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跨导放大器电阻取值

像上图中的跨导放大器,对于电阻R1的取值有没有要求?

1.比如我现在取值是10M,那么我取值更大的值10M,20M,对整个电路有什么影响? 取大了影响是什么?

2.R1的取值取小有什么影响?在信号幅值满足要求的条件下,是不是越小越好?