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对于运放输出端加电阻负载的疑问?

对于运放输出端加电阻负载有疑问,什么情况下改加,什么情况下不该加呢?若如图2,跨阻放大后接ADC,或者同相放大电路后接ADC,这都需要加一个负载电阻吗?还是......?