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信号放大和滤波的顺序



是否信号都需要先滤波再放大呢?如果我的信号噪声放大后不至于使运放失真的话是不是也可以先放大再滤波,这样还能把前级运放产生的噪声一块虑掉?还有如果我使用带增益的有源滤波的话效果和前两种方法又有何区别呢?