关键词: 测试系统, 运放环模块, 参数测试

Abstract: Operational amplifier is the most important unit circuit in the analog circuit. With the development of miniaturization of integrated circuits, the testing of operational amplifiers is becoming more and more complex. The operational amplifier loop of ATE provides high precision test resources, while making all the resources available individually at the interface of device under test, and make the design of the test circuit simpler. According to the physical significance of operational amplifier parameters and its testing principle and method, the corresponding test circuit is built for different parameters by programming the switches and relays of the module, and the parameters of the operational amplifier can be tested accurately and automatically. The actual test results show that this method can ensure the accuracy of the test results when testing the input offset voltage, output swing, open loop voltage gain, power supply voltage rejection ratio and common mode rejection ratio of the operational amplifier.

Key words: testsystem, operationalamplifierloopmodule, parametertest