CN106162005B - Television demodulator and its bearing calibration with output calibration function - Google Patents
Television demodulator and its bearing calibration with output calibration function Download PDFInfo
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- CN106162005B CN106162005B CN201510135109.0A CN201510135109A CN106162005B CN 106162005 B CN106162005 B CN 106162005B CN 201510135109 A CN201510135109 A CN 201510135109A CN 106162005 B CN106162005 B CN 106162005B
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Abstract
The present invention proposes a kind of television demodulator with output calibration function, includes: Television Digital to analog converter and correcting circuit.Television Digital to analog converter includes: master switch, is controlled by a correctiong signal and generates a principal current；Current dividing circuit distributes the principal current to generate a simulation output signal in an output end；First switch is electrically connected between current dividing circuit and first resistor；Second switch is electrically connected between current dividing circuit and second resistance.Correcting circuit controls the master switch according to the simulation output signal or its related signal, to generate the correctiong signal, with the feedback control principal current.The bearing calibration with the television demodulator of output calibration function is also proposed simultaneously.
Description
Technical field
The present invention relates to a kind of television demodulator with output calibration function and its bearing calibrations, particularly relate to a kind of energy
Television demodulator and its bearing calibration with output calibration function.
Background technique
In the television demodulator of the prior art, output signal may be influenced by the resistance of back-end circuit.In order to
Accurate output signal can be generated, the prior art can match the impedance of television line using external plug-in resistance, with
Reach this purpose.
However, the impedance of television line be it is unknown, plug-in resistance may not be able to match television line just
Impedance so that correct output signal cannot be generated, such as may cause the shortcomings that color is discontented with rank or other problems.
Patent involved in the prior art relevant to this case sees United States Patent (USP) case the 8,767,129th, the 7th,
No. 352,238 and No. 4,544,911.
In view of this, the present invention is i.e. in view of the above shortcomings of the prior art, a kind of electricity with output calibration function is proposed
Depending on demodulator and its bearing calibration, correct output signal can be generated to solve in the case where unknown television transmission line impedence
Foregoing problems.In addition, increasing the application of product the present invention can provide high quality or low power consumption both of which.
Summary of the invention
It is an object of the invention to overcome the deficiencies in the prior art and defect, propose a kind of electricity with output calibration function
Depending on demodulator and its bearing calibration, correct output signal can be generated to solve in the case where unknown television transmission line impedence
Problem of the prior art.In addition, increasing the application of product the present invention can provide high quality or low power consumption both of which.
In order to achieve the above object, just wherein a viewpoint says that the present invention provides a kind of TV solutions with output calibration function
Device is adjusted, includes: a Television Digital to analog converter (TV digital-to-analog converter, TV DAC), comprising:
One master switch, one end are coupled to a preset potential, and are controlled by a correctiong signal, when the master switch is controlled by the correction
Signal and when being connected, generate a principal current；One current dividing circuit is coupled with the master switch, and is controlled by image control
Signal to determine how the principal current distributes, and then generates a simulation output signal in an output end of the television demodulator；That
This concatenated first switch and a first resistor, the first switch and the current dividing circuit couple and with the output end coupling
It connects；And the second switch being one another in series and a second resistance, the second switch and the current dividing circuit couple；And one
Correcting circuit is coupled with the output end and the master switch, is interrogated according to the simulation output signal or its correlation, to generate the correction
Signal controls the master switch, with the feedback control principal current.
Preferably implement in kenel a kind of, under the mode of a voltage output, the first switch and the second switch are all
For conducting, thus the television demodulator provides the simulation output signal of corrected voltage form.
Preferably implement in kenel a kind of, under the mode of electric current transmitting, the first switch and the second switch are all
For open circuit, thus the television demodulator provides the simulation output signal of current forms.
Preferably implement in kenel a kind of, which includes: a comparator, compare the simulation output signal or its
Related signal and a reference voltage, to generate a comparison result；And one control circuit the school generated according to the comparison result
Positive signal.
Preferably implement in kenel a kind of, which includes: an error amplifier, compares the simulation output signal
Or its related signal and a reference voltage, to generate the correctiong signal.
Preferably implement in kenel a kind of, Television Digital to analog converter and correcting circuit are to be incorporated into single integrate
Within circuit, and the first resistor and the second resistance are all set to the inside of the integrated circuit.
In order to achieve the above object, sayed with regard to another viewpoint, the present invention provides a kind of bearing calibration of television demodulator, comprising with
Lower step: a Television Digital is provided to analog converter, the Television Digital to analog converter passes through a current dividing circuit point
With a principal current, and determine a simulation output signal；The first switch that is one another in series and a first resistor are provided, this first is opened
It closes with current dividing circuit coupling and is coupled with the output end；The second switch being one another in series and a second resistance are provided,
The second switch and the current dividing circuit couple；And according to the simulation output signal, the feedback control principal current.
Below by specific embodiment elaborate, when be easier to understand the purpose of the present invention, technology contents, feature and its
The effect of reached.
Detailed description of the invention
Fig. 1 shows the function block schematic diagram of the television demodulator with output calibration function of one embodiment of the invention；
Fig. 2 shows a more specific embodiment of Television Digital of the invention to analog converter (TV DAC)；
Fig. 3 A shows an embodiment of correcting circuit of the invention；
Fig. 3 B shows another embodiment of correcting circuit of the invention；
Fig. 4 shows another embodiment of master switch of the invention；
Fig. 5 shows another embodiment of the first electric current distribution switch and the second electric current distribution switch of the invention.
Symbol description in figure
20 television demodulators
21 Television Digitals are to analog converter
212 master switches
213 current dividing circuits
2131 first electric currents distribution switch
2132 second electric currents distribution switch
22 correcting circuits
223 comparators
224 control circuits
AO simulation output signal
CS correctiong signal
EA error amplifier
I principal current
IS image controls signal
IS1 (image controls signal) sub- signal
IS2 (image controls signal) sub- signal
OUT output end
R1 first resistor
R2 second resistance
S4 (comparator) output signal
Vctrl1 first switch
Vctrl2 second switch
VDD supplies power supply
Vref reference voltage
Specific embodiment
For the present invention aforementioned and other technology contents, feature and effect, it is following cooperation with reference to schema one preferably
In the detailed description of embodiment, can clearly it present.Schema in the present invention belongs to signal, be mostly intended to indicate each device with
And the function relationship between each element, it then and not according to ratio is drawn as shape, thickness and width.
Referring to FIG. 1, the function side of its television demodulator with output calibration function for showing one embodiment of the invention
Block schematic diagram.The television demodulator 20 with output calibration function of the present embodiment includes a Television Digital to analog converter
(TV digital-to-analog converter, TVDAC) 21 and correcting circuit 22.Correcting circuit 22 is according to simulation
Output signal AO or its related signal (such as simulation output signal AO itself or its ratio value) generate correctiong signal CS, control
Whether Television Digital to analog converter 21 generates signal, and simulation caused by correcting TV digital to analog converter 21 is defeated
Signal AO out.When correctiong signal CS, which enables Television Digital, generates signal to analog converter 21, Television Digital to analog-converted
Device 21 is controlled by image control signal IS, and generates simulation output signal AO in output end OUT.Image controls signal IS
The signal of multidigit, digit is higher, then higher (that is, simulation output signal AO can have more multidigit rank to the resolution ratio of integrated circuit
Variation).Output end OUT can be external to a such as, but not limited to television image generation circuit.Wherein, external TV for example but
It is not limited to be a DTV (digital TV, DTV) or a traditional analog television (analog TV, ATV).
In detail, Television Digital to analog converter 21 includes a master switch 212, a current dividing circuit 213,1 the
An one switch Vctrl1 and second switch Vctrl2.Master switch 212 is coupled to a suitable preset potential, such as, but not limited to
Supply power vd D.Master switch 212 is controlled by correctiong signal CS；It is connected when master switch 212 is controlled by correctiong signal CS
When, generate a principal current I.Current dividing circuit 213 and master switch 212 couple, and are controlled by image control signal IS.Electric current
Distributor circuit 213 controls signal IS according to image, determines how principal current I distributes, that is, determines simulation output signal AO.Electric current
Distributor circuit 213 is electrically connected to first resistor R1 through first switch Vctrl1；First resistor R1 is not electrically connected to first switch
The other end of Vctrl1 be connected to one known to current potential, such as be grounded.First switch Vctrl1 and output end OUT is coupled.Electric current
Distributor circuit 213 is electrically connected to second resistance R2 through second switch Vctrl2 again；Second resistance R2 is not electrically connected to first and opens
Close Vctrl1 the other end be connected to one known to current potential, such as be grounded.In the preferred embodiment, Television Digital is to analog-converted
Device 21 and correcting circuit 22 are to be incorporated within single IC for both, and first resistor R1 and second resistance R2 are all set to the collection
At the inside of circuit.
In the present invention, due to controlling master switch 212 with correctiong signal CS, it can control the size of electric current I.Also
I.e., it is possible to according to simulation output signal AO come the size of feedback control electric current I, and then simulation output signal AO feedback control is existed
Accurate numerical value.
Referring to FIG. 2, it shows a more specific embodiment of Television Digital of the invention to analog converter (TV DAC).
In the present embodiment, master switch 212 such as, but not limited to can be a PMOS power transistor switch, as shown in Figure 2.In other
In embodiment, master switch 212 such as, but not limited to can be a NMOS power transistor switch, as shown in Figure 4.In the present embodiment
In, current dividing circuit 213 includes that the one first electric current distribution switch 2131 being connected in parallel to each other and the distribution of one second electric current switch
2132.In the present embodiment, the first electric current distribution switch 2131 and the second electric current distribution switch 2132 such as, but not limited to can be
PMOS power transistor switch, as shown in Figure 2.In other embodiments, the first electric current distributes switch 2131 and the second electric current point
It such as, but not limited to can be NMOS power transistor switch with switch 2132, as shown in Figure 5.In the present embodiment, image controls
Signal IS includes sub- signal IS1 and IS2, controls the first electric current distribution switch 2131 and the second electric current distribution switch 2132 respectively；
Sub- signal IS1 is reverse phase signal or complementary signal with IS2 each other.
Please refer to Fig. 3 A and Fig. 3 B.Fig. 3 A shows an embodiment of correcting circuit of the invention.Fig. 3 B shows of the invention
Another embodiment of correcting circuit.
As shown in Figure 3A, in an embodiment, correcting circuit 22 may include a comparator 223 and a control circuit 224.Than
One of input terminal compared with device 223 receive simulation output signal AO or its related signal (such as simulation output signal AO itself or its
Ratio value), another input terminal receives reference voltage Vref.The output end and control circuit 224 of comparator 223 couple；Control electricity
Road 224 generates correctiong signal CS according to the output signal S4 of comparator 223.When simulation output signal AO is too low, then news are corrected
Number CS controls master switch 212, and principal current I is turned up；When simulation output signal AO is excessively high, then correctiong signal CS controls master control and opens
212 are closed, principal current I is turned down.In this way, the mechanism controlled by circuit feedback, can control simulation output signal AO desired
Target value (corresponds to reference voltage Vref).Reference voltage Vref can be an adjustable numerical value.
As shown in Figure 3B, in another embodiment, correcting circuit 22 can only include an error amplifier EA.Error amplifier
One of EA input terminal receives simulation output signal AO or its related signal (such as simulation output signal AO itself or its ratio value),
Another input terminal receives reference voltage Vref.Error amplifier EA is by simulation output signal AO or its related signal and reference voltage
Vref mutually compares, and control signal CS is generated, to control the operation of master switch 212.When simulation output signal AO is too low, then
Correctiong signal CS controls master switch 212, and principal current I is turned up；When simulation output signal AO is excessively high, then correctiong signal CS is controlled
Master switch 212 turns down principal current I.In this way, the mechanism controlled by circuit feedback, can control simulation output signal AO
Desired target value (corresponding to reference voltage Vref).Reference voltage Vref can be an adjustable numerical value.
The present invention can operate in different modes by control first switch Vctrl1 and second switch Vctrl2.
In one embodiment, when the television demodulator 20 with output calibration function is under the mode of a voltage output, the present invention can pacify
Row makes first switch Vctrl1 and second switch Vctrl2 is all conducting.In the case, referring to Fig.2, simulation output signal AO
It is a voltage signal, equal to the product of the electric current and resistance R1 that flow through resistance R1.In this mode, the present invention can be provided precisely
Simulation output signal AO.
In another embodiment, when the television demodulator 20 with output calibration function is under the mode that an electric current exports,
The present invention can arrange to make first switch Vctrl1 and second switch Vctrl2 is all open circuit.In the case, referring to Fig.2, simulation
Output signal AO is a current signal, and numerical value is depending on sub- signal IS1 and IS2.For example, when reception simulation output news
The back-end circuit of number AO, do not need accurately signal or can self calibration when, so that it may this mode is used, in this mould
In formula, the present invention can reach low power consumption.Plug-in resistance in the prior art, have no first switch Vctrl1 and second switch
Vctrl2, therefore current flowing resistance R1 and R2 are had, cause unnecessary power consumption.In the present invention, due to first switch
Vctrl1 and second switch Vctrl2 is open circuit, therefore does not have current flowing resistance R1 and R2, can save power consumption.According to experiment
As a result, 50% power consumption can be saved.
Illustrate the present invention for preferred embodiment above, it is only described above, only make those skilled in the art easy
In the understanding contents of the present invention, interest field not for the purpose of limiting the invention.Under same spirit of the invention, this field skill
Art personnel can think and various equivalence changes.For example, can be inserted into does not influence signal major significance in shown each embodiment circuit
Element, such as other switches；In another example the input terminal sign of error amplifier or comparator can be interchanged, it only need to be in electricity
Corresponding modification etc. is made in road.All this kind according to the present invention can all teach and analogize and obtain, and therefore, the scope of the present invention is answered
Cover above and other all equivalence changes.In addition, any embodiment of the invention necessarily reaches all purpose or advantage,
Therefore, any of claim also should not be as limit.
Claims (7)
1. a kind of television demodulator with output calibration function, characterized by comprising:
One Television Digital is to analog converter, comprising:
One master switch, one end are coupled to a preset potential, and are controlled by a correctiong signal, when the master switch is controlled by this
Correctiong signal and when being connected, generate a principal current；
One current dividing circuit is coupled with the master switch, and is controlled by image control signal, how to determine the principal current
Distribution, and then a simulation output signal is generated in an output end of the television demodulator；
The first switch and a first resistor being one another in series, the first switch are with current dividing circuit coupling and defeated with this
Outlet coupling, one end which does not connect with the first switch is connected to a known potential；And
The second switch being one another in series and a second resistance, the second switch and the current dividing circuit couple, second electricity
It hinders the one end not connecting with the first switch and is connected to a known potential；And
One correcting circuit is coupled with the output end and the master switch, according to the simulation output signal or its related signal, to produce
The raw correctiong signal controls the master switch, with the feedback control principal current；
Wherein, which includes one of following configuration；
(1) one comparator compares the simulation output signal or its related signal and a reference voltage, to generate a comparison result；
And
One control circuit generates the correctiong signal according to the comparison result；Or
(2) one error amplifiers compare the simulation output signal or its related signal and a reference voltage, to generate correction news
Number.
2. as described in claim 1 with the television demodulator of output calibration function, wherein in the mode of a voltage output
Under, the first switch and the second switch are all conducting, and thus the television demodulator provides being somebody's turn to do for corrected voltage form
Simulation output signal.
3. as described in claim 1 with the television demodulator of output calibration function, wherein in the mode of electric current transmitting
Under, the first switch and the second switch are all open circuit, and thus the television demodulator provides the simulation output news of current forms
Number.
4. as described in claim 1 with the television demodulator of output calibration function, wherein Television Digital to analog converter
It is to be incorporated within single IC for both, and the first resistor and the second resistance are all set to the integrated circuit with correcting circuit
Inside.
5. a kind of bearing calibration of television demodulator, which is characterized in that comprise the steps of:
(A) master switch is provided, when the master switch is controlled by a correctiong signal and is connected, generates a principal current, and, it mentions
For a Television Digital to analog converter, the Television Digital to analog converter distributes the main electricity by a current dividing circuit
Stream, and determine a simulation output signal；
(B) first switch that is one another in series and a first resistor be provided, the first switch and the current dividing circuit couple and
It is coupled with an output end of the television demodulator；
(C) second switch being one another in series and a second resistance are provided, the second switch and the current dividing circuit couple；With
And
(D) according to the simulation output signal, the master switch is controlled to generate the correctiong signal, uses the feedback control main electricity
Stream；
Wherein, the step of generating the correctiong signal one of includes the following steps:
(1) compare the simulation output signal and a reference voltage, to generate a comparison result；And
According to the comparison result, the correctiong signal is generated；Or
(2) compare the simulation output signal and a reference voltage, to generate the correctiong signal.
6. bearing calibration as claimed in claim 5, wherein further include: under the mode of a voltage output, this is connected and first opens
Pass and the second switch, thus the television demodulator provides the simulation output signal of corrected voltage form.
7. bearing calibration as claimed in claim 5, wherein further include: under the mode of electric current transmitting, make the first switch
It is all open circuit with the second switch, the television demodulator provides the simulation output signal of current forms whereby.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510135109.0A CN106162005B (en) | 2015-03-26 | 2015-03-26 | Television demodulator and its bearing calibration with output calibration function |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510135109.0A CN106162005B (en) | 2015-03-26 | 2015-03-26 | Television demodulator and its bearing calibration with output calibration function |
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| Publication Number | Publication Date |
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| CN106162005A CN106162005A (en) | 2016-11-23 |
| CN106162005B true CN106162005B (en) | 2019-06-04 |
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| CN201510135109.0A Active CN106162005B (en) | 2015-03-26 | 2015-03-26 | Television demodulator and its bearing calibration with output calibration function |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW201103326A (en) * | 2009-07-09 | 2011-01-16 | Mstar Semiconductor Inc | System and method for calibrating output of a demodulator and TV receiver |
| CN103428452A (en) * | 2012-05-25 | 2013-12-04 | 张镇非 | Modem for cable TV system |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4588033B2 (en) * | 2004-11-12 | 2010-11-24 | パナソニック株式会社 | Circuit module for digital television receiver |
| US7352238B2 (en) * | 2006-06-21 | 2008-04-01 | Newport Media, Inc. | dB-linear analog variable gain amplifier (VGA) realization system and method |
| US7782128B2 (en) * | 2006-07-28 | 2010-08-24 | Mstar Semiconductor, Inc. | Sign detection device and associated method |
-
2015
- 2015-03-26 CN CN201510135109.0A patent/CN106162005B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW201103326A (en) * | 2009-07-09 | 2011-01-16 | Mstar Semiconductor Inc | System and method for calibrating output of a demodulator and TV receiver |
| CN103428452A (en) * | 2012-05-25 | 2013-12-04 | 张镇非 | Modem for cable TV system |
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| CN106162005A (en) | 2016-11-23 |
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