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VM1那里怎么看都不是一条直线呀,怎么会振荡起来了呢?是电路有问题么?
亲;C1为啥直接接在运放口?这货直接导致运放内反馈移相180度;自激了。
要滤波!就要规规矩矩的用!这种碰到了非常少见的运放动态内阻概念等问题,就会速手无策。
C1容性负载太大了,使得运放增加了一个额外的极点,造成运放不稳定。INA333最大容性负载不能超过500pF。