在自动控制和自动测试系统中,需要对取样电压进行加、减、取绝对值、取平均值等各种运算,也需要将运算结果与参考电压比较再进行模数(A/D)转换。在一些精度要求不高的应用场合采用运算放大器多功能应用电路来完成上述任务,可以减化实际线路,降低成本,降低整机功耗,也相应减少了干扰, In the automatic control and automatic test system, you need to add, subtract, take the absolute value of the sampled voltage, averaging and other calculations, but also need to compare the results with the reference voltage and then the analog to digital (A / D) conversion. In some applications where the precision is not high, an operational amplifier multi-function application circuit is used to accomplish the above tasks, which can reduce the actual circuit, reduce the cost, reduce the power consumption of the whole machine and correspondingly reduce the interference,