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多级共模电压匹配技术

一般情况下,若上级的共模电压与下级的共模电压不一致时,采用电容隔离共模电压之间的相互影响,最近看到一篇文章,采用了共模重置电路进行电压的匹配,电路如下:

请问这种共模重置电路有什么优势?以及以往的设计思想有没有考虑过这种电路?