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用软件仿真根本无法实现仿真，想实现输出电压等于Vref但是没法实现，想设计一个用VCA821设计一个AGC电路实现输出直流电压等于Vref的直流电压，可是仿真无法实现，求助。Tina仿真电路图如附件
设计AGC目标是实现VCA821输入的信号直流电压等于从OPA820输入参考信号直流电压
