CN202374360U - Multi-mode digital-analog integrated tuner - Google Patents
Multi-mode digital-analog integrated tuner Download PDFInfo
- Publication number
- CN202374360U CN202374360U CN2011205401611U CN201120540161U CN202374360U CN 202374360 U CN202374360 U CN 202374360U CN 2011205401611 U CN2011205401611 U CN 2011205401611U CN 201120540161 U CN201120540161 U CN 201120540161U CN 202374360 U CN202374360 U CN 202374360U
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Abstract
The utility model discloses a multi-mode digital-analog integrated tuner, which comprises a radio frequency filter circuit connected with an antenna, wherein an intermediate-frequency pre-amplifying circuit, a radio frequency input circuit, a high-frequency amplifying circuit, a double-tuning circuit, a mixer circuit, an intermediate-frequency amplifying circuit and a digital intermediate-frequency output circuit are connected to the radio frequency filtering circuit in sequence; the DC/DC conversion circuit is respectively connected with the radio frequency filtering circuit, the double-tuning circuit and a local oscillator circuit; the local oscillator circuit is also connected with the mixer circuit; an analog intermediate-frequency output circuit is connected to the mixer circuit; and the digital intermediate-frequency output circuit and the analog intermediate-frequency output circuit are respectively connected with an external TV movement. The multi-mode digital-analog integrated tuner disclosed by the utility model can simultaneously receive analog TV signals, wired digital TV signals and ground digital TV signals.
Description
Technical field
The utility model belongs to technical field of electronic products, relates to a kind of digital-analog integrated tuner of multi-mode that is applicable to panel TV.
Background technology
In recent years, DTV has obtained rapid popularization in China, and especially the digital television signal conversion work of CHINA RFTCOM Co Ltd has obtained fast development.Present stage DTV STB occurred in order to realize the reception of digital television signal, and this uses for the user of television set and has brought inconvenience.Together along with development of electronic technology; The raising of integrated circuit technique; The television set decoding chip can be integrated into DVB-C signal decoding and anolog TV signals decoding in the same integrated circuit, and this provides technical support for the development of digital-analog integrated whole set of television.Consider that based on national security China has issued the terrestrial DTV standard DTMB of China in 2006 in addition, television set needs to open a way receiving digital television signal after China's anolog TV signals are broken.And also do not have now an electronic tuning unit of compatible receiving digital television signal and anolog TV signals simultaneously.
Summary of the invention
The purpose of the utility model provides the digital-analog integrated tuner of a kind of multi-mode, can compatiblely simultaneously receive anolog TV signals, digital catv signal and ground digital television signal.
The technical scheme that the utility model adopted is; The digital-analog integrated tuner of multi-mode; Comprise the rf filtering circuit that is connected with antenna; The rf filtering circuit is connected with preparatory intermediate level circuit, radio frequency input circuit, high-frequency amplifier circuit, double-tuned circuit, mixting circuit, IF amplifier circuit and digital intermediate frequency output circuit in turn, and the DC/DC change-over circuit is connected with rf filtering circuit, double-tuned circuit, local oscillation circuit respectively, and local oscillation circuit also is connected with mixting circuit; Mixting circuit also is connected with the analog intermediate frequency output circuit, and digital intermediate frequency output circuit, analog intermediate frequency output circuit are connected with the TV core plate of outside respectively.
The digital-analog integrated tuner of the multi-mode of the utility model, the radio-frequency technique of application of advanced and I2C bussing technique are realized the locking to frequency, through the design of internal circuit, reach the purpose of frequency-selecting, with the local oscillation circuit mixing, finally realize the application of frequency conversion.Product is that product has horizontally-mounted characteristics to currently marketed high-end LED whole set of television development.The utility model tuner home address is selected to confirm; Debug identical with the application controls mode, band internal DC/DC conversion circuit unit, in advance the intermediate level circuit mode of operation is optional; Band internal digital intermediate level circuit, main IC internal lock phase loop section is controlled tuner through phase demodulation and is locked on the corresponding channel.Can compatiblely simultaneously receive anolog TV signals, digital catv signal and ground digital television signal.
Description of drawings
Fig. 1 is the electrical block diagram of the digital-analog integrated tuner of the utility model multi-mode.
Among Fig. 1,1. rf filtering circuit, 2. intermediate level circuit, 3. radio frequency input circuit in advance; 4. high-frequency amplifier circuit, 5. double-tuned circuit, 6. mixting circuit, 7. local oscillation circuit; 8. IF amplifier circuit, 9. digital intermediate frequency output circuit, 10. analog intermediate frequency output circuit, 11.DC/DC change-over circuit.
Embodiment
Below in conjunction with accompanying drawing and embodiment the utility model is elaborated.
The circuit diagram of the digital-analog integrated tuner of the utility model multi-mode is as shown in Figure 1; Comprise the rf filtering circuit 1 that is connected with antenna; Rf filtering circuit 1 is connected with preparatory intermediate level circuit 2, radio frequency input circuit 3, high-frequency amplifier circuit 4, double-tuned circuit 5, mixting circuit 6, IF amplifier circuit 8 and digital intermediate frequency output circuit 9 in turn; DC/DC change-over circuit 11 is connected with rf filtering circuit 1, double-tuned circuit 5, local oscillation circuit 7 respectively; Local oscillation circuit 7 also is connected with mixting circuit 6, and mixting circuit 6 also is connected with analog intermediate frequency output circuit 10.Digital intermediate frequency output circuit 9, analog intermediate frequency output circuit 10 are connected with the TV core plate of outside respectively.
Through courses of work such as amplification, filtering, mixing, be transformed to intermediate frequency by TV signal shown in Figure 1, after digital intermediate frequency output circuit 9 or 10 outputs of analog intermediate frequency output circuit, send into the Core of TV set plate.Wherein,
Preparatory intermediate level circuit 2, this unit is a gating unit, only digital intermediate frequency is amplified as required, when the television set receiving digital television signal, through this element circuit conducting of internal control circuit control; When receiving anolog TV signals, this not conducting of module.
Radio frequency input circuit 3 is used for the signal that received RF filter circuit 1 or preparatory intermediate level circuit 2 are exported, and the signal that receives is carried out frequency-selecting and filtering.
High-frequency amplifier circuit 4 is used for the signal that received RF input circuit 3 is exported, and the signal of selecting is amplified.
Double-tuned circuit 5 is used to receive the signal that high-frequency amplifier circuit 4 is exported, and the signal that receives is carried out double tunning select, and the input of the signal after will handling mixting circuit 6.
Mixting circuit 6 is used to receive the signal of double-tuned circuit 5 and local oscillation circuit 7 outputs, and the signal that receives is carried out mixing.
IF amplifier circuit 8, the DTV intermediate-freuqncy signal after SAW filter filtering, is sent into IF amplifier circuit 8 by after the mixting circuit output, carry out the amplification of 10dB～40dB after, send into digital intermediate frequency output circuit 9.
Digital intermediate frequency output circuit 9 receives the signal that IF amplifier circuit 8 is exported, and this intermediate-freuqncy signal is sent into whole set of television.
Analog intermediate frequency output circuit 10 receives the signal that mixting circuit 6 is exported, and is intermediate-freuqncy signal with the signal transition that receives, and with this intermediate-freuqncy signal input circuitry.
DC/DC change-over circuit 11 is used for the conversion of voltage, VT is provided for radio frequency input circuit 3, double-tuned circuit 5, local oscillation circuit 7.
The operation principle of the utility model:
The anolog TV signals process is; Anolog TV signals input radio frequency filter circuit 1 carries out filtering, and intermediate level circuit 2 is not worked in advance, sends into radio frequency input circuit 3 then and carries out filtering and frequency-selecting; The high-frequency amplifier circuit of being made up of MOS-FET again 4 amplifies; Thereafter the local oscillation signal that produces of signal double-tuned circuit 5 and local oscillation circuit 7 is sent into mixting circuit 6 and is carried out mixing, and with the fixedly intermediate frequency output of 38MHz, the motherboard that whole process radio frequency automatic gain is controlled by the outside provides.
The digital television signal process is after digital television signal input radio frequency filter circuit 1 carries out filtering, to send into preparatory intermediate level circuit 2 and amplify; Send into radio frequency input circuit 3 then and carry out filtering and frequency-selecting, the high-frequency amplifier circuit of being made up of MOS-FET again 4 amplifies, and the local oscillation signal that produces of signal double-tuned circuit 5 and local oscillation circuit 7 is sent into mixting circuit 6 and carried out mixing thereafter; With the fixedly intermediate frequency output of 36MHz; After the input SAW filter filtering, send into intermediate frequency amplifying unit 8, carry out the amplification of 10dB～40dB after; Send into digital intermediate frequency output circuit 9, and this intermediate-freuqncy signal is sent into whole set of television.
Claims (1)
1. digital-analog integrated tuner of multi-mode; It is characterized in that; Comprise the rf filtering circuit (1) that is connected with antenna; Rf filtering circuit (1) is connected with preparatory intermediate level circuit (2), radio frequency input circuit (3), high-frequency amplifier circuit (4), double-tuned circuit (5), mixting circuit (6), IF amplifier circuit (8) and digital intermediate frequency output circuit (9) in turn; DC/DC change-over circuit (11) is connected with rf filtering circuit (1), double-tuned circuit (5), local oscillation circuit (7) respectively; Said local oscillation circuit (7) also is connected with mixting circuit (6), and mixting circuit (6) also is connected with analog intermediate frequency output circuit (10), and said digital intermediate frequency output circuit (9), analog intermediate frequency output circuit (10) are connected with the TV core plate of outside respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205401611U CN202374360U (en) | 2011-12-16 | 2011-12-16 | Multi-mode digital-analog integrated tuner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205401611U CN202374360U (en) | 2011-12-16 | 2011-12-16 | Multi-mode digital-analog integrated tuner |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202374360U true CN202374360U (en) | 2012-08-08 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011205401611U Expired - Fee Related CN202374360U (en) | 2011-12-16 | 2011-12-16 | Multi-mode digital-analog integrated tuner |
Country Status (1)
| Country | Link |
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| CN (1) | CN202374360U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113162652A (en) * | 2021-04-29 | 2021-07-23 | 陕西凌云电器集团有限公司 | Method and module for detecting frequency of spread spectrum signal |
-
2011
- 2011-12-16 CN CN2011205401611U patent/CN202374360U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113162652A (en) * | 2021-04-29 | 2021-07-23 | 陕西凌云电器集团有限公司 | Method and module for detecting frequency of spread spectrum signal |
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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: 20120808 Termination date: 20141216 |
|
| EXPY | Termination of patent right or utility model |