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用OPA657设计的跨阻放大电路

Other Parts Discussed in Thread: OPA657

尊敬的TI专家你好,我按手册利用OPA657设计了电路如下:

但是实际中发现VO端的电压是固定的0.83V,不论光电二极管的输入光强多大VO电压都不变,反馈电阻两端的电压在改变?这是什么原因?