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关于单运放差分电路中添加反馈电容的问请教

各位专家,有几个关于运放电路中关于电容添加问题的请教(如下图示):

1、我看到很多如上图中的差分输入电路中都添加了C1和C2电容,添加这两个电容的作用是什么?

2、C1和C2添加的必要性,在什么情况下添加,什么情况下不加?

3、C1和C2的取值情况怎么确定?