CN201383801Y - FS electronic tuning unit - Google Patents
FS electronic tuning unit Download PDFInfo
- Publication number
- CN201383801Y CN201383801Y CN200920032694U CN200920032694U CN201383801Y CN 201383801 Y CN201383801 Y CN 201383801Y CN 200920032694 U CN200920032694 U CN 200920032694U CN 200920032694 U CN200920032694 U CN 200920032694U CN 201383801 Y CN201383801 Y CN 201383801Y
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Abstract
A FS electronic tuning unit comprises a radio-frequency input circuit, a high-frequency amplifying circuit, a double-tuned circuit, a mixing circuit and an intermediate-frequency output circuit; the mixing circuit is also connected with a local oscillation circuit; the radio-frequency input circuit is used for receiving television signals and tuning and filtering the television signals; the high-frequency amplifying circuit is used for receiving signals output by the radio-frequency input circuit and performing the high-frequency amplification; the double-tuned circuit is used for receiving signals output by the high-frequency amplifying circuit and performing the double-tuned selection; the local oscillation circuit generates local oscillation frequency signals; the mixing circuit is used for receiving signals output by the double-tuned circuit and the local oscillation circuit and mixing, so as to differ a fixed combined television intermediate-frequency signal; and the intermediate-frequency output circuit is used for receiving signals output by the mixing circuit; and the received signals are converted into intermediate-frequency signals to output. The electronic tuning unit is used for analogue large-screen LCD televisions and LED televisions, and has the advantages of precise and simple circuit structure, perfect functions, and stable and reliable property.
Description
Technical field
The utility model belongs to technical field of electronic products, relates to a kind of tuner that is applicable to ultrathin LCD TV of large-screen and LED TV, is specifically related to a kind of FS electronic tuning unit.
Background technology
At present, be applied to the electronic tuning unit of ultrathin LCD TV of large-screen and LED TV, adopt horizontal installation mostly, the rf input terminal of tuner and row's pin are lifted one's head from the lateral frame of tuner architecture part, it is bigger to make that electronic tuning unit takies the space of TV SKD, is unfavorable for ultra-thinization of panel TV complete machine.
Summary of the invention
The purpose of this utility model provides a kind of FS electronic tuning unit, is used for ultrathin LCD TV of large-screen and LED TV, has solved existing electronic tuning unit and has taken big TV SKD space, influences the problem of ultra-thinization of panel TV complete machine.
The technical scheme that the utility model adopted is, the FS electronic tuning unit comprises the radio frequency input circuit, high-frequency amplifier circuit, double-tuned circuit, mixting circuit and the intermediate frequency output circuit that connect successively, and mixting circuit also is connected with local oscillation circuit, wherein,
The radio frequency input circuit is used for received television signal, and the TV signal that receives is carried out tuning and filtering, and the input of the signal after will handling high-frequency amplifier circuit;
High-frequency amplifier circuit is used for the signal that the received RF input circuit is exported, and the signal that receives is carried out high frequency amplify, and the input of the signal after will amplifying double-tuned circuit;
Double-tuned circuit is used to receive the signal that high-frequency amplifier circuit is exported, and the signal that receives is carried out double tunning select, and the input of the signal after will handling mixting circuit;
Local oscillation circuit is used to produce the local frequency signal, and with this signal input mixting circuit;
Mixting circuit is used to receive the signal of double-tuned circuit and local oscillation circuit output, and two signals that receive are carried out mixing, and difference goes out a fixing full tv-if signal, and should import the intermediate frequency output circuit by full tv-if signal;
The intermediate frequency output circuit is used to receive the full tv-if signal that mixting circuit is exported, and is intermediate-freuqncy signal with this signal transition, and with this intermediate-freuqncy signal input whole set of television circuit.
The utility model electronic tuning unit has miniaturization, high-gain frequency synthesis and the good advantage of selectivity, and the volume of the existing electronic tuning unit of its volume ratio has reduced 1/4.
Description of drawings
Fig. 1 is the structural representation of a kind of embodiment of the utility model electronic tuning unit.
Among the figure, 1. radio frequency input circuit, 2. high-frequency amplifier circuit, 3. double-tuned circuit, 4. mixting circuit, 5. local oscillation circuit, 6. intermediate frequency output circuit.
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 electronic tuning unit, as shown in Figure 1.Comprise the radio frequency input circuit 1, high-frequency amplifier circuit 2, double-tuned circuit 3, mixting circuit 4 and the intermediate frequency output circuit 6 that connect successively, mixting circuit 4 also is connected with local oscillation circuit 5.
Radio frequency input circuit 1 is used for received television signal, and the TV signal that receives is carried out tuning and filtering, and the input of the signal after will handling high-frequency amplifier circuit 2;
High-frequency amplifier circuit 2 is used for the signal that received RF input circuit 1 is exported, and the signal that receives is carried out high frequency amplify, and the input of the signal after will amplifying double-tuned circuit 3;
Double-tuned circuit 3 is used to receive the signal that high-frequency amplifier circuit 2 is exported, and the signal that receives is carried out double tunning select, and the input of the signal after will handling mixting circuit 4;
Intermediate frequency output circuit 6 is used to receive the full tv-if signal that mixting circuit 4 is exported, and is intermediate-freuqncy signal with this signal transition, and with this intermediate-freuqncy signal input whole set of television circuit.
The utility model electronic tuning unit is carrying out adopting double sided board when PCB sets type, and the front mounts, the reverse side plug-in mounting, and component density is moderate, and three reflow soldering processes are adopted in welding.The high density layouts element makes the structural body miniaturization of this tuner, and the volume of the existing tuner of its volume ratio has reduced 1/4, simultaneously the rf input terminal of tuner is vertically drawn from the structural member top, and row's pin is vertically drawn from the structural member below.Plane space compression with existing tuner extends to vertical direction, changes the mounting means of tuner at the panel TV mainboard, changes into the mode of lifting one's head behind by the original below mode of lifting one's head.Realized the miniaturization of tuner, can make panel TV set realize ultra-thinization.
The course of work of the utility model electronic tuning unit:
The colour TV signal that receives enters three radio-frequency channels of radio frequency input circuit 1 respectively, 1 pair of colour TV signal that receives of radio frequency input circuit carries out tuning and filtering, signal after radio frequency input circuit 1 is handled enters high-frequency amplifier circuit 2, the signal of 2 pairs of inputs of high-frequency amplifier circuit carries out high frequency and amplifies, through high-frequency amplifier circuit 2 amplifying signals input double-tuned circuit 3, the signal of 3 pairs of receptions of double-tuned circuit carries out double tunning and selects, send into mixting circuit 4 by the signal after double-tuned circuit 3 processing, the local oscillator level of local oscillation circuit 5 is capacitance connecting three point type oscillators, be used to produce a local oscillation signal, this local oscillation signal is also imported mixting circuit 4, two signals of 4 pairs of inputs of mixting circuit carry out mixing, difference goes out a fixing full tv-if signal, signal after mixting circuit 4 is handled is sent into intermediate frequency output circuit 6, after the signal of 6 pairs of inputs of intermediate frequency output circuit is handled, obtain intermediate-freuqncy signal, and this intermediate-freuqncy signal sent into video detecting circuit and sound accompaniment detecting circuit in the whole set of television circuit, video detecting circuit and sound accompaniment detecting circuit carry out after the respective handling output image and sound respectively to the signal that receives.
The circuit structure of the utility model electronic tuning unit is tight, and perfect in shape and function is stable and reliable for performance, and circuit is simple, and cost is lower.Be mainly used in matched simulated large-screen liquid crystal display television and LED TV.
Claims (1)
1. FS electronic tuning unit, it is characterized in that comprise the radio frequency input circuit (1), high-frequency amplifier circuit (2), double-tuned circuit (3), mixting circuit (4) and the intermediate frequency output circuit (6) that connect successively, mixting circuit (4) also is connected with local oscillation circuit (5), wherein
Radio frequency input circuit (1) is used for received television signal, and the TV signal that receives is carried out tuning and filtering, and the input of the signal after will handling high-frequency amplifier circuit (2);
High-frequency amplifier circuit (2) is used for the signal that received RF input circuit (1) is exported, and the signal that receives is carried out high frequency amplify, and the input of the signal after will amplifying double-tuned circuit (3);
Double-tuned circuit (3) is used to receive the signal that high-frequency amplifier circuit (2) is exported, and the signal that receives is carried out double tunning select, and the input of the signal after will handling mixting circuit (4);
Local oscillation circuit (5) is used to produce the local frequency signal, and with this signal input mixting circuit (4);
Mixting circuit (4) is used to receive the signal of double-tuned circuit (3) and local oscillation circuit (5) output, and two signals that receive are carried out mixing, and difference goes out a fixing full tv-if signal, and should import intermediate frequency output circuit (6) by full tv-if signal;
Intermediate frequency output circuit (6) is used to receive the full tv-if signal that mixting circuit (4) is exported, and is intermediate-freuqncy signal with this signal transition, and with this intermediate-freuqncy signal input whole set of television circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200920032694U CN201383801Y (en) | 2009-04-20 | 2009-04-20 | FS electronic tuning unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200920032694U CN201383801Y (en) | 2009-04-20 | 2009-04-20 | FS electronic tuning unit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201383801Y true CN201383801Y (en) | 2010-01-13 |
Family
ID=41527272
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200920032694U Expired - Fee Related CN201383801Y (en) | 2009-04-20 | 2009-04-20 | FS electronic tuning unit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201383801Y (en) |
-
2009
- 2009-04-20 CN CN200920032694U patent/CN201383801Y/en not_active Expired - Fee Related
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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: 20100113 Termination date: 20140420 |