CN108259704B - Video output circuit of vehicle-mounted camera - Google Patents
Video output circuit of vehicle-mounted camera Download PDFInfo
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- CN108259704B CN108259704B CN201810247037.2A CN201810247037A CN108259704B CN 108259704 B CN108259704 B CN 108259704B CN 201810247037 A CN201810247037 A CN 201810247037A CN 108259704 B CN108259704 B CN 108259704B
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- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 7
- 238000012360 testing method Methods 0.000 claims description 27
- 239000003990 capacitor Substances 0.000 claims description 18
- 230000002457 bidirectional effect Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
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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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Abstract
The embodiment of the invention provides a vehicle-mounted camera video output circuit, 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, wherein 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 positive electrode of a first diode D1, the second differential signal pin is connected with the positive electrode of a second diode D2, the negative electrodes of the first diode D1 and the second diode D2 are respectively connected with two input ends of a filter module, and the two output ends of the filter module are respectively connected to the first differential video signal output end and the second differential video signal output end through a first resistor R1 and a second resistor R2; the reference voltage pin is connected with 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 differential voltage value can be amplified by matching the image processor with a corresponding simple circuit, so that a video amplifier integrated chip is omitted, and the cost is low.
Description
Technical Field
The embodiment of the invention relates to the technical field of vehicle-mounted cameras, in particular to a video output circuit of a vehicle-mounted camera.
Background
At present, vehicle-mounted cameras are becoming more and more popular, and the loading rate is gradually improved. In the future, with the development of intelligent automobiles and automatic driving, more than one auxiliary camera is arranged on each automobile. The output circuits of the analog cameras are all provided with video amplifier integrated chips for amplifying analog signals, and have an electric protection function. Fig. 1 shows a conventional video output circuit, in which von_1 and vop_1 are positive and negative poles of an ISP (IMAGE SIGNAL Processor) to output a differential video signal, the signal amplitude is 1Vp-P, and the differential video signal is amplified by 2 times by processing the signal amplitude of n_out1 and p_out1 through a video amplifier integrated chip U2, that is, the signal amplitude of n_out1 and p_out1 is 2Vp-P. If N_OUT1 and P_OUT1 are connected to the display load, a standard CVBS signal is output. The cost of the whole circuit of the existing vehicle-mounted camera is high, the occupied PCB area is large, the size of the camera is large, and the miniaturization requirement cannot be met. Through analysis and inquiry ADA4433 data manual, the video amplifier has the function of video amplification and also has the protection function of shorting two video output ends of the camera to a 12-volt power supply, which is one of the electrical performance requirements of the vehicle-mounted camera.
Disclosure of Invention
The technical problem to be solved by the embodiment of the invention is to provide the video output circuit of the vehicle-mounted camera, which can amplify the output differential video signals in a low-cost mode.
In order to solve the technical problems, the embodiment of the invention adopts the following technical scheme: the video output circuit of the vehicle-mounted camera 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, wherein 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 positive electrode of a first diode D1, the second differential signal pin is connected with the positive electrode of a second diode D2, the negative electrodes of the first diode D1 and the second diode D2 are respectively connected with two input ends of a filter module, and the two output ends of the filter module are respectively connected to the first differential video signal output end and the second differential video signal output end through a first resistor R1 and a second resistor R2; the reference voltage pin is connected with a third resistor R3 for adjusting the amplification gain of the operational amplifier, and the other end of the third resistor R3 is grounded.
Further, the vehicle-mounted camera video output circuit further comprises a fourth resistor R4 and a fifth resistor R5, wherein one end of the fourth resistor R4 is grounded, and the other end of the fourth resistor R4 is connected to a line between the first diode D1 and a corresponding input end of the filter module; one end of the fifth resistor R5 is grounded and the other end is connected to a line between the second diode D2 and the corresponding input of the filter module.
Further, the video output circuit of the vehicle-mounted camera further comprises a first bidirectional zener diode D3 with one end grounded and the other end connected to a line between the first resistor R1 and the first differential video signal output end, and a second bidirectional zener diode D4 with one end grounded and the other end connected to a line between the second resistor R2 and the second differential video signal output end.
Further, the filter module is a two-stage Pi-type filter, and includes a first inductor L1, a second inductor L2, a third inductor L3, a fourth inductor L4, a first capacitor C1, a second capacitor C2, and a third capacitor C3, where the first inductor L1 and the third inductor L3 are connected in series and between a negative electrode of the first diode D1 and the first resistor R1, the second inductor L2 and the fourth inductor L4 are connected in series and between a negative electrode of the second diode D2 and the second resistor R2, two ends of the first capacitor C1 are connected with the negative electrode of the first diode D1 and the second diode D2 respectively, two ends of the second capacitor C2 are connected with a line between the first inductor L1 and the third inductor L3 and a line between the second inductor L2 and the fourth inductor L4 respectively, and two ends of the third capacitor C3 are connected with a line between the third inductor L3 and the first resistor R1 and a line between the fourth inductor L4 and the second resistor R2 respectively.
Further, the video output circuit of the vehicle-mounted camera further comprises a first test point TP1, a second test point TP2, a third test point TP3 and a fourth test point TP4, wherein the first test point TP1 is connected to the positive electrode of the first diode D1, the second test point TP2 is connected to the positive electrode of the second diode D2, the third test point TP3 is connected to a circuit between the filter module and the first resistor R1, and the third test point TP3 is connected to a circuit between the filter module and the second resistor R2.
By adopting the technical scheme, the embodiment of the invention has at least the following beneficial effects: the video output circuit of the camera video output circuit adopted by the embodiment of the invention can amplify the output differential video signal by only matching simple circuit components such as a filter module, a diode, a resistor and the like with the image processor integrated with the operational amplifier, thereby saving a video amplifier integrated chip, saving the cost of the components and reducing the size of a PCB.
Drawings
Fig. 1 is a circuit diagram of a conventional video output circuit.
Fig. 2 is a circuit diagram of one embodiment of the video output circuit of the in-vehicle camera of the present invention.
Detailed Description
The invention will be described in further detail with reference to the drawings and the specific examples. It should be understood that the following exemplary embodiments and descriptions are only for the purpose of illustrating the invention and are not to be construed as limiting the invention, and that the embodiments and features of the embodiments of the invention may be combined with one another without conflict.
As shown in fig. 2, an embodiment of the present invention provides a video output circuit of a vehicle camera, including an image processor (ISP) integrated with an operational amplifier, the image processor having a reference voltage pin, and a first differential signal pin and a second differential signal pin for outputting a differential video signal, the first differential signal pin being connected to an anode of a first diode D1, the second differential signal pin being connected to an anode of a second diode D2, cathodes of the first diode D1 and the second diode D2 being connected to two input terminals of a filter module, respectively, the two output terminals of the filter module being connected to a first differential video signal output terminal n_out and a second differential video signal output terminal p_out through a first resistor R1 and a second resistor R2, respectively; the reference voltage pin is connected with a third resistor R3 for adjusting the amplification gain of the operational amplifier, and the other end of the third resistor R3 is grounded.
The video output circuit of the camera video output circuit adopted in this embodiment is only matched with the image processor integrated with the operational amplifier by using simple circuit components such as a filter module, a first diode D1, a second diode D2, a first resistor R1, a second resistor R2 and the like, and utilizes the unidirectional conduction characteristic of the diode to realize the protection effect of reverse connection of the circuit, and the arrangement of the first resistor R1 and the second resistor R2 can realize the characteristic of constant output resistance, for example: constant at 120ohm; the operational amplifier integrated inside the ISP is effectively utilized, and the amplification gain of the operational amplifier can be effectively changed by changing the resistance value of the resistor R3 connected to the ISP reference voltage pin dac_ref, so that the differential video signals output by the first differential video signal output terminal n_out and the second differential video signal output terminal p_out are amplified, for example: the voltage value of the differential video signal is amplified by 2 times than that between von_1 and vop_1. Therefore, the embodiment of the invention can amplify the output differential video signal by a simple circuit, omits a video amplifier integrated chip, saves the cost of components and reduces the size of a PCB, and the vehicle-mounted camera adopting the video output circuit has low cost and small volume and can better meet the requirements of users.
In an alternative embodiment of the present invention, the video output circuit of the vehicle-mounted camera further includes a fourth resistor R4 and a fifth resistor R5, where one end of the fourth resistor R4 is grounded and the other end is connected to a line between the first diode D1 and the corresponding input terminal of the filter module; one end of the fifth resistor R5 is grounded and the other end is connected to a line between the second diode D2 and the corresponding input of the filter module. The present embodiment can play a role in continuously constant video signal transmission impedance by further providing the fourth resistor R4 and the fifth resistor R5, for example: constant at 120ohm.
Further, the video output circuit of the vehicle-mounted camera further comprises a first bidirectional zener diode D3 with one end grounded and the other end connected to a line between the first resistor R1 and the first differential video signal output terminal n_out, and a second bidirectional zener diode D4 with one end grounded and the other end connected to a line between the second resistor R2 and the second differential video signal output terminal p_out. The voltage values of the differential video signals output by the first differential video signal output terminal n_out and the second differential video signal output terminal p_out can be kept relatively stable by providing the first diac D3 and the second diac D4.
Further, the filter module is a two-stage Pi-type filter, and includes a first inductor L1, a second inductor L2, a third inductor L3, a fourth inductor L4, a first capacitor C1, a second capacitor C2, and a third capacitor C3, where the first inductor L1 and the third inductor L3 are connected in series and between a negative electrode of the first diode D1 and the first resistor R1, the second inductor L2 and the fourth inductor L4 are connected in series and between a negative electrode of the second diode D2 and the second resistor R2, two ends of the first capacitor C1 are connected with the negative electrode of the first diode D1 and the second diode D2 respectively, two ends of the second capacitor C2 are connected with a line between the first inductor L1 and the third inductor L3 and a line between the second inductor L2 and the fourth inductor L4 respectively, and two ends of the third capacitor C3 are connected with a line between the third inductor L3 and the first resistor R1 and a line between the fourth inductor L4 and the second resistor R2 respectively. In the embodiment, the two-stage Pi type filter is formed by combining a plurality of capacitors and a plurality of inductors, so that the circuit filtering processing can be realized by simple components.
Further, the video output circuit of the vehicle-mounted camera further comprises a first test point TP1, a second test point TP2, a third test point TP3 and a fourth test point TP4, wherein the first test point TP1 is connected to the positive electrode of the first diode D1, the second test point TP2 is connected to the positive electrode of the second diode D2, the third test point TP3 is connected to a circuit between the filter module and the first resistor R1, and the third test point TP3 is connected to a circuit between the filter module and the second resistor R2. The embodiment can be used for testing in the industrialized mass production of the cameras by reserving a plurality of corresponding test points, is convenient for testing and improves the qualification rate of finished products from factories.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the spirit and scope of the invention as defined by the appended claims and their equivalents.
Claims (5)
1. The vehicle-mounted camera video output circuit comprises an image processor ISP integrated with an operational amplifier, wherein the image processor ISP is provided with a reference voltage pin DAC_REF, a first differential signal pin and a second differential signal pin, wherein 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 positive electrode of a first diode D1, the second differential signal pin is connected with the positive electrode of a second diode D2, the negative electrodes of the first diode D1 and the second diode D2 are respectively connected with two input ends of a filter module, and the two output ends of the filter module are respectively connected to 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 dac_ref is connected to a third resistor R3 for adjusting the amplification gain of the operational amplifier, the other end of the third resistor R3 is grounded, and the amplification gain of the operational amplifier is changed by changing the resistance value of the third resistor R3 connected to the reference voltage pin dac_ref of the image processor ISP, so that the differential video signals output by the first differential signal pin and the second differential signal pin are amplified.
2. The in-vehicle camera video output circuit of claim 1, further comprising a fourth resistor R4 and a fifth resistor R5, wherein one end of the fourth resistor R4 is grounded and the other end is connected to a line between the first diode D1 and a corresponding input of the filter module; one end of the fifth resistor R5 is grounded and the other end is connected to a line between the second diode D2 and the corresponding input of the filter module.
3. The in-vehicle camera video output circuit of claim 1, further comprising a first diac D3 connected at one end to ground and at the other end to a line between the first resistor R1 and the first differential video signal output terminal, and a second diac D4 connected at one end to ground and at the other end to a line between the second resistor R2 and the second differential video signal output terminal.
4. The video output circuit of claim 1,2 or 3, wherein the filter module is a two-stage Pi-type filter, and includes a first inductor L1, a second inductor L2, a third inductor L3, a fourth inductor L4, a first capacitor C1, a second capacitor C2, and a third capacitor C3, where the first inductor L1 and the third inductor L3 are connected in series and between a cathode of the first diode D1 and the first resistor R1, the second inductor L2 and the fourth inductor L4 are connected in series and between a cathode of the second diode D2 and the second resistor R2, two ends of the first capacitor C1 are connected to a line between the first inductor L1 and the third inductor L3 and a line between the second inductor L2 and the fourth inductor L4, and two ends of the second capacitor C2 are connected to a line between the third inductor L3 and the first inductor L1 and a line between the second inductor R4 and the fourth resistor R2, respectively.
5. The video output circuit of claim 1, further comprising a first test point TP1, a second test point TP2, a third test point TP3, and a fourth test point TP4, wherein the first test point TP1 is connected to the anode of the first diode D1, the second test point TP2 is connected to the anode of the second diode D2, the third test point TP3 is connected to a line between the filter module and the first resistor R1, and the third test point TP3 is connected to a line between the filter module and the second resistor R2.
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| CN201810247037.2A CN108259704B (en) | 2018-03-23 | 2018-03-23 | Video output circuit of vehicle-mounted camera |
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| CN201810247037.2A CN108259704B (en) | 2018-03-23 | 2018-03-23 | Video output circuit of vehicle-mounted camera |
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| CN108259704B true CN108259704B (en) | 2024-04-30 |
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| 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 |
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