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我不明白的是文档中说这种拓扑电路不被采用的原因是第一级的运放增益小于1，运放可能不稳定。是不是作者笔误还是我英语原文理解不对。原文如下:However, this topology is not recommended because the first op amp is operated at less than unity gain, so it may be unstable.
