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Based on FPGA and DSP chips, the detection circuit, which has four key technical indexes of analogue integrated operational amplifier, is designed. According to the fault dictionary method, the fault cause and fault position of the integrated operational amplifier can be judged, which proposes a new method for analogue circuit fault diagnosis. A design scheme of several key parts is given. They respectively are the design of the Excitation source circuit module, the design of the information acquisition and transmission module of FPGA, the circuit design of the key parameter test module, and the design of the DSP chip and the PC machine module. Through the overall system circuit test, it has achieved a good test result, and it has solved the problem of analogue integrated operational amplifier fault diagnosis, and also provides some technical support for analogue PCB board fault diagnosis.

KEY TECHNOLOGY DESIGN OF VIRTUAL INSTRUMENT FOR FAULT DETECTION ON ANALOGUE INTEGRATED OPERATIONAMPLIFIER BASED ON FPGA AND DSP