CN101729824A - Digital-analog integrated electronic tuner - Google Patents
Digital-analog integrated electronic tuner Download PDFInfo
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- CN101729824A CN101729824A CN200810232278A CN200810232278A CN101729824A CN 101729824 A CN101729824 A CN 101729824A CN 200810232278 A CN200810232278 A CN 200810232278A CN 200810232278 A CN200810232278 A CN 200810232278A CN 101729824 A CN101729824 A CN 101729824A
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Abstract
The invention relates to a digital-analog integrated electronic tuner. A shell of the tuner is internally provided with a printed circuit board and externally provided with a signal input port and a signal output port. The input end of an input loop is connected with an analog or digital signal input port, and the output end of the input loop is connected with the input end of a tuning loop; the output end of the tuning loop is connected with a mixer circuit input end of a mixing and intermediate frequency amplifier integrated circuit, analog intermediate frequency signals output by a mixer circuit output end of the mixing and intermediate frequency amplifier integrated circuit are connected with the signal output port, and output digital intermediate frequency signals are connected with the input end of a surface acoustic filter; and the output end of the surface acoustic filter is reconnected into an amplifier circuit input end of the mixing and intermediate frequency amplifier integrated circuit, and digital signals output by an amplifier circuit output end of the mixing and intermediate frequency amplifier integrated circuit are connected with the signal output port. The intermediate frequency amplifier circuit of a digital part and a mixer circuit of a preceding stage are completed in the same integrated circuit so as to reduce external interferences to digital signals by the routing direction of signals and the configuration problem on the ground. The electronic tuner has simple circuit and lower cost and is mainly used for a matched digital and analog compatible color television receiver.
Description
Technical field
The present invention relates to a kind of digital-analog integrated electronic tuner, is a kind of digital simulation TV receiver digital simulation integrated electronic tuner.
Background technology
Digital-analog integrated electronic tuner of the same type has adopted mixing, intermediate frequency to amplify two integrated circuits in the prior art.The analog or digital signal of input enters the mixing integrated circuit through input circuit, resonant tank, and the demodulator circuit that output intermediate-freuqncy signal, the intermediate-freuqncy signal of simulation enter the back level demodulates audio-video signal; Digital signal enters the intermediate frequency amplification circuit after by Surface Acoustic Wave Filter, exports the digital signal of balance then.The entire circuit complexity, cost is higher.
Summary of the invention
The technical problem that the present invention solves: design a kind of digital-analog integrated electronic tuner, the analog or digital signal of input enters mixing intermediate frequency amplification circuit through input circuit, resonant tank, export analog-and digital-intermediate-freuqncy signal, the demodulator circuit that analog if signal enters the back level demodulates audio-video signal, digital medium-frequency signal enters mixing intermediate frequency amplification circuit after by Surface Acoustic Wave Filter once more, carries out the two ways of digital signals that intermediate frequency amplifies back output balance at IC interior.
Technical solution of the present invention: a kind of digital-analog integrated electronic tuner, comprise housing (1), housing is provided with printed circuit board in (1), housing (1) is outside equipped with signal input port (2) and signal output port (3), and printed circuit board is provided with input circuit, resonant tank and Surface Acoustic Wave Filter; The input termination analog or digital signal input port (2) of input circuit, the input of the output termination resonant tank of input circuit, the mixting circuit input of the output termination mixing intermediate frequency amplification circuit of resonant tank, the analog if signal of the mixting circuit output output of mixing intermediate frequency amplification circuit connects signal output port (3), the digital medium-frequency signal of output connects the input of Surface Acoustic Wave Filter, the output of Surface Acoustic Wave Filter inserts the input amplifier of mixing intermediate frequency amplification circuit once more, and the digital signal of the amplification circuit output end output of mixing intermediate frequency amplification circuit connects signal output port (3).
Described mixing intermediate frequency amplification circuit is IC TUA6039.
Described printed circuit board is a double-sided PCB, and surface mount elements is mounted on the top layer of printed board, and the plug-in unit element is inserted into the bottom of printed board.Second reflow technology is adopted in welding.
The present invention compared with prior art intermediate frequency amplifier circuit of numerical portion and the mixting circuit of prime finishes at same integrated circuit, can reduce outside because of signal direction of routing and the problem of arranging on ground to the interference of digital signal.Circuit is simple, and cost is lower.
Description of drawings
Fig. 1 is a structural representation of the present invention, and Fig. 2 is a circuit block diagram of the present invention, and Fig. 3 is circuit theory diagrams of the present invention.
Embodiment:
1,2,3 a kind of embodiment of the present invention is described in conjunction with the accompanying drawings.
A kind of digital-analog integrated electronic tuner, its housing is provided with printed circuit board in (1), housing (1) is outside equipped with signal input port (2) and signal output port (3), and signal input port (2) is the radio-frequency (RF) signal input end mouth, and signal output port (3) is one group of row's pin.Printed circuit board is provided with input circuit, resonant tank and Surface Acoustic Wave Filter; The input termination analog or digital signal input port (2) of input circuit, the input of the output termination resonant tank of input circuit, the mixting circuit input of the output termination mixing intermediate frequency amplification circuit of resonant tank, the analog if signal of the mixting circuit output output of mixing intermediate frequency amplification circuit connects signal output port (3); The digital medium-frequency signal of output connects the input of Surface Acoustic Wave Filter, the output of Surface Acoustic Wave Filter inserts the input amplifier of mixing intermediate frequency amplification circuit once more, and the digital signal of the amplification circuit output end output of mixing intermediate frequency amplification circuit connects signal output port (3).Mixing intermediate frequency amplification circuit is IC TUA6039.Printed circuit board is a double-sided PCB, and surface mount elements is mounted on the top layer of printed board, and the plug-in unit element is inserted into the bottom of printed board.
Operation principle: the analog or digital high-frequency TV carrier signal of input enters mixing intermediate frequency amplification circuit by input circuit, resonant tank, the output intermediate frequency is that 45.75 analog signal or intermediate frequency are the digital signal of 44MHz after mixing, and the analog signal demodulator circuit that the analog signal of output enters the back level demodulates audio-video signal.The digital medium-frequency signal of output enters the related circuit that digital signal that mixing intermediate frequency amplification circuit carries out output balance after the processing and amplifying enters TV SKD once more through Surface Acoustic Wave Filter and handles.
Claims (3)
1. digital-analog integrated electronic tuner, comprise housing (1), housing is provided with printed circuit board in (1), housing (1) is outside equipped with signal input port (2) and signal output port (3), printed circuit board is provided with input circuit, resonant tank and Surface Acoustic Wave Filter, the input termination analog or digital signal input port (2) of input circuit, the input of the output termination resonant tank of input circuit, it is characterized in that: the mixting circuit input of the output termination mixing intermediate frequency amplification circuit of resonant tank, the analog if signal of the mixting circuit output output of mixing intermediate frequency amplification circuit connects signal output port (3), the digital medium-frequency signal of output connects the input of Surface Acoustic Wave Filter, the output of Surface Acoustic Wave Filter inserts the input amplifier of mixing intermediate frequency amplification circuit once more, and the digital signal of the amplification circuit output end output of mixing intermediate frequency amplification circuit connects signal output port (3).
2. digital-analog integrated electronic tuner according to claim 1 is characterized in that: described mixing intermediate frequency amplification circuit is IC TUA6039.
3. digital-analog integrated electronic tuner according to claim 1 and 2 is characterized in that: described printed circuit board is a double-sided PCB, and surface mount elements is mounted on the top layer of printed board, and the plug-in unit element is inserted into the bottom of printed board.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810232278A CN101729824A (en) | 2008-10-31 | 2008-10-31 | Digital-analog integrated electronic tuner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810232278A CN101729824A (en) | 2008-10-31 | 2008-10-31 | Digital-analog integrated electronic tuner |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101729824A true CN101729824A (en) | 2010-06-09 |
Family
ID=42449911
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200810232278A Pending CN101729824A (en) | 2008-10-31 | 2008-10-31 | Digital-analog integrated electronic tuner |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101729824A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106257927A (en) * | 2015-06-24 | 2016-12-28 | 上海未来宽带技术股份有限公司 | Tuner |
-
2008
- 2008-10-31 CN CN200810232278A patent/CN101729824A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106257927A (en) * | 2015-06-24 | 2016-12-28 | 上海未来宽带技术股份有限公司 | Tuner |
| CN106257927B (en) * | 2015-06-24 | 2019-11-08 | 上海未来宽带技术股份有限公司 | Tuner |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Open date: 20100609 |