一种用于ESD保护的SCR触发电路

A SCR Trigger Circuit for ESD Protection

介绍一种检测ESD电压并输出触发或关断信号的电路结构。通过对ESD脉冲的上升沿进行分辨,然后输出触发信号从而触发SCR钳位器件对内部电路进行保护,并在ESD脉冲结束时对脉冲下降沿进行检测,从而输出关断信号关断SCR钳位器件,防止闩锁效应的发生。仿真结果显示,该电路能较好地检测ESD脉冲的上升沿或下降沿而输出不同的信号,从而能降低SCR钳位器件的触发电压,并防止闩锁效应。

The paper describes a new SCR triggering circuit for ESD protection. It can detect the ESD voltage and output a triggering signal and open the SCR device to protect the inner circuit. After the ESD case, the circuit can detect the fall edge of ESD voltage to output a signal. Then the SCR device will be turned off to prevent latch-up effect. The simulation results show the novel triggering circuit can detect the ESD pulse and output different signals, so it is good for reducing the triggering voltage SCR and preventing latch-up effect.