我利用OPA627精密运放仿真Howland恒流源,输入信号为10kHz,1Vp-p,负载为0-10k可调电阻,当调节负载时,输出会有一定变化,但其值只有几百mV,最多为1V,并且输出会有直流成分(10V左右),其电路图如下
(图中未连接的线为示波器的线,AD8066改为OPA627),该图用multisim仿真,结果正确。请问大概是什么原因导致的??
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