CN201294588Y - Digifax integrated electronic tuner - Google Patents
Digifax integrated electronic tuner Download PDFInfo
- Publication number
- CN201294588Y CN201294588Y CNU200820222451XU CN200820222451U CN201294588Y CN 201294588 Y CN201294588 Y CN 201294588Y CN U200820222451X U CNU200820222451X U CN U200820222451XU CN 200820222451 U CN200820222451 U CN 200820222451U CN 201294588 Y CN201294588 Y CN 201294588Y
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Abstract
The utility model relates to a digital-analog integrated electronic tuning unit. A printed circuit board is arranged in a case body which is provided with a signal input port and a signal output port outside. An input end of an input loop is connected with an analog or digital signal input port, an output end of the input loop is connected with an input end of a tuning loop, an output end of the tuning loop is connected with a mixer circuit input end of a mixer intermediate-frequency amplifying integrated circuit, analog intermediate-frequency signals output by a mixer circuit output end of the mixer intermediate-frequency amplifying integrated circuit are connected with the signal output port, output digital intermediate-frequency signals are connected with an input end of an acoustic surface wave filter, an output end of the acoustic surface wave filter is connected with an amplifying circuit input end of the mixer intermediate-frequency amplifying integrated circuit, and digital signals output by an amplifying circuit output end of the mixer intermediate-frequency amplifying integrated circuit are connected with the signal output port. An intermediate frequency amplifying circuit and a fore mixer circuit of digital part of the utility model are completed in the same integrated circuit, thereby reducing interferences caused by routing directions of signals distribution problems of ground to digital signals. The digital-analog integrated electronic tuning unit is characterized by simple circuit and low cost, which is mainly used with digital-analog compatible color television receivers.
Description
Technical field
The utility model 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 utility model 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 utility model: 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).
Printed circuit board is provided with the analog intermediate frequency demodulator circuit, the analog if signal of the mixting circuit output output of mixing intermediate frequency amplification circuit connects the input of analog intermediate frequency demodulator circuit, the output termination signal output port (3) of analog intermediate frequency demodulator circuit.
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 utility model compared with prior art intermediate frequency amplifier circuit of numerical portion and the mixting circuit of prime is finished 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 utility model, and Fig. 2 is a circuit block diagram of the present utility model, and Fig. 3 is circuit theory diagrams of the present utility model.
Embodiment:
1,2,3 a kind of embodiment of the present utility model 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, mixing intermediate frequency amplification circuit, analog intermediate frequency demodulator circuit 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 the input of analog intermediate frequency demodulator circuit, the output termination signal output port (3) of analog intermediate frequency demodulator circuit; The digital medium-frequency signal of the mixting circuit output output of mixing intermediate frequency amplification circuit 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 if 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 (4)
1, 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), 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, it is characterized in that: printed circuit board is provided with the analog intermediate frequency demodulator circuit, the analog if signal of the mixting circuit output output of mixing intermediate frequency amplification circuit connects the input of analog intermediate frequency demodulator circuit, the output termination signal output port (3) of analog intermediate frequency demodulator circuit.
3, digital-analog integrated electronic tuner according to claim 1 and 2 is characterized in that: described mixing intermediate frequency amplification circuit is IC TUA6039.
4, digital-analog integrated electronic tuner according to claim 3 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 |
|---|---|---|---|
| CNU200820222451XU CN201294588Y (en) | 2008-10-31 | 2008-10-31 | Digifax integrated electronic tuner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU200820222451XU CN201294588Y (en) | 2008-10-31 | 2008-10-31 | Digifax integrated electronic tuner |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201294588Y true CN201294588Y (en) | 2009-08-19 |
Family
ID=41008070
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU200820222451XU Expired - Fee Related CN201294588Y (en) | 2008-10-31 | 2008-10-31 | Digifax integrated electronic tuner |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201294588Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106100653A (en) * | 2016-06-13 | 2016-11-09 | 深圳市华讯方舟卫星通信有限公司 | Mixing discharger |
-
2008
- 2008-10-31 CN CNU200820222451XU patent/CN201294588Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106100653A (en) * | 2016-06-13 | 2016-11-09 | 深圳市华讯方舟卫星通信有限公司 | Mixing discharger |
| CN106100653B (en) * | 2016-06-13 | 2018-01-16 | 深圳市华讯方舟卫星通信有限公司 | It is mixed emitter |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090819 Termination date: 20101031 |