CN201904861U - Satellite digital electronic turner - Google Patents
Satellite digital electronic turner Download PDFInfo
- Publication number
- CN201904861U CN201904861U CN2010206523838U CN201020652383U CN201904861U CN 201904861 U CN201904861 U CN 201904861U CN 2010206523838 U CN2010206523838 U CN 2010206523838U CN 201020652383 U CN201020652383 U CN 201020652383U CN 201904861 U CN201904861 U CN 201904861U
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- satellite digital
- digital electronic
- output port
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Abstract
The utility model discloses a satellite digital electronic turner. A radio frequency signal input port, a radio frequency signal output port and a digital medium frequency signal output port are arranged outside a casing, a satellite digital electronic turner circuit is arranged in the casing and comprises a high-pass filter (HPF), a low-noise radio frequency amplification circuit, a matching network, an automatic gain control (AGC) amplification circuit, a vibration frequency mixing circuit, a filter loop and a medium frequency differential output loop which are sequentially connected, finally, the satellite digital electronic turner is connected to the digital medium frequency signal output port, the radio frequency signal input port is connected with the HPF, and the output end of the matching network is connected with the radio frequency signal output port. The satellite digital electronic turner is mainly used for satellite digital set top boxes, and the electric performance, the reliability and the electromagnetic compatibility are higher than the national and industrial standard.
Description
Technical field
The utility model belongs to signal tuning device technique field, relates to a kind of satellite digital electronic tuning unit.
Background technology
Electronic tuning unit is channel selector again, and it is the essential condition that realizes that multichannel is accepted.The electronics telegon reaches channel switch by the control direct voltage, and the function of AFT is arranged again simultaneously.
Fast development along with the satellite reception technique, the user of receiving satellite word TV signal is soaring, the satellite digital electronic tuning unit is as its receiver auxiliary products, the market demand increases, and all more in the past electronic tuning unit product is more strict at aspects such as energy-conserving and environment-protective, miniaturization, electric property, reliability, Electro Magnetic Compatibilities to require the satellite digital electronic tuning unit.Particularly in the dynamic control range of received signal, aspects such as phase noise are harsh more.Existing electronic tuning unit electric property, reliability, Electro Magnetic Compatibility are all poor.
Summary of the invention
The purpose of this utility model provides a kind of satellite digital electronic tuning unit, and electric property, reliability, Electro Magnetic Compatibility are good.
The technical scheme that the utility model adopted is, the satellite digital electronic tuning unit, comprise housing, housing is outside equipped with radio-frequency (RF) signal input end mouth, radiofrequency signal output port and digital medium-frequency signal output port, be provided with satellite digital electronic tuning unit circuit in the housing, the digital and electronic tuner circuit comprises high pass filter HPF, low noise radio frequency amplifying circuit, matching network, AGC amplifying circuit, local oscillator mixting circuit, filter circuit, the intermediate frequency difference output loop that connects successively, and intermediate frequency difference output loop is connected to the digital medium-frequency signal output port at last; High pass filter HPF is connected with the radio-frequency (RF) signal input end mouth; The output of matching network also is connected with the radiofrequency signal output port; The local oscillator mixting circuit is made up of local oscillator loop and mixting circuit, the output of AGC amplifying circuit is connected to an input of mixting circuit, the output of mixting circuit is connected to the input of filter circuit, and the output in local oscillator loop is connected with another input of mixting circuit.
Feature of the present utility model also is,
AGC amplifying circuit, local oscillator mixting circuit, filter circuit, intermediate frequency difference output loop constitute integrated circuit (IC), and the model of this integrated circuit (IC) is STV6110A.
Satellite digital electronic tuning unit of the present utility model, be mainly used in the satellite digital set-top box, at first will amplify, after the network coupling, wherein one the tunnel be used through high-pass filtering, low noise from the RF radiofrequency signal of satellite antenna with radiofrequency signal output and miscellaneous equipment; Another road enters into STV6110A, through AGC amplifying circuit, Frequency mixing processing, filtering, the output of intermediate frequency difference, enters digital receiver processing television signals part in STV6110A.The electric property of product, reliability, Electro Magnetic Compatibility are higher than country, industry standard.
Description of drawings
Fig. 1 is the structural representation of the utility model satellite digital electronic tuning unit.
Fig. 2 is the circuit theory diagrams of the utility model satellite digital electronic tuning unit.
Among the figure, 1. housing, 2. radio-frequency (RF) signal input end mouth, 3. radiofrequency signal output port, 4. digital medium-frequency signal output port, 5. high pass filter HPF, 6. low noise radio frequency amplifying circuit, 7.AGC amplifying circuit, 8. mixting circuit, 9. filter circuit, 10. local oscillator loop, 11. intermediate frequency difference output loop, 12. matching networks, 13. integrated circuit (IC).
Embodiment
Below in conjunction with the drawings and specific embodiments the utility model is elaborated.
The structure of the utility model satellite digital electronic tuning unit as shown in Figure 1, comprises housing 1, and housing 1 is outside equipped with radio-frequency (RF) signal input end mouth 2, radiofrequency signal output port 3 and digital medium-frequency signal output port 4.Be provided with printed circuit board in the housing 1, satellite digital electronic tuning unit circuit is set on the printed circuit board.
The circuit of the utility model satellite digital electronic tuning unit is the frequency synthesis mode, the circuit theory diagrams of satellite digital electronic tuning unit, as shown in Figure 2, radio-frequency (RF) signal input end mouth 2 is connected with high pass filter HPF 5, low noise radio frequency amplifying circuit 6, matching network 12, AGC amplifying circuit 7, local oscillator mixting circuit, filter circuit 9, intermediate frequency difference output loop 11 in turn, is connected to digital medium-frequency signal output port 4 at last; The output of matching network 12 also is connected with radiofrequency signal output port 3; Wherein, the local oscillator mixting circuit specifically is made up of local oscillator loop 10 and mixting circuit 8, the output of AGC amplifying circuit 7 is connected to an input of mixting circuit 8, the output of mixting circuit 8 is connected to the input of filter circuit 9, and the output in local oscillator loop 10 is connected with another input of mixting circuit 8.AGC amplifying circuit 7, local oscillator mixting circuit, filter circuit 9, intermediate frequency difference output loop 11 have constituted integrated circuit (IC) 13.
The model of integrated circuit (IC) 13 is STV6110A in the electronic tuning unit circuit.
The operation principle of the utility model satellite digital electronic tuning unit is: the radio-frequency (RF) signal input end mouth 2 of receiving the satellite digital electronic tuning unit from the radiofrequency signal of satellite antenna, requirement according to observer, by man-machine communication's control of receiver, control to the satellite digital electronic tuning unit by the selection control signal of receiver main control MCU output.At first, the radiofrequency signal that receives is passed through high pass filter HPF 5 filtering, remove low-frequency disturbance, carrying out the low noise radio frequency by low noise radio frequency amplifying circuit 6 then amplifies, after carrying out the impedance matching in input and output loop by matching network 12 then, wherein one the tunnel be used with radiofrequency signal output port 3 and miscellaneous equipment; Another road is through 7 amplifications of AGC amplifying circuit, the mixing of local oscillator mixting circuit, filter circuit 9 digital intermediate frequency filtering, directly export with the middle frequency difference sub-signal by intermediate frequency difference output loop 11, enter digital receiver processing television signals part through digital medium-frequency signal output port 4, by becoming audio-video signal output after the processing such as DSP, decoding, ADC, excitation loudspeaker plays sound, the excitation display device display image.
The utility model is integrated in satellite digital electronic tuning unit, intermediate frequency differential output circuit in the housing, forms an independently product, and electric property, reliability, Electro Magnetic Compatibility are higher than country, industry standard, can realize that the satellite digital TV signal receives; High frequency amplification, Frequency mixing processing, the intermediate frequency difference output processing of satellite digital TV signal be can realize, ABS-S, DVB-S/S2 satellite receiver are mainly used in.
Claims (2)
1. satellite digital electronic tuning unit, it is characterized in that, comprise housing (1), housing (1) is outside equipped with radio-frequency (RF) signal input end mouth (2), radiofrequency signal output port (3) and digital medium-frequency signal output port (4), be provided with satellite digital electronic tuning unit circuit in the described housing (1), described digital and electronic tuner circuit comprises the high pass filter HPF(5 that connects successively), low noise radio frequency amplifying circuit (6), matching network (12), AGC amplifying circuit (7), the local oscillator mixting circuit, filter circuit (9), intermediate frequency difference output loop (11), intermediate frequency difference output loop (11) is connected to digital medium-frequency signal output port (4) at last; Described high pass filter HPF(5) is connected with radio-frequency (RF) signal input end mouth (2); The output of described matching network (12) also is connected with radiofrequency signal output port (3); Described local oscillator mixting circuit is made up of local oscillator loop (10) and mixting circuit (8), the output of described AGC amplifying circuit (7) is connected to an input of mixting circuit (8), the output of described mixting circuit (8) is connected to the input of filter circuit (9), and the output in described local oscillator loop (10) is connected with another input of mixting circuit (8).
2. satellite digital electronic tuning unit according to claim 1, it is characterized in that, described AGC amplifying circuit (7), local oscillator mixting circuit, filter circuit (9), intermediate frequency difference output loop (11) constitute integrated circuit (IC) (13), and the model of this integrated circuit (IC) (13) is STV6110A.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206523838U CN201904861U (en) | 2010-12-10 | 2010-12-10 | Satellite digital electronic turner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206523838U CN201904861U (en) | 2010-12-10 | 2010-12-10 | Satellite digital electronic turner |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201904861U true CN201904861U (en) | 2011-07-20 |
Family
ID=44275453
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010206523838U Expired - Fee Related CN201904861U (en) | 2010-12-10 | 2010-12-10 | Satellite digital electronic turner |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201904861U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102595077A (en) * | 2012-02-10 | 2012-07-18 | 厦门华侨电子股份有限公司 | Digital display with detachable external Tuner extension module |
-
2010
- 2010-12-10 CN CN2010206523838U patent/CN201904861U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102595077A (en) * | 2012-02-10 | 2012-07-18 | 厦门华侨电子股份有限公司 | Digital display with detachable external Tuner extension module |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110720 Termination date: 20141210 |
|
| EXPY | Termination of patent right or utility model |