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运放开环输出阻抗和闭环输出阻抗的计算问题。



阅读运算放大器稳定性分析(TI合集)这篇文章时,在计算输出闭环阻抗上面有个疑惑:

推到Rout的过程中,为什么不考虑反馈回路的电流,如下图:

此处为何会忽略反馈网络上对外加激励的分流值呢?

谢谢!