CN201557188U - Cable digital tuner - Google Patents
Cable digital tuner Download PDFInfo
- Publication number
- CN201557188U CN201557188U CN2009203119445U CN200920311944U CN201557188U CN 201557188 U CN201557188 U CN 201557188U CN 2009203119445 U CN2009203119445 U CN 2009203119445U CN 200920311944 U CN200920311944 U CN 200920311944U CN 201557188 U CN201557188 U CN 201557188U
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- frequency amplifier
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Abstract
The utility model relates to a cable digital tuner which comprises a band-pass filter for filtering inputted digital signals, the signals after filtration are inputted into a broadband amplifier, the broadband amplifier is used for amplifying the amplitude of the received digital signals, the signals after amplification are divided into two paths to output, one path forms the radio frequency output, the other path is inputted into a high frequency amplifier, the high frequency amplifier amplifies the received signals, the signals after amplification are inputted into a signal processor, the signal processor carries out frequency mixing treatment on the inputted signals, the signals after treatment are inputted into a saw filter, the saw filter is used for filtering out out-of-band signals in the inputted signals, the signals after treatment are inputted into an intermediate frequency amplifier, the intermediate frequency amplifier is used for amplifying the inputted signals, and the signals after amplification are outputted to an intermediate frequency output terminal. The cable digital tuner has higher integration degree and effectively reduces the mounting space and the cost of a set-top box of a cable digital television on the basis of ensuring the performances of the set-top box of the cable digital television.
Description
Technical field
The utility model belongs to technical field of electronic products, relates to a kind of tuner that is applied to cable digital TV set-top box, is specifically related to a kind of cabled digital tuner.
Background technology
Along with the continuous expansion of cable TV network, cable digital TV set-top box has entered huge numbers of families.Cable digital TV set-top box is an analog signal with the cabled digital signal transition of cable TV network transmission, makes the television set that can only receive analog signal also can receive the cabled digital signal.The external imported product of the most of employing of digital tuner in the cable digital TV set-top box that uses at present exists the defective that volume is big, cost is higher.
Summary of the invention
The purpose of this utility model provides a kind of cabled digital tuner, is used for cable digital TV set-top box, guaranteeing to have dwindled volume under the constant situation of cable digital TV set-top box performance, has reduced cost.
The technical scheme that the utility model adopted is, the cabled digital tuner comprises the band pass filter, wide-band amplifier, high-frequency amplifier, signal processor, Surface Acoustic Wave Filter and the intermediate frequency amplifier that are connected successively, wherein,
Band pass filter is used to receive digital radio signal, and the digital radio signal that receives is carried out filtering, and with filtered signal input wide-band amplifier;
Wide-band amplifier is used for the filtered signal of reception bandpass filter, the amplitude of the signal that receives is amplified, and the signal after will amplifying is divided into two-way output, and one the tunnel forms radio frequency output, and high-frequency amplifier is imported on another road;
High-frequency amplifier is used to receive the signal after wide-band amplifier amplifies, and amplitude is to the received signal amplified once more, and incites somebody to action the signal input signal processor of enlargement range once more;
Signal processor is used to receive the high-frequency amplifier signal of enlargement range once more, carries out frequency-selecting and Frequency mixing processing to the received signal, and the input of the signal after will handling Surface Acoustic Wave Filter;
Surface Acoustic Wave Filter is used for the signal after the received signal processor processing, carries out filtering to the received signal, and with the input of the signal after Filtering Processing intermediate frequency amplifier;
Intermediate frequency amplifier is used to receive the signal after the Surface Acoustic Wave Filter Filtering Processing, amplify to the received signal, and the signal conveys after will amplifying is to medium frequency output end;
Signal processor adopts chip SN761668.
Feature of the present utility model also is,
High-frequency amplifier adopts the BF1208 compositing amplification tube of NXP.
Intermediate frequency amplifier adopts chip SN761668.
Digital tuner of the present utility model adopts the chip SN761668 of the high integration that can realize that radiofrequency signal frequency conversion and intermediate-freuqncy signal are amplified, with this tuner application in wired digital set-top box, under the prerequisite that guarantees the wired digital set-top box performance, reduced the volume of set-top box, save installing space, and reduced cost.
Description of drawings
Fig. 1 is the structural representation of a kind of embodiment of the utility model tuner.
Among the figure, 1. band pass filter, 2. wide-band amplifier, 3. high-frequency amplifier, 4. signal processor, 5. Surface Acoustic Wave Filter, 6. intermediate frequency amplifier.
Embodiment
Below in conjunction with the drawings and specific embodiments the utility model is elaborated.
The structure of a kind of embodiment of the utility model tuner as shown in Figure 1, comprises the band pass filter 1, wide-band amplifier 2, high-frequency amplifier 3, signal processor 4, Surface Acoustic Wave Filter 5 and the intermediate frequency amplifier 6 that are connected successively.Wherein,
Wide-band amplifier 2 is used for reception bandpass filter 1 filtered signal, the amplitude of the signal that receives is amplified, and the signal after will amplifying is divided into two-way output, and one the tunnel forms radio frequency output, and high-frequency amplifier 3 is imported on another road;
High-frequency amplifier 3 is used to receive the signal after wide-band amplifier 2 amplifies, and amplitude is to the received signal amplified once more, and incites somebody to action the signal input signal processor 4 of enlargement range once more;
High-frequency amplifier 3 adopts the BF1208 compositing amplification tube of NXP.
Signal processor 4 is used to receive high-frequency amplifier 3 signal of enlargement range once more, carries out frequency-selecting and Frequency mixing processing to the received signal, and the input of the signal after will handling Surface Acoustic Wave Filter 5;
Signal processor 4 adopts chip SN761668.
Surface Acoustic Wave Filter 5 is used for the signal after received signal processor 4 is handled, and the out of band signal in the signal that receives of filtering, with the signal input intermediate frequency amplifier 6 after handling;
Intermediate frequency amplifier 6 is used to receive the signal after Surface Acoustic Wave Filter 5 is handled, and amplify to the received signal, and the signal conveys after will amplifying is to medium frequency output end.
Intermediate frequency amplifier 6 adopts chip SN761668.
The course of work of the utility model tuner:
After digital catv signal enters tuner, at first through greater than 30M, carry out filtering less than the band pass filter 1 of 900M, enter wide-band amplifier 2 through band pass filter 1 filtered signal, the amplitude of 2 pairs of input signals of wide-band amplifier is amplified, signal after wide-band amplifier 2 amplifies is divided into two-way, one the tunnel enters the high-frequency amplifier 3 of wide-band amplifier 2 rear ends, and another road becomes radio frequency output by branch's output.The signal of 3 pairs of inputs of high-frequency amplifier amplifies, and the signal after will amplifying sends into signal processor 4, after signal processor 4 carries out Frequency mixing processing with the signal of input, and the intermediate-freuqncy signal of output 36MHz, this process is controlled by iic bus; The intermediate-freuqncy signal of signal processor 4 outputs enters Surface Acoustic Wave Filter 5 and eliminates out of band signal, owing to decay to some extent through Surface Acoustic Wave Filter 5 filtered signal strength signal intensities, so, the signal of Surface Acoustic Wave Filter 5 outputs is amplified by intermediate frequency amplifier 6 again, and the signal after amplifying by intermediate frequency amplifier 6 exports tuner medium frequency output end to.
This digital tuner adopts horizontal installation when mounted, has saved the installing space of set-top box.The circuit aspect adopts two passage tribands (be that VHF L, VHF H section are share a passage, the UHF section is used a passage).
The utility model tuner is an environmentally friendly machine.Have higher integrated level, be used for cable digital TV set-top box, replace the functions such as reception, frequency conversion and amplification that a large amount of at present import digital tuners that use are realized digital catv signal, realize the miniaturization of product simultaneously.On the basis that guarantees the cable digital TV set-top box performance, effectively reduce the cost and the installing space of cable digital TV set-top box.
Claims (3)
1. the cabled digital tuner is characterized in that, comprises the band pass filter (1), wide-band amplifier (2), high-frequency amplifier (3), signal processor (4), Surface Acoustic Wave Filter (5) and the intermediate frequency amplifier (6) that are connected successively, wherein,
Band pass filter (1) is used to receive digital radio signal, and the digital radio signal that receives is carried out filtering, and with filtered signal input wide-band amplifier (2);
Wide-band amplifier (2) is used for the filtered signal of reception bandpass filter (1), the amplitude of the signal that receives is amplified, and the signal after will amplifying is divided into two-way output, and one the tunnel forms radio frequency output, and high-frequency amplifier (3) is imported on another road;
High-frequency amplifier (3) is used to receive the signal after wide-band amplifier (2) amplifies, and amplitude is to the received signal amplified once more, and incites somebody to action the signal input signal processor (4) of enlargement range once more;
Signal processor (4) is used to receive high-frequency amplifier (3) signal of enlargement range once more, carries out frequency-selecting and Frequency mixing processing to the received signal, and the input of the signal after will handling Surface Acoustic Wave Filter (5);
Surface Acoustic Wave Filter (5) is used for the signal after received signal processor (4) is handled, and carries out filtering to the received signal, and with the input of the signal after Filtering Processing intermediate frequency amplifier (6);
Intermediate frequency amplifier (6) is used to receive the signal after Surface Acoustic Wave Filter (5) Filtering Processing, amplify to the received signal, and the signal conveys after will amplifying is to medium frequency output end;
Described signal processor (3) adopts chip SN761668.
2. according to the described digital tuner of claim 1, it is characterized in that described high-frequency amplifier (3) adopts the BF1208 compositing amplification tube of NXP.
3. according to claim 1 or 2 described digital tuners, it is characterized in that described intermediate frequency amplifier (6) adopts chip SN761668.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009203119445U CN201557188U (en) | 2009-09-30 | 2009-09-30 | Cable digital tuner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009203119445U CN201557188U (en) | 2009-09-30 | 2009-09-30 | Cable digital tuner |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201557188U true CN201557188U (en) | 2010-08-18 |
Family
ID=42616877
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009203119445U Expired - Fee Related CN201557188U (en) | 2009-09-30 | 2009-09-30 | Cable digital tuner |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201557188U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102131068A (en) * | 2011-01-16 | 2011-07-20 | 合肥润东通讯科技有限公司 | Digital TV (television) tuner and filtering method thereof |
| CN111142079A (en) * | 2019-12-18 | 2020-05-12 | 北京海兰信数据科技股份有限公司 | Navigation radar receiver system |
-
2009
- 2009-09-30 CN CN2009203119445U patent/CN201557188U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102131068A (en) * | 2011-01-16 | 2011-07-20 | 合肥润东通讯科技有限公司 | Digital TV (television) tuner and filtering method thereof |
| CN111142079A (en) * | 2019-12-18 | 2020-05-12 | 北京海兰信数据科技股份有限公司 | Navigation radar receiver system |
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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: 20100818 Termination date: 20120930 |