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关于运放带直流分量的问题



 

请教大家一些问题,我的三级放大器的第一级输出无直流分量,但是第二、三级输出出现直流分量,将第二级单独仿真发现是输入端的问题,请问怎么解决?另外图一中的R3 R4 R10是必需的吗?如果删去是否会对输出波形产生影响?