CN206004626U - A kind of anti-interference differential amplifier circuit for vehicle-mounted analog video - Google Patents
A kind of anti-interference differential amplifier circuit for vehicle-mounted analog video Download PDFInfo
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- CN206004626U CN206004626U CN201620674089.4U CN201620674089U CN206004626U CN 206004626 U CN206004626 U CN 206004626U CN 201620674089 U CN201620674089 U CN 201620674089U CN 206004626 U CN206004626 U CN 206004626U
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Abstract
The utility model discloses a kind of anti-interference differential amplifier circuit for vehicle-mounted analog video, including video inputs, video output terminals, two groups of electrostatic diodes, two group of first block isolating circuit, the second block isolating circuit, two groups of LC filter circuits, the first operational amplification circuit for lifting the rejection ability to common mode disturbances, the second operational amplification circuit for being used for lifting the first operational amplification circuit zero point and the low-pass filter circuits for filtering the interference signal for being coupling in the first operational amplifier output terminal.The circuit that the utility model is provided has differential input structure, electrostatic diode is arranged in input end is used for electrostatic defending, the preset LC filter circuit of differential signal input front end, for the common mode interference signal for suppressing automotive wire bundle conduction and interior space electromagnetic radiation to produce in input.Amplification circuit output end series connection second order LC low pass filter, filters the interference signal for being coupling in amplifier output end, improves the antijamming capability of circuit.
Description
Technical field
The utility model is related to jamproof differential amplifier circuit, specially a kind of for the anti-interference of vehicle-mounted analog video
Differential amplifier circuit.
Background technology
Modern passenger cars increasingly tend to electronization, and road vehicle component is equipped with ratio more and more higher, the electricity of automotive interior
Magnetic compatible environment tends to complicated, and resulting automotive wire bundle Conduction Interference and electromagnetic radiation are to the anti-dry of road vehicle component
Immunity can propose requirements at the higher level.Automotive entertainment system and advanced DAS (Driver Assistant System) all include the application based on transmission of video,
As vehicle-mounted digital television transmission of video and panorama break the transmission of car system camera video, such application is to supporting in video transmitting procedure
In anti-automobile, the Capability Requirement of electromagnetic interference is very high.The interference free performance of the current differential amplifier circuit for analog video
Difference, it is impossible to meet the requirement of road vehicle component.
Content of the invention
Above-mentioned for solving the problems, such as, the utility model proposes a kind of analog video signal difference with high anti-jamming capacity
Amplifying circuit, specific technical scheme are as follows：
A kind of anti-interference differential amplifier circuit for vehicle-mounted analog video, including video inputs, video output terminals, two
Organize the first block isolating circuit, two group of second block isolating circuit, two groups of LC filter circuits, for lifting to the rejection ability of common mode disturbances
First operational amplification circuit, the second operational amplification circuit for lifting the first operational amplification circuit zero point and for filtering coupling
Low-pass filter circuit in the interference signal of the first operational amplifier output terminal；
Described video inputs are comprising positive input terminal and anti-input；
The in-phase input end of the first described operational amplification circuit and inverting input defeated with the first block isolating circuit respectively
Go out end connection；
The input of the first described block isolating circuit is connected with the output end of LC filter circuit respectively；
Described LC filter circuit is used for filtering common mode interference signal；
The input of described LC filter circuit is connected with the positive input terminal of video and anti-input respectively；
The in-phase input end of the first described operational amplification circuit is also connected with the output end of the second operational amplification circuit；
The output end of the first described operational amplification circuit is connected with the input of the second block isolating circuit；
The output end of the second block isolating circuit is connected with the input of low-pass filter circuit；
The output end of described low-pass filter circuit is connected with video output terminals.
Preferably, two group of first described block isolating circuit is respectively electric capacity C3 and electric capacity C4.
Preferably, also connect respectively between the input of the positive input terminal of described video and anti-input and LC filter circuit
It is connected to the electrostatic diode Z1 and electrostatic diode Z2 of ground connection., protect for electrostatic interference.
Preferably, described LC filter circuit includes inductance L1, inductance L2, electric capacity C1 and electric capacity C2；Described electric capacity C1
One end be connected with the output end of inductance L1, the other end be grounded；One end of described electric capacity C2 is connected with the output end of inductance L2,
The other end is grounded.
Preferably, the first described block isolating circuit includes electric capacity C3 and electric capacity C4；The big ting model and C4 phase of described C3
With.
Preferably, the first described operational amplification circuit includes the first operational amplifier IC1_B, resistance R1, resistance R2, electricity
Resistance R3, resistance R4, resistance R6 and electric capacity C6；
The in-phase input end connection of the output end of resistance R1 and the first operational amplifier IC1_B；
The inverting input connection of the output end of resistance R2 and the first operational amplifier IC1_B；
The in-phase input end of the first described operational amplifier IC1_B is also connected with the input of resistance R3；
The inverting input of the first described operational amplifier IC1_B is also connected with the input of resistance R4；Described electricity
The output end of resistance R4 is connected with the output end of the first described operational amplifier IC1_B；The first described operational amplifier IC1_B
Output end be connected with the input of the second block isolating circuit by resistance R6；Output end string in the first operational amplifier IC1_B
Connection resistance R6, for compensating the capacitive load of output end；
Described electric capacity C6 is connected in parallel on the two ends of resistance R4, for backfeed loop loop compensation, prevents vibration；Described
The in-phase input end of one operational amplification circuit is connected with the output end of the second operational amplification circuit also by resistance R3.
The first described operational amplification circuit is scaling circuit, is balance input structure, is lifted to common mode disturbances
Rejection ability.
Preferably, the resistance of described resistance R1 is identical with resistance R2；The resistance of described resistance R3 is identical with resistance R4.
Preferably, the second described operational amplification circuit include the second operational amplifier IC1_A, power supply VCC, resistance R5,
Resistance R7, resistance R8, resistance R9, electric capacity C5 and electric capacity C8；The input of described resistance R8 and the second operational amplifier IC1_
The power supply VCC connection of A, output end are connected with the in-phase input end of the second operational amplifier IC1_A；One end of described resistance R9
Connect the in-phase input end of the second operational amplifier IC1_A, the other end is grounded；One end of described electric capacity C8 connects the second computing
The in-phase input end of amplifier IC1_A, the other end are grounded；Described resistance R7 is connected in parallel on the second operational amplifier IC1_A output
Between end and inverting input；The output end of the second described operational amplifier IC1_A is by resistance R5 and the first operation amplifier
The in-phase input end connection of circuit；Described resistance R5 is also associated with the electric capacity C5 being grounded.The second described operational amplification circuit
Zero point for lifting operational amplification circuit, it is ensured that circuit normal work under single positive supply condition of power supply.
Preferably, described low-pass filter circuit includes electric capacity C9, electric capacity C10, electric capacity C11, inductance L3 and inductance L4；Institute
The input of the low-pass filter circuit that states is connected with the output end of the second block isolating circuit C7 by inductance L3；Described inductance L3's
Input is also associated with the electric capacity C9 being grounded；The input of described inductance L4 is connected with the output end of inductance L3；Described electricity
The output end of sense L4 is also respectively connected with electric capacity C11 and the video output terminals of ground connection.
The circuit that the utility model is provided has differential input structure, and arranging electrostatic diode in input end is used for electrostatic
Protection, the preset LC filter circuit of differential signal input front end, for suppressing automotive wire bundle conduction and interior space electromagnetic radiation to exist
The common mode interference signal that input is produced.Amplification circuit output end is connected second order LC low pass filter, filters that to be coupling in amplifier defeated
Go out the interference signal at end, improve the antijamming capability of circuit.
Description of the drawings
Fig. 1 is the schematic diagram of the anti-interference differential amplifier circuit for vehicle-mounted analog video of embodiment 1；
Fig. 2 is the schematic diagram of the first operational amplification circuit of embodiment 1；
Fig. 3 is the schematic diagram of the second operational amplification circuit of embodiment 1；
Description of reference numerals：1 is video inputs；2 is electrostatic diode；3 is LC filter circuit；4 is first every straight electricity
Road；5 is the first operational amplification circuit；6 is the second operational amplification circuit；7 is the second block isolating circuit；8 is low-pass filter circuit；9
For video output terminals.
Specific embodiment
For the ease of it will be appreciated by those skilled in the art that entering to advance to the utility model below in conjunction with accompanying drawing and embodiment
One step is described in detail.
Embodiment 1
As shown in figure 1, a kind of anti-interference differential amplifier circuit for vehicle-mounted analog video, including video inputs, regards
Frequency output end, two groups of electrostatic diodes, two group of first block isolating circuit, two group of second block isolating circuit, two groups of LC filter circuits, it is used for
Lift the first operational amplification circuit of the rejection ability to common mode disturbances, be used for the second of lifting the first operational amplification circuit zero point
Operational amplification circuit and the low-pass filter circuit for filtering the interference signal for being coupling in the first operational amplifier output terminal.
Described video inputs are comprising positive input terminal and anti-input.
Two groups of described electrostatic diodes are respectively electrostatic diode Z1 and electrostatic diode Z2, anti-for electrostatic interference
Shield；
Two group of first described block isolating circuit is respectively electric capacity C3 and electric capacity C4.
The second described block isolating circuit is electric capacity C7.
Two groups of described filter circuits are respectively inductance L1, inductance L2, electric capacity C1 and electric capacity C2.
The first described operational amplification circuit includes the first operational amplifier IC1_B, resistance R1, resistance R2, resistance R3, electricity
Resistance R4, resistance R6 and electric capacity C6, the first described operational amplification circuit is scaling circuit, is balance input structure, lifting
Rejection ability to common mode disturbances.
The second described operational amplification circuit include the second operational amplifier IC1_A, power supply VCC, resistance R5, resistance R7,
Resistance R8, resistance R9, electric capacity C5 and electric capacity C8；The second described operational amplification circuit is used for the zero of lifting operational amplification circuit
Point, it is ensured that circuit normal work under single positive supply condition of power supply.
Described low-pass filter circuit includes electric capacity C9, electric capacity C10, electric capacity C11, inductance L3 and inductance L4.
The positive input terminal of described video is connected with one end of electrostatic diode Z1, and described electrostatic diode Z1's is another
End ground connection；One end of described electrostatic diode Z1 is also connected with the input of the inductance L1 in LC filter circuit；Described electricity
The output end of sense L1 is connected with one end of electric capacity C1, and the other end of described electric capacity C1 is grounded；The output end of described inductance L1
Also it is connected with the input of the electric capacity C3 in the first block isolating circuit；The output end of described electric capacity C3 is connected with the input of resistance R1
Connect；The output end of described resistance R1 at the same with the in-phase input end of the first operational amplifier IC1_B and the input of resistance R3
Connection；
The output end of described resistance R3 at the same with the short connection of the input of one end of electric capacity C5 and resistance R5；Described electric capacity
The other end ground connection of C5；The output end of described resistance R5 is connected with the output end of the second operational amplifier IC1_A.
The power supply VCC of the second described operational amplifier IC1_A is connected with the input of resistance R8；Described resistance R8's
Output end is connected with the in-phase input end of the second operational amplifier IC1_A；The homophase of the second described operational amplifier IC1_A is defeated
Enter end also while being connected with one end of electric capacity C8 and one end of resistance R9；The other end of described C8 and another termination of resistance R9
Ground；Described resistance R7 is connected in parallel on the defeated of the inverting input of the second operational amplifier IC1_A and the second operational amplifier IC1_A
Go out between end.
The anti-input of described video is connected with one end of electrostatic diode Z2, and described electrostatic diode Z2's is another
End ground connection；One end of described electrostatic diode Z2 is also connected with the input of the inductance L2 in LC filter circuit；Described electricity
The output end of sense L2 is connected with one end of electric capacity C2, and the other end of described electric capacity C2 is grounded；The output end of described inductance L2
Also it is connected with the input of the electric capacity C4 in the first block isolating circuit；The output end of described electric capacity C4 is connected with the input of resistance R2
Connect；The output end of described resistance R2 is connected with the inverting input of the first operational amplifier IC1_B；Described resistance R4 and electricity
Hold C6 while being connected in parallel between inverting input and the output end of the first operational amplifier IC1_B；The application using electric capacity C6 across
Inverting input and the output end of the first operational amplifier IC1_B is connected to, for backfeed loop loop compensation, prevents vibration.
The output end of the first described operational amplifier IC1_B is also connected with the input of resistance R6；Described resistance R6
Output end be connected with the input of the electric capacity C7 of second block isolating circuit；The application is defeated the first operational amplifier IC1_B's
Go out to hold series resistance R6, for compensating the capacitive load of output end.
The output end of described electric capacity C7 is while be connected with the input of electric capacity C9 one end and inductance L3；Described electric capacity C9
The other end ground connection；The output end of described inductance L3 is while be connected with one end of electric capacity C10 and the input of inductance L4；Described
Electric capacity C10 the other end ground connection；The output end of described inductance L4 one end and video output terminals company simultaneously with electric capacity C11
Connect；The other end ground connection of described electric capacity C11.
The circuit that the utility model is provided has differential input structure, and arranging electrostatic diode in input end is used for electrostatic
Protection, the preset LC filter circuit of differential signal input front end, for suppressing automotive wire bundle conduction and interior space electromagnetic radiation to exist
The common mode interference signal that input is produced.Amplification circuit output end is connected second order LC low pass filter, filters that to be coupling in amplifier defeated
Go out the interference signal at end, improve the antijamming capability of circuit.
It is wherein specific implementation of the present utility model above, therefore its description is more concrete and detailed, but can not be
And the restriction being interpreted as to the utility model the scope of the claims.It should be pointed out that for the person of ordinary skill of the art,
Without departing from the concept of the premise utility, some deformation and improvement can also be made, these obviously replace shape
Formula belongs to protection domain of the present utility model.
Claims (8)
1. a kind of anti-interference differential amplifier circuit for vehicle-mounted analog video, it is characterised in that including video inputs, video
Output end, two group of first block isolating circuit, the second block isolating circuit, two groups of LC filter circuits, the suppression for lifting to common mode disturbances
First operational amplification circuit of ability, the second operational amplification circuit for lifting the first operational amplification circuit zero point and for filtering
Low-pass filter circuit except the interference signal for being coupling in the first operational amplifier output terminal；
Described video inputs are comprising positive input terminal and anti-input；
The in-phase input end and inverting input of the first described operational amplification circuit output end respectively with the first block isolating circuit
Connection；
The input of the first described block isolating circuit is connected with the output end of LC filter circuit respectively；
Described LC filter circuit is used for filtering common mode interference signal；
The input of described LC filter circuit is connected with the positive input terminal of video and anti-input respectively；
The in-phase input end of the first described operational amplification circuit is also connected with the output end of the second operational amplification circuit；
The output end of the first described operational amplification circuit is connected with the input of the second block isolating circuit；
The output end of the second block isolating circuit is connected with the input of low-pass filter circuit；
The output end of described low-pass filter circuit is connected with video output terminals.
2. the anti-interference differential amplifier circuit for vehicle-mounted analog video according to claim 1, it is characterised in that：Described
Two group of first block isolating circuit be respectively electric capacity C3 and electric capacity C4.
3. the anti-interference differential amplifier circuit for vehicle-mounted analog video according to claim 1, it is characterised in that：Described
The positive input terminal of video and the input of anti-input and LC filter circuit between be also respectively connected with two pole of electrostatic of ground connection
Pipe Z1 and electrostatic diode Z2.
4. the anti-interference differential amplifier circuit for vehicle-mounted analog video according to claim 1, it is characterised in that：Described
LC filter circuit include inductance L1, inductance L2, electric capacity C1 and electric capacity C2；One end of described electric capacity C1 and the output of inductance L1
End connection, the other end are grounded；One end of described electric capacity C2 is connected with the output end of inductance L2, and the other end is grounded.
5. the anti-interference differential amplifier circuit for vehicle-mounted analog video according to claim 1, it is characterised in that：Described
The first operational amplification circuit include the first operational amplifier IC1_B, resistance R1, resistance R2, resistance R3, resistance R4, resistance R6
With electric capacity C6；
The in-phase input end connection of the output end of resistance R1 and the first operational amplifier IC1_B；
The inverting input connection of the output end of resistance R2 and the first operational amplifier IC1_B；
The in-phase input end of the first described operational amplifier IC1_B is also connected with the input of resistance R3；
The inverting input of the first described operational amplifier IC1_B is also connected with the input of resistance R4；Described resistance R4
Output end be connected with the output end of the first described operational amplifier IC1_B；The first described operational amplifier IC1_B's is defeated
Go out end to be connected with the input of the second block isolating circuit by resistance R6；Described electric capacity C6 is connected in parallel on the two ends of resistance R4；Described
The in-phase input end of the first operational amplification circuit be connected with the output end of the second operational amplification circuit also by resistance R3.
6. the anti-interference differential amplifier circuit for vehicle-mounted analog video according to claim 5, it is characterised in that：Described
Resistance R1 resistance identical with resistance R2；The resistance of described resistance R3 is identical with resistance R4.
7. the anti-interference differential amplifier circuit for vehicle-mounted analog video according to claim 1, it is characterised in that：Described
The second operational amplification circuit include the second operational amplifier IC1_A, power supply VCC, resistance R5, resistance R7, resistance R8, resistance
R9, electric capacity C5 and electric capacity C8；The input of described resistance R8 is connected with the power supply VCC of the second operational amplifier IC1_A, output
End is connected with the in-phase input end of the second operational amplifier IC1_A；One end of described resistance R9 connects the second operational amplifier
The in-phase input end of IC1_A, the other end are grounded；One end of described electric capacity C8 connects the homophase of the second operational amplifier IC1_A
Input, the other end are grounded；Described resistance R7 be connected in parallel on the second operational amplifier IC1_A output end and inverting input it
Between；The output end of the second described operational amplifier IC1_A is by resistance R5 and the in-phase input end of the first operational amplification circuit
Connection；Described resistance R5 is also associated with the electric capacity C5 being grounded.
8. the anti-interference differential amplifier circuit for vehicle-mounted analog video according to claim 1, it is characterised in that：Described
Low-pass filter circuit include electric capacity C9, electric capacity C10, electric capacity C11, inductance L3 and inductance L4；Described low-pass filter circuit
Input is connected with the output end of the second block isolating circuit C7 by inductance L3；The input of described inductance L3 is also associated with ground connection
Electric capacity C9；The input of described inductance L4 is connected with the output end of inductance L3；The output end of described inductance L4 is also distinguished
It is connected with electric capacity C11 and the video output terminals of ground connection.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201620674089.4U CN206004626U (en) | 2016-06-30 | 2016-06-30 | A kind of anti-interference differential amplifier circuit for vehicle-mounted analog video |
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| CN201620674089.4U CN206004626U (en) | 2016-06-30 | 2016-06-30 | A kind of anti-interference differential amplifier circuit for vehicle-mounted analog video |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107021035A (en) * | 2017-03-24 | 2017-08-08 | 青岛海信电器股份有限公司 | Vehicular display device and in-vehicle display system |
| CN108259704A (en) * | 2018-03-23 | 2018-07-06 | 深圳市豪恩汽车电子装备股份有限公司 | vehicle-mounted camera video output circuit |
| CN108768397A (en) * | 2018-06-01 | 2018-11-06 | 珠海格力电器股份有限公司 | Bipolar sampling circuit capable of realizing zero offset linearization |
| CN109525750A (en) * | 2018-12-03 | 2019-03-26 | 深圳市车联天下信息科技有限公司 | Vehicle-mounted back-up video circuit and control method |
| CN109743474A (en) * | 2019-03-18 | 2019-05-10 | 延锋伟世通电子科技（上海）有限公司 | A kind of single-ended camera signals processing circuit of highly resistance immunity |
| CN109802748A (en) * | 2019-03-18 | 2019-05-24 | 延锋伟世通电子科技（上海）有限公司 | A kind of highly resistance immunity difference camera signals processing circuit |
| CN110324759A (en) * | 2019-06-12 | 2019-10-11 | 深圳市金锐显数码科技有限公司 | Voice sound equipment pickup circuit and device |
| CN114551426A (en) * | 2022-02-10 | 2022-05-27 | 成都明夷电子科技有限公司 | Trans-impedance amplifier chip with WiFi interference signal capability and packaging method thereof |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107021035A (en) * | 2017-03-24 | 2017-08-08 | 青岛海信电器股份有限公司 | Vehicular display device and in-vehicle display system |
| CN108259704A (en) * | 2018-03-23 | 2018-07-06 | 深圳市豪恩汽车电子装备股份有限公司 | vehicle-mounted camera video output circuit |
| CN108259704B (en) * | 2018-03-23 | 2024-04-30 | 深圳市豪恩汽车电子装备股份有限公司 | Video output circuit of vehicle-mounted camera |
| CN108768397A (en) * | 2018-06-01 | 2018-11-06 | 珠海格力电器股份有限公司 | Bipolar sampling circuit capable of realizing zero offset linearization |
| CN109525750A (en) * | 2018-12-03 | 2019-03-26 | 深圳市车联天下信息科技有限公司 | Vehicle-mounted back-up video circuit and control method |
| CN109743474A (en) * | 2019-03-18 | 2019-05-10 | 延锋伟世通电子科技（上海）有限公司 | A kind of single-ended camera signals processing circuit of highly resistance immunity |
| CN109802748A (en) * | 2019-03-18 | 2019-05-24 | 延锋伟世通电子科技（上海）有限公司 | A kind of highly resistance immunity difference camera signals processing circuit |
| CN109743474B (en) * | 2019-03-18 | 2023-04-25 | 延锋伟世通电子科技（上海）有限公司 | High-noise-immunity single-ended camera signal processing circuit |
| CN109802748B (en) * | 2019-03-18 | 2023-08-25 | 延锋伟世通电子科技（上海）有限公司 | High-immunity differential camera signal processing circuit |
| CN110324759A (en) * | 2019-06-12 | 2019-10-11 | 深圳市金锐显数码科技有限公司 | Voice sound equipment pickup circuit and device |
| CN110324759B (en) * | 2019-06-12 | 2024-06-04 | 深圳市金锐显数码科技有限公司 | Voice sound pickup circuit and device |
| CN114551426A (en) * | 2022-02-10 | 2022-05-27 | 成都明夷电子科技有限公司 | Trans-impedance amplifier chip with WiFi interference signal capability and packaging method thereof |
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