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电压跟随器运放选型

Other Parts Discussed in Thread: LMV321

用555产生了一个频率为20kHz,电压峰峰值为5V的方波,现将其峰峰值由电阻分压降至1v,再加一级跟随器,请问运放选型能否给予推荐,最好能再讲讲理由,感激不尽。