CN201608807U - Multi-mode frequency synthesized electronic turner - Google Patents
Multi-mode frequency synthesized electronic turner Download PDFInfo
- Publication number
- CN201608807U CN201608807U CN2009203122024U CN200920312202U CN201608807U CN 201608807 U CN201608807 U CN 201608807U CN 2009203122024 U CN2009203122024 U CN 2009203122024U CN 200920312202 U CN200920312202 U CN 200920312202U CN 201608807 U CN201608807 U CN 201608807U
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Abstract
A multi-mode frequency synthesized electronic turner comprises a wide band amplifying loop, a radio-frequency input loop, a high-frequency amplifying circuit, a double-tuned circuit, a mixing circuit and a local oscillating circuit, wherein the wide band amplifying loop is used for receiving television signals and amplifying the signals of broad band and low noise; the radio-frequency input loop is used for receiving the signals output from the wide band amplifying loop and conducting preliminary frequency-selecting and mid-frequency trapping processes on the received signals; the high-frequency amplifying circuit is used for receiving the signals transmitted by the radio-frequency input loop and conducting high-frequency amplification on the received signals; the double-tuned circuit is used for receiving the signals transmitted by the high-frequency amplifying circuit and conducting frequency-selecting and tuning process on the received signals; the local oscillating circuit is used for generating local oscillating signals; and the mixing circuit is used for receiving the signals output from the double-tuned circuit and the local oscillating circuit, mixing the frequencies, gaining and outputting the mid-frequency television signals. The tuner provided by the utility model has the characteristics of multiple modes, miniaturization and low noise, and can save installation space.
Description
Technical field
The utility model belongs to technical field of electronic products, relates to a kind of tuner that is used for high definition panel TV receiver, is specifically related to a kind of multi-mode frequency synthesising type electronic tuning unit.
Background technology
At present, be applied to the electronic tuning unit of the integrated large-screen high-resolution degree panel TV receiver of digital DVB-T, DVB-C and analog pal, have function singleness, the defective that volume is bigger.
Summary of the invention
The purpose of this utility model provides a kind of multi-mode frequency synthesising type electronic tuning unit, is used for large-screen high-resolution degree panel TV receiver, and it is less to have a volume, the characteristics that function is more.
The technical scheme that the utility model adopted is, multi-mode frequency synthesising type electronic tuning unit comprises the broadband amplifying return circuit, radio frequency input circuit, high-frequency amplifier circuit, double-tuned circuit, mixting circuit and the local oscillation circuit that connect successively, wherein,
The broadband amplifying return circuit is used for received television signal, carry out the low noise signal of broadband to the received signal and amplify, with the signal conveys after amplifying to the radio frequency input circuit;
The radio frequency input circuit is used to receive the signal that the broadband amplifying return circuit is exported, and carry out preliminary frequency-selecting and intermediate frequency trap to the received signal and handle, and the signal conveys tremendously high frequency amplifying circuit after will handling;
High-frequency amplifier circuit is used for the signal that the received RF input circuit is carried, and carry out high frequency to the received signal and amplify, and the signal conveys after will amplifying is to double-tuned circuit;
Double-tuned circuit is used to receive the signal that high-frequency amplifier circuit is carried, and carry out frequency-selecting and tuning processing to the received signal, and the signal conveys after will handling is to mixting circuit;
Local oscillation circuit is used to produce local oscillation signal, and this local oscillation signal is delivered to mixting circuit;
Mixting circuit is used to receive the signal of double-tuned circuit output and the local oscillation signal of local oscillation circuit output, and these two kinds of signals that receive are carried out mixing, obtains medium-frequency TV signal, and exports this medium-frequency TV signal.
Characteristics of the present utility model also are,
The signal that broadband amplifying return circuit wherein receives is the analog pal TV signal, perhaps digital DVB-T/DVB-C colour TV signal.
The utility model tuner can compatible analog pal and Digital Television DVB-C, DVB-T, has the received signal multi-mode, thickness is ultra-thin and low noise advantage, and level is installed in the whole set of television, can save installing space.
Description of drawings
Fig. 1 is the structural representation of a kind of embodiment of the utility model tuner.
Among the figure, 1. broadband amplifying return circuit, 2. radio frequency input circuit, 3. high-frequency amplifier circuit, 4. double-tuned circuit, 5. mixting circuit, 6. local oscillation 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 tuner as shown in Figure 1, comprises the broadband amplifying return circuit 1, radio frequency input circuit 2, high-frequency amplifier circuit 3, double-tuned circuit 4 and the mixting circuit 5 that connect successively, and mixting circuit 5 also is connected with local oscillation circuit 6, wherein,
Broadband amplifying return circuit 1 is used to receive the analog pal TV signal, and perhaps digital DVB-T/DVB-C colour TV signal carries out the low noise signal of broadband to the received signal and amplifies, with the signal conveys after amplifying to radio frequency input circuit 2;
Radio frequency input circuit 2 is used to receive the signal that broadband amplifying return circuit 1 is exported, and carry out preliminary frequency-selecting and intermediate frequency trap to the received signal and handle, and the signal conveys tremendously high frequency amplifying circuit 3 after will handling;
High-frequency amplifier circuit 3 is used for the signal that received RF input circuit 2 is carried, and the high frequency that carries out the 20MHz bandwidth to the received signal amplifies, and the signal conveys after will amplifying is to double-tuned circuit 4;
Double-tuned circuit 4 is used to receive the signal that high-frequency amplifier circuit 3 is carried, and carry out frequency-selecting and tuning processing to the received signal, and the signal conveys after will handling is to mixting circuit 5;
This electronic tuning unit is carrying out adopting the single sided board design technology when PCB sets type, and two-sided subsides are inserted and loaded in mixture technological design, and component density is moderate, and second reflow technology is adopted in welding.This tuner body thickness has only 8mm, and level is installed on the whole set of television, can save the space.
The course of work of the utility model tuner:
The colour TV signal that receives enters broadband amplifying return circuit 1, broadband amplifying return circuit 1 carries out processing and amplifying to the received signal, signal after broadband amplifying return circuit 1 is handled enters three radio-frequency channels of radio frequency input circuit 2, radio frequency input circuit 2 carries out tuning and filtering to the received signal, signal after radio frequency input circuit 2 is handled enters high-frequency amplifier circuit 3, the signal of 3 pairs of inputs of high-frequency amplifier circuit carries out high frequency and amplifies, through high-frequency amplifier circuit 3 amplifying signals input double-tuned circuit 4, the signal of 4 pairs of receptions of double-tuned circuit carries out double tunning and selects, send into mixting circuit 5 by the signal after double-tuned circuit 4 processing, the local oscillator level of local oscillation circuit 6 is capacitance connecting three point type oscillators, be used to produce a local oscillation signal, this local oscillation signal is also imported mixting circuit 5, two signals of 5 pairs of inputs of mixting circuit carry out mixing, difference goes out a fixing intermediate-freuqncy signal, signal after mixting circuit 5 is handled is sent into the intermediate frequency output circuit, after the intermediate frequency output circuit is handled the signal of input, 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 utility model tuner has multi-mode, miniaturization and low noise characteristics, and can save installing space.
Claims (2)
1. multi-mode frequency synthesising type electronic tuning unit, it is characterized in that, comprise the broadband amplifying return circuit (1), radio frequency input circuit (2), high-frequency amplifier circuit (3), double-tuned circuit (4), mixting circuit (5) and the local oscillation circuit (6) that connect successively, wherein
Broadband amplifying return circuit (1) is used for received television signal, carry out the low noise signal of broadband to the received signal and amplify, with the signal conveys after amplifying to radio frequency input circuit (2);
Radio frequency input circuit (2) is used to receive the signal that broadband amplifying return circuit (1) is exported, and carry out preliminary frequency-selecting and intermediate frequency trap to the received signal and handle, and the signal conveys tremendously high frequency amplifying circuit (3) after will handling;
High-frequency amplifier circuit (3) is used for the signal that received RF input circuit (2) is carried, and carry out high frequency to the received signal and amplify, and the signal conveys after will amplifying is to double-tuned circuit (4);
Double-tuned circuit (4) is used to receive the signal that high-frequency amplifier circuit (3) is carried, and carry out frequency-selecting and tuning processing to the received signal, and the signal conveys after will handling is to mixting circuit (5);
Local oscillation circuit (6) is used to produce local oscillation signal, and this local oscillation signal is delivered to mixting circuit (5);
Mixting circuit (5) is used to receive the signal of double-tuned circuit (4) output and the local oscillation signal of local oscillation circuit (6) output, and these two kinds of signals that receive are carried out mixing, obtains medium-frequency TV signal, and exports this medium-frequency TV signal.
2. according to the described electronic tuning unit of claim 1, it is characterized in that the signal that described broadband amplifying return circuit (1) receives is the analog pal TV signal, perhaps digital DVB-T/DVB-C colour TV signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009203122024U CN201608807U (en) | 2009-10-10 | 2009-10-10 | Multi-mode frequency synthesized electronic turner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009203122024U CN201608807U (en) | 2009-10-10 | 2009-10-10 | Multi-mode frequency synthesized electronic turner |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201608807U true CN201608807U (en) | 2010-10-13 |
Family
ID=42953507
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009203122024U Expired - Fee Related CN201608807U (en) | 2009-10-10 | 2009-10-10 | Multi-mode frequency synthesized electronic turner |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201608807U (en) |
-
2009
- 2009-10-10 CN CN2009203122024U patent/CN201608807U/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 | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20101013 Termination date: 20141010 |
|
| EXPY | Termination of patent right or utility model |