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The integrated operational amplifier is very sensitive to external electrical stress. In the process of using the operational amplifier, if there is excessive voltage or current due to operational errors or abnormal working conditions, especially surges and static pulses, it is very It is easy to damage or change the op amp. Overvoltage damage protection method taken at the input of the op amp differential mode. In the integration circuit, if the capacitor is charged and discharged to a high potential, and then the power supply voltage is cut off, a transient voltage is generated at the input terminal, and a large discharge current is generated, resulting in damage to the operational amplifier. If the capacitance is large (eg greater than 0.1μF), this effect will be significant. With a simple protection circuit, the differential mode voltage can be effectively prevented from being excessively large, resulting in failure of the circuit inside the operational amplifier.