CN203590188U - Switching circuit - Google Patents
Switching circuit Download PDFInfo
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- CN203590188U CN203590188U CN201320775291.2U CN201320775291U CN203590188U CN 203590188 U CN203590188 U CN 203590188U CN 201320775291 U CN201320775291 U CN 201320775291U CN 203590188 U CN203590188 U CN 203590188U
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- triode
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- agc
- collector electrode
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Abstract
The utility model discloses a switch circuit, including voltage control end SEL _ IF _ AGC, first resistance R1, second resistance R2, third resistance R3, fourth resistance R4, fifth resistance R5, sixth resistance R6, first triode Q1, second triode Q2, third triode Q3, fourth triode Q4, first signal input part T _ IF _ AGC, second signal input part T2_ IF _ AGC and signal output part TDA _ IF _ AGC; one end of a sixth resistor R6 is connected with the collector of the second triode Q2, and the other end of the sixth resistor R6 is connected with the base of the fourth triode Q4; an emitter of the fourth transistor Q4 is connected to the second signal input terminal T2_ IF _ AGC, and a collector of the fourth transistor Q4 is connected to the signal output terminal TDA _ IF _ AGC. The utility model discloses a four triodes realize the select function to two way analog signal, and the circuit is simple.
Description
Technical field
The utility model relates to electronic technology field, relates in particular to a kind of switching circuit.
Background technology
In present transistor switching circuit, be generally to utilize two triodes to control a railway digital signal, as shown in Figure 1, the operation principle of this circuit is as follows:
When voltage controling end POW_EN high input voltage, the first triode QE21 conducting, thereby the second triode QE22 conducting, the voltage at voltage controling end PW_ON place approximates SW terminal voltage; When voltage controling end POW_EN input low-voltage, the first triode QE21 cut-off, the second triode QE22 cut-off, the voltage at voltage controling end PW_ON place is 0.
If to two paths of signals gating, need two circuit shown in Fig. 1, and then just need two-way voltage control signal, make the utilance of I/O low, production cost is also higher.
Summary of the invention
Technical problem to be solved in the utility model is, a kind of switching circuit is provided, and by four triodes, realizes the selection function to two-way analog signal, and circuit is simple, with low cost and functional.
For solving above technical problem, the utility model embodiment provides a kind of switching circuit, comprises voltage controling end SEL_IF_AGC, the first resistance R 1, the second resistance R 2, the 3rd resistance R 3, the 4th resistance R 4, the 5th resistance R 5, the 6th resistance R 6, the first triode Q1, the second triode Q2, the 3rd triode Q3, the 4th triode Q4, first signal input T_IF_AGC, secondary signal input T2_IF_AGC and signal output part TDA_IF_AGC;
One end of described the second resistance R 2 is connected with described voltage controling end SEL_IF_AGC, and the other end of described the second resistance R 2 is connected with the base stage of described the second triode Q2; The collector electrode of described the second triode Q2 is connected with one end of described the 4th resistance R 4, and the other end of described the 4th resistance R 4 is connected with power supply 3V3_Tun; The grounded emitter of described the second triode Q2;
One end of described the 6th resistance R 6 is connected with the collector electrode of described the second triode Q2, and the other end of described the 6th resistance R 6 is connected with the base stage of described the 4th triode Q4; The emitter of described the 4th triode Q4 is connected with described secondary signal input T2_IF_AGC, and the collector electrode of described the 4th triode Q4 is connected with described signal output part TDA_IF_AGC;
One end of described the first resistance R 1 is connected with the collector electrode of described the second triode Q2, and the other end of described the first resistance R 1 is connected with the base stage of described the first triode Q1; The collector electrode of described the first triode Q1 is connected with one end of described the 3rd resistance R 3, and the other end of described the 3rd resistance R 3 is connected with power supply 3V3_Tun; The grounded emitter of described the first triode Q1;
One end of described the 5th resistance R 5 is connected with the collector electrode of described the first triode Q1, and the other end of described the 5th resistance R 5 is connected with the base stage of described the 3rd triode Q3; The emitter of described the 3rd triode Q3 is connected with described first signal input T_IF_AGC, and the collector electrode of described the 3rd triode Q3 is connected with described signal output part TDA_IF_AGC.
Implement the utility model embodiment, there is following beneficial effect: by four triodes, realize the selection function to two-way analog signal, circuit is simple, with low cost and functional.
Accompanying drawing explanation
Fig. 1 is the structural representation of switching circuit of the prior art;
Fig. 2 is the structural representation of an embodiment of the switching circuit that provides of the utility model.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the utility model embodiment is clearly and completely described.
Referring to Fig. 2, it is the structural representation of an embodiment of the switching circuit that provides of the utility model.
The present embodiment provides a kind of switching circuit, comprises voltage controling end SEL_IF_AGC, the first resistance R 1, the second resistance R 2, the 3rd resistance R 3, the 4th resistance R 4, the 5th resistance R 5, the 6th resistance R 6, the first triode Q1, the second triode Q2, the 3rd triode Q3, the 4th triode Q4, first signal input T_IF_AGC, secondary signal input T2_IF_AGC and signal output part TDA_IF_AGC;
One end of the second resistance R 2 is connected with voltage controling end SEL_IF_AGC, and the other end of the second resistance R 2 is connected with the base stage of the second triode Q2; The collector electrode of the second triode Q2 is connected with one end of the 4th resistance R 4, and the other end of the 4th resistance R 4 is connected with power supply 3V3_Tun; The grounded emitter of the second triode Q2;
One end of the 6th resistance R 6 is connected with the collector electrode of the second triode Q2, and the other end of the 6th resistance R 6 is connected with the base stage of the 4th triode Q4; The emitter of the 4th triode Q4 is connected with secondary signal input T2_IF_AGC, and the collector electrode of the 4th triode Q4 is connected with signal output part TDA_IF_AGC;
One end of the first resistance R 1 is connected with the collector electrode of the second triode Q2, and the other end of the first resistance R 1 is connected with the base stage of the first triode Q1; The collector electrode of the first triode Q1 is connected with one end of the 3rd resistance R 3, and the other end of the 3rd resistance R 3 is connected with power supply 3V3_Tun; The grounded emitter of the first triode Q1;
One end of the 5th resistance R 5 is connected with the collector electrode of the first triode Q1, and the other end of the 5th resistance R 5 is connected with the base stage of the 3rd triode Q3; The emitter of the 3rd triode Q3 is connected with first signal input T_IF_AGC, and the collector electrode of the 3rd triode Q3 is connected with signal output part TDA_IF_AGC.
Preferably, the first triode Q1 and the second triode Q2 are NPN type triode, and the 3rd triode Q3 and the 4th triode Q4 are positive-negative-positive triode.
The operation principle of the drive circuit below the utility model being provided is elaborated.
When voltage controling end SEL_IF_AGC input high level, the second triode Q2 conducting, thereby the 4th triode Q4 conducting, the first triode Q1 and the 3rd triode Q3 cut-off, the voltage of signal output part TDA_IF_AGC equals the voltage of secondary signal input T2_IF_AGC; When voltage controling end SEL_IF_AGC input low level, the second triode Q2 cut-off, thereby the 4th triode Q4 cut-off, the first triode Q1 and the 3rd triode Q3 conducting, the voltage of signal output part TDA_IF_AGC equals the voltage of first signal input T_IF_AGC.
It should be noted that, the voltage of secondary signal input T2_IF_AGC must be greater than the conducting voltage of the 4th triode Q4, makes signal from secondary signal input T2_IF_AGC to signal output part TDA_IF_AGC one-way conduction.The voltage of first signal input T_IF_AGC must be greater than the conducting voltage of the 3rd triode Q3, makes signal from first signal input T_IF_AGC to signal output part TDA_IF_AGC one-way conduction.
The switching circuit that the utility model embodiment provides, can realize the selection function to two-way analog signal by four triodes, and circuit is simple, with low cost and functional.
The above is preferred implementation of the present utility model; it should be pointed out that for those skilled in the art, do not departing under the prerequisite of the utility model principle; can also make some improvements and modifications, these improvements and modifications are also considered as protection range of the present utility model.
Claims (2)
1. a switching circuit, it is characterized in that, comprise voltage controling end SEL_IF_AGC, the first resistance R 1, the second resistance R 2, the 3rd resistance R 3, the 4th resistance R 4, the 5th resistance R 5, the 6th resistance R 6, the first triode Q1, the second triode Q2, the 3rd triode Q3, the 4th triode Q4, first signal input T_IF_AGC, secondary signal input T2_IF_AGC and signal output part TDA_IF_AGC;
One end of described the second resistance R 2 is connected with described voltage controling end SEL_IF_AGC, and the other end of described the second resistance R 2 is connected with the base stage of described the second triode Q2; The collector electrode of described the second triode Q2 is connected with one end of described the 4th resistance R 4, and the other end of described the 4th resistance R 4 is connected with power supply 3V3_Tun; The grounded emitter of described the second triode Q2;
One end of described the 6th resistance R 6 is connected with the collector electrode of described the second triode Q2, and the other end of described the 6th resistance R 6 is connected with the base stage of described the 4th triode Q4; The emitter of described the 4th triode Q4 is connected with described secondary signal input T2_IF_AGC, and the collector electrode of described the 4th triode Q4 is connected with described signal output part TDA_IF_AGC;
One end of described the first resistance R 1 is connected with the collector electrode of described the second triode Q2, and the other end of described the first resistance R 1 is connected with the base stage of described the first triode Q1; The collector electrode of described the first triode Q1 is connected with one end of described the 3rd resistance R 3, and the other end of described the 3rd resistance R 3 is connected with power supply 3V3_Tun; The grounded emitter of described the first triode Q1;
One end of described the 5th resistance R 5 is connected with the collector electrode of described the first triode Q1, and the other end of described the 5th resistance R 5 is connected with the base stage of described the 3rd triode Q3; The emitter of described the 3rd triode Q3 is connected with described first signal input T_IF_AGC, and the collector electrode of described the 3rd triode Q3 is connected with described signal output part TDA_IF_AGC.
2. switching circuit as claimed in claim 1, is characterized in that, described the first triode Q1 and described the second triode Q2 are NPN type triode, and described the 3rd triode Q3 and the 4th triode Q4 are positive-negative-positive triode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320775291.2U CN203590188U (en) | 2013-11-29 | 2013-11-29 | Switching circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320775291.2U CN203590188U (en) | 2013-11-29 | 2013-11-29 | Switching circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203590188U true CN203590188U (en) | 2014-05-07 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320775291.2U Expired - Lifetime CN203590188U (en) | 2013-11-29 | 2013-11-29 | Switching circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203590188U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108924458A (en) * | 2018-08-06 | 2018-11-30 | 青岛海信电器股份有限公司 | For EDID data rewriting method, device and display terminal with HDMI extended channel |
| CN109450434A (en) * | 2018-12-14 | 2019-03-08 | 东莞博力威电池有限公司 | A kind of dual-channel analog selection circuit |
-
2013
- 2013-11-29 CN CN201320775291.2U patent/CN203590188U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108924458A (en) * | 2018-08-06 | 2018-11-30 | 青岛海信电器股份有限公司 | For EDID data rewriting method, device and display terminal with HDMI extended channel |
| CN108924458B (en) * | 2018-08-06 | 2021-12-07 | 海信视像科技股份有限公司 | EDID data rewriting method and device for HDMI extended channel and display terminal |
| CN109450434A (en) * | 2018-12-14 | 2019-03-08 | 东莞博力威电池有限公司 | A kind of dual-channel analog selection circuit |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140507 |
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| CX01 | Expiry of patent term |