CN101431636A - Television set tuner with clock output - Google Patents
Television set tuner with clock output Download PDFInfo
- Publication number
- CN101431636A CN101431636A CNA2008102179970A CN200810217997A CN101431636A CN 101431636 A CN101431636 A CN 101431636A CN A2008102179970 A CNA2008102179970 A CN A2008102179970A CN 200810217997 A CN200810217997 A CN 200810217997A CN 101431636 A CN101431636 A CN 101431636A
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- television set
- resistance
- set tuner
- electric capacity
- tuner
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- 239000013078 crystal Substances 0.000 claims abstract description 24
- 230000010355 oscillation Effects 0.000 claims abstract description 4
- 230000002093 peripheral effect Effects 0.000 abstract description 2
- 239000003990 capacitor Substances 0.000 description 9
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
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Abstract
The invention discloses a TV set tuner with clock out which solves problem of outputting a crystal oscillator clock signal of the TV set tuner to a peripheral circuit for saving resource and reducing cost. The invention uses a technical solution as follows: a TV set tuner with clock out including a TV set tuner is equipped with an decode chip in inside, the decode chip links with the crystal oscillator circuit, an oscillation signal of the crystal oscillator circuit is outputted through emitter follower circuit. Compared with the prior art, the TV set tuner outputs the clock signal in the tuner using the emitter follower for providing to external circuitry, the circuit board is compact, and can save resource and reduce cost.
Description
Technical field
The present invention relates to a kind of television set, particularly a kind of television set tuner.
Background technology
The inside crystal oscillator of the television set tuner of prior art provides oscillator signal only for the decoding chip of itself, and clock signal is provided often can not for outside other circuit, when outside other circuit uses clock signal, need finish this function by adding the clock signal module, not only outside the cost height, also be not suitable for using in the scheme of plate face compactness.
Summary of the invention
The object of the invention provides a kind of television set tuner with clock output, and the problem that solve is that the crystal oscillator clock signal with television set tuner outputs to peripheral circuit, reaches to save resource and reduce cost.
The present invention is by the following technical solutions: a kind of television set tuner with clock output, comprise television set tuner, be provided with decoding chip in the described television set tuner, decoding chip connects crystal oscillating circuit, and the oscillator signal of described crystal oscillating circuit is exported through emitter follower circuit.
Crystal oscillating circuit of the present invention is made of first electric capacity and the crystal resonator of the clock signal output pin that is connected decoding chip, crystal resonator other end ground connection.
The base stage of the triode of emitter follower circuit of the present invention connects the tie point of first electric capacity and crystal resonator, collector electrode connects the voltage output pin of decoding chip, emitting stage is connected the voltage output pin and second resistance between the ground, the 3rd resistance that connect decoding chip and provides quiescent point for transistor base to the external circuit clock signal.
The emitting stage of triode of the present invention through the 3rd electric capacity to the external circuit clock signal.
Be serially connected with first resistance and second electric capacity between the tie point of the base stage of triode of the present invention and first electric capacity and crystal resonator.
The transistor emitter of stating of the present invention is through the 4th grounding through resistance.
Decoding chip of the present invention adopts SN7616, output reference voltage is 0.4 volt, first resistance is 510 Ω-2K, and second resistance is 120K-150K, and the 3rd resistance is 150K-180K, the 4th resistance is 10K, first electric capacity is 15-30P, and second electric capacity is 1000P, and the 3rd electric capacity is 1000P, triode adopts 3904, and the frequency of oscillation of crystal resonator is 4M.
The present invention compared with prior art utilizes emitter follower with the output of tuner clock internal signal, for external circuit usefulness, and the circuit board compactness, thus reach the purpose of saving resource and reducing cost.
Description of drawings
Fig. 1 is a circuit diagram of the present invention.
Embodiment
The invention will be further described below in conjunction with accompanying drawing.
As shown in Figure 1, the television set tuner of band clock output of the present invention, in television set tuner, be provided with decoding chip, the clock signal output pin of decoding chip is through first capacitor C 1 and crystal resonator Y1 ground connection, described first capacitor C 1 and crystal resonator Y1 tie point are through second capacitor C 2, first resistance R 1 connects triode Q1 base stage, triode Q1 constitutes emitter follower, second capacitor C 2 and first resistance R 1 play buffer action, the collector electrode of described triode Q1 connects the voltage output pin of decoding chip, emitting stage through the 3rd capacitor C 3 to the external circuit clock signal, the 3rd capacitor C 3 plays every straight effect, the emitting stage of triode Q1 is also through the 4th resistance R 4 ground connection, second resistance R 2, the 3rd resistance R 3 obtains power supply from the voltage output pin of decoding chip, for triode Q1 base stage provides quiescent point, the output of described second resistance R 2 connects the voltage output pin of decoding chip, the other end ground connection of the 3rd resistance R 3.
As most preferred embodiment, decoding chip adopts SN7616, and output reference voltage is 0.4 volt, and first resistance R 1 is 510 Ω-2K, second resistance R 2 is 120K-150K, the 3rd resistance R 3 is 150K-180K, and the 4th resistance R 4 is 10K, and first capacitor C 1 is 15-30P, second capacitor C 2 is 1000P, the 3rd capacitor C 3 is 1000P, and triode Q1 adopts 3904, and the frequency of oscillation of crystal resonator Y1 is 4M.
The invention has the advantages that and to utilize the output of tuner internal clock signal, oscillator signal is drawn Come, for external circuit usefulness, one can reduce cost, and can save the periphery composing of another chip The circuit board face relatively is applicable in the very compact scheme of plate face.
Claims (7)
1. the television set tuner with clock output comprises television set tuner, is provided with decoding chip in the described television set tuner, and decoding chip connects crystal oscillating circuit, and it is characterized in that: the oscillator signal of described crystal oscillating circuit is exported through emitter follower circuit.
2. the television set tuner of band clock output according to claim 1 is characterized in that: described crystal oscillating circuit constitutes crystal resonator (Y1) other end ground connection by first electric capacity (C1) and the crystal resonator (Y1) of the clock signal output pin that is connected decoding chip.
3. the television set tuner of band clock output according to claim 2, it is characterized in that: the base stage of the triode of described emitter follower circuit (Q1) connects the tie point of first electric capacity (C1) and crystal resonator (Y1), collector electrode connects the voltage output pin of decoding chip, emitting stage is connected the voltage output pin and second resistance (R2) between the ground, the 3rd resistance (R3) that connect decoding chip and provides quiescent point for triode (Q1) base stage to the external circuit clock signal.
4. the television set tuner of band clock according to claim 3 output is characterized in that: the emitting stage of described triode (Q1) through the 3rd electric capacity (C3) to the external circuit clock signal.
5. the television set tuner of band clock output according to claim 4 is characterized in that: be serially connected with first resistance (R1) and second electric capacity (C2) between the tie point of the base stage of described triode (Q1) and first electric capacity (C1) and crystal resonator (Y1).
6. the television set tuner of band clock output according to claim 5, it is characterized in that: described triode (Q1) emitter is through the 4th resistance (R4) ground connection.
7. the television set tuner of band clock output according to claim 6, it is characterized in that: described decoding chip adopts SN7616, output reference voltage is the 0.4V volt, first resistance (R1) is 510 Ω-2K, second resistance (R2) is 120K-150K, the 3rd resistance (R3) is 150K-180K, the 4th resistance (R4) is 10K, first electric capacity (C1) is 15-30P, second electric capacity (C2) is 1000P, the 3rd electric capacity (C3) is 1000P, and triode (Q1) adopts 3904, and the frequency of oscillation of crystal resonator (Y1) is 4M.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810217997.0A CN101431636B (en) | 2008-12-04 | 2008-12-04 | Television set tuner with clock output |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810217997.0A CN101431636B (en) | 2008-12-04 | 2008-12-04 | Television set tuner with clock output |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101431636A true CN101431636A (en) | 2009-05-13 |
| CN101431636B CN101431636B (en) | 2014-04-02 |
Family
ID=40646766
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200810217997.0A Expired - Fee Related CN101431636B (en) | 2008-12-04 | 2008-12-04 | Television set tuner with clock output |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101431636B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114499436A (en) * | 2021-02-05 | 2022-05-13 | 井芯微电子技术(天津)有限公司 | Passive crystal frequency trimming circuit |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN200962636Y (en) * | 2006-10-20 | 2007-10-17 | 四川长虹电器股份有限公司 | TV set high-frequency tuning system |
| CN201039332Y (en) * | 2007-02-13 | 2008-03-19 | 青岛海信电器股份有限公司 | Color system selection circuit and TV set with this selection circuit |
| CN201138370Y (en) * | 2007-12-28 | 2008-10-22 | 雅韬半导体(上海)有限公司 | CMMB mobile phone television demodulation chip test circuit |
-
2008
- 2008-12-04 CN CN200810217997.0A patent/CN101431636B/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114499436A (en) * | 2021-02-05 | 2022-05-13 | 井芯微电子技术(天津)有限公司 | Passive crystal frequency trimming circuit |
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| Publication number | Publication date |
|---|---|
| CN101431636B (en) | 2014-04-02 |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140402 Termination date: 20181204 |