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Analogue video signal processing circuit testing method

A signal processing circuit, analog video technology, applied in the direction of television, electrical components, image communication, etc., can solve the problems of high price, high labor cost, poor accuracy, etc., to achieve less impact on interference, improve test accuracy, and improve work The effect of efficiency

Inactive Publication Date: 2007-08-22
WUXI CRYSTAL SOURCE MICROELECTRONICS CO LTD
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AI Technical Summary

Problems solved by technology

Special test equipment can achieve high test accuracy, but its versatility is poor, and it is difficult to realize fully automated testing
Expensive if purchased as a kit of automated testers
However, the simulated installation test has poor accuracy and cannot realize fully automated testing. The labor cost is expensive, and the test quality cannot be guaranteed due to human factors.

Method used

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  • Analogue video signal processing circuit testing method
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Embodiment Construction

[0034] Since the measured signal is an analog video signal with a DC component, non-contact optocoupler and other isolation schemes cannot be used. This scheme adopts a direct operational amplifier follow-up test. In order to minimize the interference of the test process on the signal itself, the operational amplifier is required to have a high input impedance. At the same time, the choice of op amp should also pay attention to several aspects:

[0035] 1. Frequency response characteristics. The frequency response of the op amp should be determined according to the frequency band requirements and sampling rate of the signal to be measured.

[0036] The frequency band of the general video signal is about 6M. But in the actual test, nine-level gray-scale signals are used, so the sampling rate can be greatly reduced, so the requirements for the frequency band of the operational amplifier can be relatively reduced.

[0037] 2. Measure the signal size. According to the possible...

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Abstract

A text method simulating video signal processing circuit includes sending continuous simulation video signal of said circuit to data sampling module through isolation modulo, sending a group of collected discrete voltage signal to data measurement module by data sampling module, converting said discrete voltage signal to be a group of digital signal being sent to control module by data measurement module and storing said digital signal in control module, sending data to test computer after test of a group is finished and waiting for start-up of next test.

Description

technical field [0001] The invention relates to a testing method for testing an analog video signal processing integrated circuit, which belongs to the technical field of integrated circuit testing. Background technique [0002] At present, there are mainly special equipment testing and simulation installation testing for video signal testing methods. Special test equipment can achieve high test accuracy, but its versatility is poor, and it is difficult to realize fully automated testing. If you buy a complete set of automated testers, it is expensive. However, the simulation test has poor accuracy and cannot realize fully automated testing. The labor cost is expensive, and the test quality cannot be guaranteed due to the existence of human factors. Contents of the invention [0003] Technical problem: the purpose of this invention is to provide a kind of test method of analog video signal processing circuit, realize the automated test of analog video signal processing c...

Claims

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Application Information

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IPC IPC(8): H04N17/00
Inventor 朱伟民吴翔宇易法友
Owner WUXI CRYSTAL SOURCE MICROELECTRONICS CO LTD
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