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1、在有的帖子，或资料上看到，运放的输入，输出进行阻抗匹配后会损失6dB的增益，这是为什么呢？
2、如图：
为阻抗匹配；信号输出会串联一匹配电阻；输入会并联匹配电阻。在同一阻抗输入、输出下；输入和输出都是两等值电阻串联分压。即信号减半。共计跌落6dB。
