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我用TI官网的Filter Design 工具设计了一个八阶的低通滤波器，原理图如下，然后转换成差分滤波器，并把OPA187换成OPA211，结果并不理想，如下波形，请帮忙看下问题出在哪？
您好，
您输入信号的幅值范围是多少？增益、截止频率是多少？转换成差分滤波器前，单端滤波效果是怎样的？
