CN101990056A - High-frequency compensation circuit of television brightness channel - Google Patents
High-frequency compensation circuit of television brightness channel Download PDFInfo
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- CN101990056A CN101990056A CN2009101095205A CN200910109520A CN101990056A CN 101990056 A CN101990056 A CN 101990056A CN 2009101095205 A CN2009101095205 A CN 2009101095205A CN 200910109520 A CN200910109520 A CN 200910109520A CN 101990056 A CN101990056 A CN 101990056A
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- 230000000149 penetrating effect Effects 0.000 claims description 20
- 230000008878 coupling Effects 0.000 claims description 3
- 238000010168 coupling process Methods 0.000 claims description 3
- 238000005859 coupling reaction Methods 0.000 claims description 3
- 238000003780 insertion Methods 0.000 claims description 3
- 230000037431 insertion Effects 0.000 claims description 3
- 239000003990 capacitor Substances 0.000 abstract description 9
- 238000001514 detection method Methods 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
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- 238000010897 surface acoustic wave method Methods 0.000 description 1
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Abstract
In order to solve the technical problems that signal processing channels of the conventional television and other video demodulation equipment have high high-frequency loss and are difficult to pass linear waveform response test, the invention provides a high-frequency compensation circuit of a television brightness channel. The high-frequency compensation circuit is connected with the output end of a television signal from radio-frequency demodulation to video, the high-frequency compensation circuit is a first emitter follower circuit, the base of the first emitter follower circuit is a signal input end which is connected with the output end of the television signal from the radio-frequency demodulation to the video, the emitter of the first emitter follower circuit is a signal output end, a first capacitor is connected between the emitter of the first emitter follower circuit and a grounded end, and a second capacitor is connected between the emitter and the base of the first emitter follower circuit. The high-frequency compensation circuit has the advantages that: by inserting the high-frequency compensation circuit of the emitter follower circuit, the high-frequency components of compensated video signals are unified so as to meet the national standard detection requirement of linear waveform response passing through the brightness channel and improve the quality of television images.
Description
Technical field
The present invention relates to a kind of video output or video amplifier stage circuit of the signal processing channel that is used for television set and other video demodulator equipment, relate to a kind of grade follower high frequency compensation of penetrating of the linear waveform response test by the TV brightness passage particularly.
Background technology
In the national standard and company standard of TV production industry, the linear waveform response of luminance channel is that the gauge signal passage is to the major criterion of radiofrequency signal to vision signal demodulation quality quality, because the high frequency of signal processing channel, intermediate frequency, video section all may produce amplitude-frequency characteristic and cause high frequency distortion inadequately well, in the processing procedure of TV signal from the radio frequency to the video, comprise the high frequency demodulation, intermediate frequency amplifies, bandpass filtering, intermediate frequency demodulation, video amplifies several sections, the attenuation degree of the high fdrequency component of the vision signal that demodulation is come out depends on the quality of the amplitude-versus-frequency curve of above each processing procedure circuit, just the quality of high frequency response.Owing to handle the tuner of high frequency demodulation, handle the Surface Acoustic Wave Filter of bandpass filtering, the integrated circuit of intermediate frequency demodulation, the transistor circuit that intermediate frequency amplifies and video amplifies, all more or less there is the high fdrequency component loss, is difficult at present the high frequency response of above each part is accomplished ideal.If the high-frequency loss of one of them is big, perhaps each part high-frequency loss add up bigger, the national standard of linear waveform response that all can not be by luminance channel, this is present TV producer's ubiquity and the technical problem that needs to be resolved hurrily.
Summary of the invention
The present invention is for solving the problems of the technologies described above, and a kind of grade follower high frequency compensation of penetrating of linear waveform response test that can be by the TV brightness passage is provided.
The present invention realizes that the technical scheme that goal of the invention adopts is, a kind of high frequency compensation of TV brightness passage, connect the output of TV signal after from the radio demodulating to the video, it is characterized in that: described high frequency compensation is first to penetrate a grade follower circuit, described first base stage of penetrating grade follower circuit is a signal input part, connect the output of described TV signal after from the radio demodulating to the video, described first emitter-base bandgap grading of penetrating grade follower circuit is a signal output part, described first penetrates between the emitter-base bandgap grading of grade follower circuit and the earth terminal and is connected with first electric capacity, and described first penetrates between the emitter-base bandgap grading of grade follower circuit and the base stage and be connected with second electric capacity.
Better, described first penetrates that grade follower circuit is also parallel to be provided with second and to penetrate a grade follower circuit, described second penetrates each extremely all corresponding connection of triode that grade follower circuit and described first is penetrated grade follower circuit, described second electric capacity connects and connects second base stage and the emitter-base bandgap grading of penetrating grade follower circuit simultaneously, and described first penetrates grade follower circuit and second penetrates the triode of grade follower circuit and only select one of them insertion.
Described first signal input part of penetrating grade follower circuit is provided with an electric capacity as the AC coupled end.
Described first signal input part of penetrating grade follower circuit is provided with a resistance as the direct-current coupling end.
Grade follower circuit is penetrated in first of described parallel setting and second feeder ear of penetrating grade follower circuit is provided with filter circuit.
The invention has the beneficial effects as follows, by inserting grade follower circuit high frequency compensation of penetrating of the present invention, unified the high fdrequency component of compensation vision signal, thereby reached national standard detection requirement, improved quality of TV image by the linear waveform response of luminance channel.
Description of drawings
Fig. 1, embodiment 1 circuit diagram.
Fig. 2, embodiment 2 circuit diagrams.
Embodiment
Embodiment 1
Referring to accompanying drawing 1, a kind of high frequency compensation of TV brightness passage, connect the output of TV signal after from the radio demodulating to the video, described high frequency compensation is with 5V direct current supply, feeder ear is provided with the filter circuit of capacitor C 330, C331, C332 composition, described high frequency compensation comprises penetrates a grade follower circuit, described base stage of penetrating grade follower circuit is a signal input part, connect the output of described TV signal after from the radio demodulating to the video, the described emitter-base bandgap grading of penetrating grade follower circuit is a signal output part.Be provided with C333 as the AC coupled end at described signal input part, the described grade follower circuit triode of penetrating is selected 2SC9014 type straight cutting element V330, the base stage of triode V330 connects feeder ear by resistance R 321, by resistance R 322 ground connection, the collector electrode of triode V330 connects feeder ear by resistance R 323, the emitter-base bandgap grading of triode V330 is by resistance R 324 ground connection, by resistance R 325 as signal output part, be connected with first capacitor C 335 between the emitter-base bandgap grading of described triode V330 and the earth terminal, be connected with second capacitor C 334 between the emitter-base bandgap grading of described triode V330 and the base stage.
Can adjust the amplitude-versus-frequency curve of high frequency compensation by the capacitance of regulating C334 and C335, make compensation suitable, to increase the positive feedback of high-frequency signal, promote the high fdrequency component of output, thereby make the high fdrequency component of losing in the circuit at different levels of demodulation compensate again.By improvement of the present invention, can pass through the national standard test of the linear waveform response of luminance channel.
Referring to accompanying drawing 2, a kind of high frequency compensation of TV brightness passage, connect the output of TV signal after from the radio demodulating to the video, described high frequency compensation is with 5V direct current supply, feeder ear is provided with the filter circuit of capacitor C 330, C331, C332 composition, described high frequency compensation comprises that first penetrates a grade follower circuit, described first base stage of penetrating grade follower circuit is a signal input part, connect the output of described TV signal after from the radio demodulating to the video, described first emitter-base bandgap grading of penetrating grade follower circuit is a signal output part.Be provided with resistance R 320 as the direct-current coupling end at described signal input part, described first penetrates grade follower circuit triode selects MMBT3904 type paster triode V330, the base stage of triode V330 connects feeder ear by resistance R 321, by resistance R 322 ground connection, the collector electrode of triode V330 connects feeder ear by resistance R 323, the emitter-base bandgap grading of triode V330 is by resistance R 324 ground connection, by resistance R 325 as signal output part, be connected with first capacitor C 335 between the emitter-base bandgap grading of described triode V330 and the earth terminal, be connected with second capacitor C 334 between the emitter-base bandgap grading of described triode V330 and the base stage, described first penetrates that grade follower circuit is also parallel to be provided with second and to penetrate a grade follower circuit, described second penetrates a grade follower circuit selects MMBT3904 type paster triode V331 for use, each of triode V331 extremely all with respectively extremely corresponding connection of triode V330, the base stage of triode V331 and emitter-base bandgap grading are connected the two ends of second capacitor C 334 respectively, and the triode V331 that the described first triode V330 and second that penetrates grade follower circuit penetrates grade follower circuit only selects one of them insertion.
Present embodiment can be selected as required with MMBT3904 type paster triode or 2SC9014 type straight cutting triode, can adjust the amplitude-versus-frequency curve of high frequency compensation by the capacitance of regulating C334 and C335, make compensation suitable, to increase the positive feedback of high-frequency signal, promote the high fdrequency component of output, thereby make the high fdrequency component of losing in the circuit at different levels of demodulation compensate again.By improvement of the present invention, can pass through the national standard test of the linear waveform response of luminance channel.
It should be noted that at last: above embodiment only in order to the explanation the present invention and and unrestricted technical scheme described in the invention; Therefore, it will be understood by those of skill in the art that still and can make amendment or be equal to replacement the present invention although this specification has been described in detail the present invention with reference to each above-mentioned embodiment; And all do not break away from the technical scheme and the improvement thereof of the spirit and scope of the present invention, and it all should be encompassed in the claim scope of the present invention.
Claims (5)
1. the high frequency compensation of a TV brightness passage, connect the output of TV signal after from the radio demodulating to the video, it is characterized in that: described high frequency compensation is first to penetrate a grade follower circuit, described first base stage of penetrating grade follower circuit is a signal input part, connect the output of described TV signal after from the radio demodulating to the video, described first emitter-base bandgap grading of penetrating grade follower circuit is a signal output part, described first penetrates between the emitter-base bandgap grading of grade follower circuit and the earth terminal and is connected with first electric capacity, and described first penetrates between the emitter-base bandgap grading of grade follower circuit and the base stage and be connected with second electric capacity.
2. the high frequency compensation of a kind of TV brightness passage according to claim 1, it is characterized in that: described first penetrates that grade follower circuit is also parallel to be provided with second and to penetrate a grade follower circuit, described second penetrates each extremely all corresponding connection of triode that grade follower circuit and described first is penetrated grade follower circuit, described second electric capacity connects and connects second base stage and the emitter-base bandgap grading of penetrating grade follower circuit simultaneously, and described first penetrates grade follower circuit and second penetrates the triode of grade follower circuit and only select one of them insertion.
3. the high frequency compensation of a kind of TV brightness passage according to claim 1 and 2 is characterized in that: described first signal input part of penetrating grade follower circuit is provided with an electric capacity as the AC coupled end.
4. the high frequency compensation of a kind of TV brightness passage according to claim 1 and 2 is characterized in that: described first signal input part of penetrating grade follower circuit is provided with a resistance as the direct-current coupling end.
5. the high frequency compensation of a kind of TV brightness passage according to claim 2 is characterized in that: grade follower circuit is penetrated in first of described parallel setting and second feeder ear of penetrating grade follower circuit is provided with filter circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101095205A CN101990056A (en) | 2009-08-05 | 2009-08-05 | High-frequency compensation circuit of television brightness channel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101095205A CN101990056A (en) | 2009-08-05 | 2009-08-05 | High-frequency compensation circuit of television brightness channel |
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| Publication Number | Publication Date |
|---|---|
| CN101990056A true CN101990056A (en) | 2011-03-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009101095205A Pending CN101990056A (en) | 2009-08-05 | 2009-08-05 | High-frequency compensation circuit of television brightness channel |
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| CN (1) | CN101990056A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102412784A (en) * | 2011-11-30 | 2012-04-11 | 中国科学院微电子研究所 | Emitter follower and voltage controlled oscillator using same |
| CN103873742B (en) * | 2014-03-19 | 2017-03-29 | 成都引众数字设备有限公司 | For the compensation circuit of high-frequency video signal |
-
2009
- 2009-08-05 CN CN2009101095205A patent/CN101990056A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102412784A (en) * | 2011-11-30 | 2012-04-11 | 中国科学院微电子研究所 | Emitter follower and voltage controlled oscillator using same |
| CN102412784B (en) * | 2011-11-30 | 2014-05-14 | 中国科学院微电子研究所 | Emitter follower and voltage controlled oscillator using same |
| CN103873742B (en) * | 2014-03-19 | 2017-03-29 | 成都引众数字设备有限公司 | For the compensation circuit of high-frequency video signal |
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Application publication date: 20110323 |