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OPA656做跟随器,输出振荡问题

Other Parts Discussed in Thread: OPA656

OPA656是一款单位增益稳定的运放,且带宽也有500M

今天我用它仿真了一个跟随器,输入20M,Vpp200mV, 无直流偏置正弦波,输出正常;

当我改变输入为400mV时,输出振荡。

由于我只改变了幅度,后来计算了下OPA656的压摆率也是够的,不知道为什么振荡了,希望工作人员能予以帮助。

谢谢,仿真截图在附件中。

 

opa656.doc