CN202940893U - Electronic tuner - Google Patents
Electronic tuner Download PDFInfo
- Publication number
- CN202940893U CN202940893U CN 201220672256 CN201220672256U CN202940893U CN 202940893 U CN202940893 U CN 202940893U CN 201220672256 CN201220672256 CN 201220672256 CN 201220672256 U CN201220672256 U CN 201220672256U CN 202940893 U CN202940893 U CN 202940893U
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- China
- Prior art keywords
- equilibrium
- balance
- signal
- over circuit
- balance change
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- Expired - Lifetime
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Abstract
The utility model relates to an electronic tuner. The technical problem to be solved in the utility model is to provide an electronic tuner which is capable of converting an unbalanced IF signal into a balanced IF signal. The electronic tuner adopts the following technical scheme: the electronic tuner comprises a tuner integrated circuit, and the electronic tuner further comprises a unbalanced-unbalanced conversion circuit and two signal output ends, wherein the tuner integrated circuit is connected with the two signal output ends through the unbalanced-unbalanced conversion circuit. The electronic tuner of the utility model has the following advantages: the balanced IF signal can be outputted, and advantages of low cost, simple structure and easy implementation can be realized. The technical scheme of the utility model is suitable for electronic tuners.
Description
Technical field
The utility model relates to a kind of electronic tuning unit, especially relates to a kind of electronic tuning unit that carries non-equilibrium-balanced signal conversion.
Background technology
Along with the development of technology, TV industry is more and more higher to the requirement of the performance of product and cost.Traditional television set master chip receives non-equilibrium intermediate frequency (IF) signal that electronic tuning unit provides, and now widely used is to receive the also master chip of balance IF signal.
Non-equilibrium IF signal is called again the signal that single-ended IF signal directly is transmitted.Balance IF signal is called again difference IF signal, uses two line signal transmissions, and the amplitude of these two signals equates, single spin-echo.What signal receiving end judged the transmitting terminal transmission by the voltage difference that compares these two signals is logical zero or logical one.By contrast, the television set master chip receives also balance IF signal following advantage: 1. antijamming capability is strong, can more effectively suppress electromagnetic interference (EMI); 2. reduce costs, the sound surface filtering circuit (SAW) that must use in traditional circuit can be integrated in the television set master chip, thereby cancel peripheral filter circuit.
Along with receiving and the applying of the television set master chip of balance IF signal, increasing television set producer requires the electronic tuning unit of its use that balance IF output signal is provided.Yet prior art can not convert non-equilibrium IF signal to the electronic tuning unit of balance IF signal.
Non-equilibrium-balanced to unbalanced transformer part is the equipment that connects non-equilibrium output line and balance output line.Non-equilibrium-balanced to unbalanced transformer part can be a kind of transformer: it can be converted into balanced signal by non-equilibrium signal, and vice versa.Non-equilibrium balanced to unbalanced transformer part non-equilibrium-a pair of non-equilibrium part is arranged in the balance change-over circuit, an end ground connection wherein, other end signal transmission; Also has in addition a pair of balance portion, the electric current numerically equal of two outputs of this part, but single spin-echo.The requirement of non-equilibrium balance change-over circuit most critical is the degree of balance, and whether the two-way output signal level is balanced, relative impedance influences particular importance not between them.Due to the impact of distributed capacitance, have certain insertion loss, fading signal intensity, but can not introduce Noise and Interference, namely to the television set signal to noise ratio, can not produce a very large impact.Non-equilibrium-balanced to unbalanced transformer part is widely used in radio communication and cable communication.
The utility model content
Technical problem to be solved in the utility model is to provide and a kind ofly non-equilibrium IF signal can be converted to the electronic tuning unit of balance IF signal.
The utility model solves the technical scheme that its technical problem adopts: electronic tuning unit, comprise tuner integrated circuit, it is characterized in that, also comprise non-equilibrium-balance change-over circuit and two signal output parts, tuner integrated circuit is connected with two signal output parts by non-equilibrium-balance change-over circuit.
Concrete, described tuner integrated circuit is connected with an end of the non-equilibrium part of non-equilibrium-balance change-over circuit by electric capacity, the other end ground connection of the non-equilibrium part of non-equilibrium-balance change-over circuit; Two outputs of the balance portion of non-equilibrium-balance change-over circuit are connected with two signal output parts respectively.
Preferably, two outputs of the balance portion of non-equilibrium-balance change-over circuit balance portion also join by an electric capacity and ground respectively.
Preferably, non-equilibrium-balance change-over circuit also comprises the electric capacity between two outputs that are parallel to balance portion.
Preferably, non-equilibrium-balance change-over circuit also comprises the resistance between two outputs that are parallel to balance portion.
The beneficial effects of the utility model are: the utility model can be exported balance IF signal, with low cost, simple in structure, is easy to realize.
The accompanying drawing explanation
Fig. 1 is the utility model unit block diagram;
Fig. 2 be the utility model embodiment non-equilibrium-balance converting circuit structure schematic diagram;
Wherein, IF(+) and IF(-) be two signal output parts, C1, C2, C3 and C4 are electric capacity, R is resistance, B is non-equilibrium-balance change-over circuit.
Embodiment
Below in conjunction with drawings and Examples, the utility model is further illustrated.
As Fig. 1, electronic tuning unit, comprise tuner integrated circuit, also comprises non-equilibrium-balance change-over circuit and two signal output parts, and tuner integrated circuit is connected with two signal output parts by non-equilibrium-balance change-over circuit.
-balance conversion non-equilibrium for signal is carried out, described tuner integrated circuit is connected with an end of the non-equilibrium part of non-equilibrium balance change-over circuit by capacitor C 1, the other end ground connection of the non-equilibrium part of non-equilibrium-balance change-over circuit; Two outputs of the balance portion of non-equilibrium-balance change-over circuit B are connected with two signal output parts respectively.
In order to adjust the signal of two output outputs, two outputs of non-equilibrium-balance change-over circuit B balance portion also join by an electric capacity and ground respectively.
In order to meet the requirement of different television set chips, make the utility model can reach optimum performance, non-equilibrium balance change-over circuit also comprises the capacitor C 4 between two outputs that are parallel to balance portion.
In order to meet the requirement of different television set chips, make the utility model can reach optimum performance, non-equilibrium balance change-over circuit also comprises the resistance R between two outputs that are parallel to balance portion.
Embodiment
As Fig. 2, non-equilibrium-balance change-over circuit B comprises that tuner integrated circuit passes through capacitor C 1 and is connected with an end of the non-equilibrium part of non-equilibrium balance change-over circuit, the other end ground connection of the non-equilibrium part of non-equilibrium-balance change-over circuit; Two outputs of the balance portion of non-equilibrium balance change-over circuit B respectively with two signal output part IF(+) and IF(-) be connected.By non-equilibrium-balance conversion, realize the electronic tuning unit IF circuit of balance IF output, by two output IF(+) and IF(-) output two-way balance IF signal.
Two outputs of the balance portion of non-equilibrium-balance change-over circuit B join with ground by capacitor C 2 and capacitor C 3 respectively.Can adjust performance by electric capacity, make output reach optimum state.
In order to meet the requirement of different television set chips, make the utility model can reach optimum performance, non-equilibrium-balance change-over circuit also comprises the capacitor C 4 between two outputs that are parallel to balance portion.
In like manner, non-equilibrium-balance change-over circuit also comprises the resistance R between two outputs that are parallel to balance portion.
The element such as resistance R, electric capacity in circuit, as peripheral match circuit, for the requirement of different television set chips, can carry out different parameter adjustments, to reach best performance.
In relating to concrete tuner product, can compatibility relate to whether applying this non-equilibrium-balance change-over circuit, reach the purpose of the non-equilibrium IF signal of compatible output or balance IF signal.
Claims (6)
1. electronic tuning unit, comprise tuner integrated circuit, it is characterized in that, also comprises non-equilibrium-balance change-over circuit and two signal output parts, and tuner integrated circuit is connected with two signal output parts by non-equilibrium-balance change-over circuit.
2. electronic tuning unit as claimed in claim 1, is characterized in that, described tuner integrated circuit is connected with an end of the non-equilibrium part of non-equilibrium-balance change-over circuit by capacitor C 1, the other end ground connection of the non-equilibrium part of non-equilibrium-balance change-over circuit; Two outputs of the balance portion of non-equilibrium-balance change-over circuit are connected with two signal output parts respectively.
3. electronic tuning unit as claimed in claim 2, is characterized in that, two outputs of non-equilibrium-balance change-over circuit balance portion also join by an electric capacity and ground respectively.
4. electronic tuning unit as claimed in claim 2 or claim 3, is characterized in that, non-equilibrium-balance change-over circuit also comprises the capacitor C 4 between two outputs that are parallel to balance portion.
5. electronic tuning unit as claimed in claim 2 or claim 3, is characterized in that, non-equilibrium-balance change-over circuit also comprises the resistance R between two outputs that are parallel to balance portion.
6. electronic tuning unit as claimed in claim 4, is characterized in that, non-equilibrium-balance change-over circuit also comprises the resistance R between two outputs that are parallel to balance portion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220672256 CN202940893U (en) | 2012-12-07 | 2012-12-07 | Electronic tuner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220672256 CN202940893U (en) | 2012-12-07 | 2012-12-07 | Electronic tuner |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202940893U true CN202940893U (en) | 2013-05-15 |
Family
ID=48325115
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220672256 Expired - Lifetime CN202940893U (en) | 2012-12-07 | 2012-12-07 | Electronic tuner |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202940893U (en) |
-
2012
- 2012-12-07 CN CN 201220672256 patent/CN202940893U/en not_active Expired - Lifetime
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20170925 Address after: 621000 Mianyang city of Sichuan Province, Sichuan Industrial Park, love science and Technology Co. Patentee after: SICHUAN AI-LINK TECHNOLOGY Co.,Ltd. Address before: County 622651 Sichuan city of Mianyang Province Hua Gai Zhen Luo Sheng Jie Sichuan Changhong Electronics Co., Ltd. Patentee before: SICHUAN CHANGHONG ELECTRONIC PARTS Co.,Ltd. |
|
| CP03 | Change of name, title or address | ||
| CP03 | Change of name, title or address |
Address after: 621000 Sichuan Ailian Technology Co.,Ltd., Anzhou Industrial Park, Mianyang City, Sichuan Province Patentee after: Sichuan Ailian Technology Co.,Ltd. Address before: 621000 Mianyang city of Sichuan Province, Sichuan Industrial Park, love science and Technology Co. Patentee before: SICHUAN AI-LINK TECHNOLOGY Co.,Ltd. |
|
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130515 |