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放大电路的阻抗匹配

Other Parts Discussed in Thread: OPA657

如题,自己设计了一个放大电路,但对输出端那是否达阻抗匹配不怎么了解。。。 

下图就是自己设计的放大电路,用了两个ADA4817和一个OPA657。  所用的探头是10M欧姆的阻抗,电容小于12pf,不知道输出端这样设置可否达到匹配。。