要做一个二阶的有源的低通滤波器,截止频率设置为20K,需要一个低功耗的运放,供电电流最好在0.5mA以下,要求轨道轨输入输出,我的信号的事单极性的,峰峰值在4.2V左右, 在WEBENCH上设计了,但是选择的运放都不理想,请问有没有推荐的。
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