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在利用OPA657进行仿真时，进行交流分析发现系统提示只能有一个输入源，不知道什么原因，希望各位大神指点。我利用两个电流源来仿真光电探测器
平衡探测器由两个光电探测器组成，因为没找到平衡探测器元件，就用两个电流源替代。原理图如下
