CN108259704A - vehicle-mounted camera video output circuit - Google Patents
vehicle-mounted camera video output circuit Download PDFInfo
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- CN108259704A CN108259704A CN201810247037.2A CN201810247037A CN108259704A CN 108259704 A CN108259704 A CN 108259704A CN 201810247037 A CN201810247037 A CN 201810247037A CN 108259704 A CN108259704 A CN 108259704A
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- 230000000087 stabilizing effect Effects 0.000 claims description 8
- 230000003321 amplification Effects 0.000 abstract description 6
- 238000003199 nucleic acid amplification method Methods 0.000 abstract description 6
- 230000005611 electricity Effects 0.000 description 7
- 230000000694 effects Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/14—Picture signal circuitry for video frequency region
- H04N5/148—Video amplifiers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/14—Picture signal circuitry for video frequency region
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- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Studio Devices (AREA)
Abstract
The embodiment of the invention provides a video output circuit of a vehicle-mounted camera, which comprises an image processor integrated with an operational amplifier, wherein the image processor is provided with a reference voltage pin, a first differential signal pin and a second differential signal pin, the first differential signal pin and the second differential signal pin are used for outputting differential video signals, the first differential signal pin is connected with the anode of a first diode D1, the second differential signal pin is connected with the anode of a second diode D2, the cathodes of the first diode D1 and the second diode D2 are respectively connected with two input ends of a filter module, and two output ends of the filter module are respectively connected with a first differential video signal output end and a second differential video signal output end through a first resistor R1 and a second resistor R2; the reference voltage pin is connected to a third resistor R3 for adjusting the amplification gain of the operational amplifier, and the other end of the third resistor R3 is grounded. According to the embodiment of the invention, the image processor is matched with the corresponding simple circuit to realize the amplification of the differential voltage value, so that an integrated chip of a video amplifier is omitted, and the cost is low.
Description
Technical field
The present embodiments relate to vehicle-mounted camera technical field more particularly to a kind of vehicle-mounted camera video output electricity
Road.
Background technology
At present, vehicle-mounted camera is more and more universal, and entrucking rate is gradually increased.Future, with intelligent automobile and automatic Pilot
Development, each automobile will device more than one auxiliary camera.The output circuit of simulation camera has the video amplifier
Integrated chip for amplified analog signal, while has the function of electrical protection.It is a kind of common video output circuit shown in Fig. 1,
In figure, VON_1 and VOP_1 is ISP respectively（Image Signal Processor, image processor）Output difference vision signal
Positive and negative anodes, signal amplitude is 1Vp-p, through video amplifier integrated chip U2 handle and by difference video signal amplify 2 times, i.e.,
The signal amplitude of N_OUT1 and P_OUT1 is 2Vp-p.If N_OUT1 and P_OUT1 connects display load, outputting standard
CVBS signals.The cost of the existing entire circuit of vehicle-mounted camera is higher and occupies larger PCB surface product, camera shooting area of bed compared with
Greatly, the requirement of miniaturization can not be met.By analysis and ADA4433 databooks are inquired, the video amplifier removes video amplifier
Effect, be also equipped with the safeguard function that two video output terminals of camera are shorted to 12 volts of power supplys, this is that vehicle-mounted camera is electrical
One of performance requirement.
Invention content
Technical problems to be solved of the embodiment of the present invention are, provide a kind of vehicle-mounted camera video output circuit, can be with
Inexpensive mode realizes the amplification to the difference video signal of output.
In order to solve the above technical problems, the embodiment of the present invention uses following technical scheme：A kind of vehicle-mounted camera video is defeated
Go out circuit, the image processor including being integrated with operational amplifier, described image processor has reference voltage pin and use
In the first differential signal pin and the second differential signal pin of output difference vision signal, the first differential signal pin connects
The anode of the first diode D1 is connect, the second differential signal pin connects the anode of the second diode D2, the first diode D1
Connect two input terminals of filter module, two output terminals of the filter module respectively with the cathode of the second diode D2
The first difference video signal output terminal is connected to by first resistor R1 and second resistance R2 respectively again and the second differential video is believed
Number output terminal；The reference voltage pin be connected with for adjust the operational amplifier gain amplifier 3rd resistor R3,
The other end ground connection of 3rd resistor R3.
Further, the vehicle-mounted camera video output circuit further includes the 4th resistance R4 and the 5th resistance R5, wherein,
One end ground connection of the 4th resistance R4 and the other end be connected to the first diode D1 and filter module correspondence input terminal it
Between circuit；One end ground connection of the 5th resistance R5 and the other end is connected to the correspondence of the second diode D2 and filter module
Circuit between input terminal.
Further, the vehicle-mounted camera video output circuit further includes one end ground connection and the other end is connected to the first electricity
Hinder the circuit between R1 and the first difference video signal output terminal the first bi-directional voltage stabilizing diode D3 and one end ground connection and it is another
One end is connected to the second bi-directional voltage stabilizing diode D4 of circuit between second resistance R2 and the second difference video signal output terminal.
Further, the filter module is two-stage Pi mode filters, including the first inductance L1, the second inductance L2, the
Three inductance L3 and the 4th inductance L4, the first capacitance C1, the second capacitance C2, third capacitance C3, wherein, the first inductance L1 and
Three inductance L3 connect and are connected between the cathode of the first diode D1 and first resistor R1, the electricity of the second inductance L2 and the 4th
Sense L4 connects and is connected between the cathode of the second diode D2 and second resistance R2, and the both ends of the first capacitance C1 connect respectively
Connect the cathode of the first diode D1 and the second diode D2, the both ends of the second capacitance C2 be connected to the first inductance L1 and
The circuit between circuit and the second inductance L2 and the 4th inductance L4 between third inductance L3, the both ends of the third capacitance C3
The circuit between circuit and the 4th inductance L4 and the second resistance R2 between third inductance L3 and first resistor R1 is connected respectively.
Further, the vehicle-mounted camera video output circuit further include the first test point TP1, the second test point TP2,
Third test point TP3, the 4th test point TP4, wherein, the first test point TP1 is connected to the anode of the first diode D1, institute
The anode that the second test point TP2 is connected to the second diode D2 is stated, the third test point TP3 is connected to filter module and
Circuit between one resistance R1, the third test point TP3 are connected to the circuit between filter module and second resistance R2.
Using above-mentioned technical proposal, the embodiment of the present invention at least has the advantages that：Institute's embodiment of the present invention is taken
Camera video output circuit video output circuit only with the simple circuit elements device such as filter module, diode, resistance
Part and the image processor cooperation for being integrated with operational amplifier, you can realize the amplification to the difference video signal of output, save
Video amplifier integrated chip saves component cost and simultaneously reduces PCB sizes, and vehicle-mounted using the video output circuit take the photograph
Picture is at low cost, small, can better meet the demand of user.
Description of the drawings
Fig. 1 is a kind of circuit diagram of existing video output circuit.
Fig. 2 is the circuit diagram of vehicle-mounted camera video output circuit one embodiment of the present invention.
Specific embodiment
The present invention is described in further detail in the following with reference to the drawings and specific embodiments.It should be appreciated that following signal
Property embodiment and explanation be only used for explaining the present invention, it is not as a limitation of the invention, moreover, in the absence of conflict,
The feature in embodiment and embodiment in the present invention can be combined with each other.
As shown in Fig. 2, one embodiment of the invention provides a kind of vehicle-mounted camera video output circuit, including being integrated with fortune
Calculate the image processor of amplifier（ISP）, described image processor is with reference voltage pin and for output difference video
The the first differential signal pin and the second differential signal pin of signal, the first differential signal pin connect the first diode D1
Anode, the second differential signal pin connects the anode of the second diode D2, the first diode D1 and the second diode D2
Cathode connect two input terminals of filter module respectively, two output terminals of the filter module pass through first respectively again
Resistance R1 and second resistance R2 is connected to the first difference video signal output terminal N_OUT and the second difference video signal output terminal P_
OUT；The reference voltage pin be connected with for adjust the operational amplifier gain amplifier 3rd resistor R3, third electricity
Hinder the other end ground connection of R3.
The video output circuit of camera video output circuit that the present embodiment is taken is only with filter module, the one or two pole
The simple circuit components such as pipe D1, the second diode D2, first resistor R1, second resistance R2 are with being integrated with operational amplifier
Image processor coordinates, sharp diode unilateral conduction characteristic, realizes circuit reversal connection effect protective effect, setting first resistor R1 and
Second resistance R2 can realize the constant characteristic of output resistance, such as：Constant is 120ohm；ISP is also effectively utilized to be internally integrated
Operational amplifier, by change be connected to ISP reference voltage pins DAC_REF resistance R3 resistance value, so as to effectively change
Become the gain amplifier of operational amplifier, finally make the first difference video signal output terminal N_OUT and the second difference video signal defeated
The difference video signal of outlet P_OUT outputs is amplified, such as：Than the voltage of difference video signal between VON_1 and VOP_1
2 times of value amplification.As it can be seen that the amplification to the difference video signal of output can be realized with simple circuit for the embodiment of the present invention, save
Video amplifier integrated chip is fallen, save component cost and has reduced PCB sizes, using the vehicle-mounted of the video output circuit
Camera is at low cost, small, can better meet the demand of user.
In an alternative embodiment of the invention, the vehicle-mounted camera video output circuit further include the 4th resistance R4 and
5th resistance R5, wherein, one end of the 4th resistance R4 is grounded and the other end is connected to the first diode D1 and wave filter mould
Circuit between the correspondence input terminal of block；The 5th resistance R5 one end ground connection and the other end be connected to the second diode D2 and
Circuit between the correspondence input terminal of filter module.The present embodiment is by further setting the 4th resistance R4 and the 5th resistance
R5 can play the continuous constant effect of video signal transmission impedance, such as：It is constant at 120ohm.
Further, the vehicle-mounted camera video output circuit further includes one end ground connection and the other end is connected to the first electricity
Hinder the first bi-directional voltage stabilizing diode D3 of the circuit between R1 and the first difference video signal output terminal N_OUT and one end ground connection
And the other end is connected to the second bi-directional voltage stabilizing two of circuit between second resistance R2 and the second difference video signal output terminal P_OUT
Pole pipe D4.The present embodiment can cause the by setting the first bi-directional voltage stabilizing diode D3 and the second bi-directional voltage stabilizing diode D4
The electricity of the difference video signal of one difference video signal output terminal N_OUT and the second difference video signal output terminal P_OUT outputs
Pressure value keeps relative stability.
Further, the filter module is two-stage Pi mode filters, including the first inductance L1, the second inductance L2, the
Three inductance L3 and the 4th inductance L4, the first capacitance C1, the second capacitance C2, third capacitance C3, wherein, the first inductance L1 and
Three inductance L3 connect and are connected between the cathode of the first diode D1 and first resistor R1, the electricity of the second inductance L2 and the 4th
Sense L4 connects and is connected between the cathode of the second diode D2 and second resistance R2, and the both ends of the first capacitance C1 connect respectively
Connect the cathode of the first diode D1 and the second diode D2, the both ends of the second capacitance C2 be connected to the first inductance L1 and
The circuit between circuit and the second inductance L2 and the 4th inductance L4 between third inductance L3, the both ends of the third capacitance C3
The circuit between circuit and the 4th inductance L4 and the second resistance R2 between third inductance L3 and first resistor R1 is connected respectively.
The present embodiment forms two-stage Pi mode filters by multiple capacitances and multiple inductor combinations, simply can realize circuit by component
Filtering process.
Further, the vehicle-mounted camera video output circuit further include the first test point TP1, the second test point TP2,
Third test point TP3, the 4th test point TP4, wherein, the first test point TP1 is connected to the anode of the first diode D1, institute
The anode that the second test point TP2 is connected to the second diode D2 is stated, the third test point TP3 is connected to filter module and
Circuit between one resistance R1, the third test point TP3 are connected to the circuit between filter module and second resistance R2.This
Embodiment is by reserved corresponding multiple test points, available for the test in camera industrialized mass production, facilitate test and
Improve manufacture product qualified rate.
It although an embodiment of the present invention has been shown and described, for the ordinary skill in the art, can be with
Understanding without departing from the principles and spirit of the present invention can carry out these embodiments a variety of variations, modification, replace
And modification, the scope of the present invention are limited by appended claims and its equivalency range.
Claims (5)
1. a kind of vehicle-mounted camera video output circuit, the image processor including being integrated with operational amplifier, at described image
Reason utensil has reference voltage pin and for the first differential signal pin of output difference vision signal and the second differential signal
Pin, which is characterized in that the first differential signal pin connects the anode of the first diode D1, and the second differential signal pin connects
Connect the anode of the second diode D2, the cathode of the first diode D1 and the second diode D2 connect filter module respectively
Two input terminals, two output terminals of the filter module are connected to by first resistor R1 and second resistance R2 respectively again
One difference video signal output terminal and the second difference video signal output terminal；The reference voltage pin is connected with for adjusting
State the 3rd resistor R3 of the gain amplifier of operational amplifier, the other end ground connection of 3rd resistor R3.
2. vehicle-mounted camera video output circuit as described in claim 1, which is characterized in that the vehicle-mounted camera video is defeated
Go out circuit and further include the 4th resistance R4 and the 5th resistance R5, wherein, one end of the 4th resistance R4 is grounded and the other end connects
Circuit between the first diode D1 and the correspondence input terminal of filter module；The 5th resistance R5 one end ground connection and it is another
One end is connected to the circuit between the second diode D2 and the correspondence input terminal of filter module.
3. vehicle-mounted camera video output circuit as described in claim 1, which is characterized in that the vehicle-mounted camera video is defeated
Go out that circuit further includes one end ground connection and the other end is connected to line between first resistor R1 and the first difference video signal output terminal
The first bi-directional voltage stabilizing diode D3 on road and one end are grounded and the other end is connected to second resistance R2 and the second differential video letter
Second bi-directional voltage stabilizing diode D4 of circuit between number output terminal.
4. the vehicle-mounted camera video output circuit as described in claims 1 or 2 or 3, which is characterized in that the filter module
For two-stage Pi mode filters, including the first inductance L1, the second inductance L2, third inductance L3 and the 4th inductance L4, the first capacitance C1,
Second capacitance C2, third capacitance C3, wherein, the first inductance L1 and third inductance L3 connect and are connected to the first diode D1
Cathode and first resistor R1 between, the second inductance L2 and the 4th inductance L4 connect and are connected to the negative of the second diode D2
Between pole and second resistance R2, the both ends of the first capacitance C1 connect the negative of the first diode D1 and the second diode D2 respectively
Pole, the both ends of the second capacitance C2 are connected to circuit and the second inductance between the first inductance L1 and third inductance L3
Circuit between L2 and the 4th inductance L4, the both ends of the third capacitance C3 connect respectively third inductance L3 and first resistor R1 it
Between circuit and the 4th inductance L4 and second resistance R2 between circuit.
5. vehicle-mounted camera video output circuit as described in claim 1, which is characterized in that the vehicle-mounted camera video is defeated
Go out circuit and further include the first test point TP1, the second test point TP2, third test point TP3, the 4th test point TP4, wherein, it is described
First test point TP1 is connected to the anode of the first diode D1, and the second test point TP2 is being connected to the second diode D2 just
Pole, the third test point TP3 are connected to the circuit between filter module and first resistor R1, the third test point TP3
The circuit being connected between filter module and second resistance R2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810247037.2A CN108259704B (en) | 2018-03-23 | 2018-03-23 | Video output circuit of vehicle-mounted camera |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810247037.2A CN108259704B (en) | 2018-03-23 | 2018-03-23 | Video output circuit of vehicle-mounted camera |
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| CN108259704A true CN108259704A (en) | 2018-07-06 |
| CN108259704B CN108259704B (en) | 2024-04-30 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN114070228A (en) * | 2021-10-08 | 2022-02-18 | 贵阳顺络迅达电子有限公司 | LTCC electrically tunable filter and manufacturing method thereof |
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| 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 |
| CN114070228A (en) * | 2021-10-08 | 2022-02-18 | 贵阳顺络迅达电子有限公司 | LTCC electrically tunable filter and manufacturing method thereof |
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