近期用opa657芯片做跨阻放大器,电路图是按芯片手册(即第一张图搭的),用的光电二极管是BPW34,但是用示波器测输出的是直流信号。而论坛上有人输出的是交流信号,不懂是电路问题(原理图为图二),还是我理解上的问题,求指教
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