and corresponding frequency mixer in described transmit processing unit and the received signal processing unit is connected with the high-frequency signal of the different frequency of local vibration source (1) output respectively.
2. according to claim 1 have a high conforming multichannel radio circuit, it is characterized in that: the described processing unit that transmits (5) comprises intermediate frequency amplifier, numerical-control attenuator, band pass filter, frequency mixer, band pass filter, the power amplifier that the baseband signal of input is handled successively; The output of described power amplifier is connected with circulator, and this circulator is connected with dual-mode antenna system (3) via band pass filter.
3. according to claim 2 have a high conforming multichannel radio circuit, it is characterized in that: described received signal processing unit (6) comprises being received by antenna, and analog radio frequency switch, two low noise amplifiers, band pass filter, frequency mixer, band pass filter, amplifier and AGC control units (4) of handling successively through the signal to be demodulated of circulator output.
4. according to claim 2 have a high conforming multichannel radio circuit, it is characterized in that: described power amplifier is high linear power amplifier, it comprises simulated pre-distortion circuit, and this simulated pre-distortion circuit comprises and is used for the coupling circuit (9) that the high-frequency signal of power amplifier output is taken a sample, demodulator (11), training algorithm module (13) and the predistorter (14) that is used for high-frequency signal is carried out down-conversion; The output of described coupling circuit is connected with the input of demodulator via frequency mixer (10), and described demodulator is connected with the training algorithm module via A/D converter (12), and described predistorter is connected with the input of power amplifier via frequency mixer (15).
5. according to claim 3 have a high conforming multichannel radio circuit, it is characterized in that: described AGC control unit (4) comprises voltage control Amplifier VGA, amplifier, band pass filter, the power splitter that input signal is handled successively, an output output of described power splitter regular path signal, the signal of another output output is input to the control end of voltage control Amplifier VGA after wave detector and amplifier processing.
6. according to claim 1 and 2 have a high conforming multichannel radio circuit, it is characterized in that: local vibration source comprises the reference source be made up of the constant-temperature crystal oscillator of low phase noise, high stability and the voltage controlled oscillator of low phase noise.
7. according to claim 1 and 2 have a high conforming multichannel radio circuit, it is characterized in that: also comprise transmit power control module (7) and calibrate module (8).
8. according to claim 1 and 2 have a high conforming multichannel radio circuit, and it is characterized in that: the number of described wide band radio-frequency Transmit-Receive Unit (2) is 1～9.
9. according to claim 1 and 2 have a high conforming multichannel radio circuit, it is characterized in that: the frequency of the described processing unit that transmits (5) input signal is 80MHz, and the rectified signal of described received signal processing unit (6) output is 140MHz; The signal frequency that described local vibration source (1) is input in the frequency mixer in processing unit that transmits (5) and the received signal processing unit (6) is respectively 2.32GHz and 2.26GHz.
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| CN102624438A (en) * | 2011-12-15 | 2012-08-01 | 上海卫星工程研究所 | Satellite Data Collection Receiver |
| CN102647188A (en) * | 2012-04-27 | 2012-08-22 | 宁波大学 | A multi-band multi-mode radio frequency power amplifier nonlinear characteristic extraction device |
| CN102694550A (en) * | 2012-05-18 | 2012-09-26 | 宁波大学 | Nonlinearity extractor of ultra-wideband radio-frequency power amplifier |
| CN103095318A (en) * | 2013-01-17 | 2013-05-08 | 陕西北斗恒通信息科技有限公司 | Anti-interference radio-frequency receiving system |
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