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在计算运放电路中电阻噪声密度时，等效电阻值为什么是RI和Rf的并联值？同样噪声增益的情况下，同相放大和方向放大的电阻噪声密度有啥区别？电路图如下所示：
热噪音有几种。一种是热漂移噪音，通常用降温法很容易发现。
