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OPA2344电压跟随问题

Other Parts Discussed in Thread: OPA2344

前辈们好,小弟在做opa2344电压跟随实物测量时有几个问题不懂,还请前辈们指导指导。

问题1:4点的电压总比3点高200~300mv(我测试的电压范围1.5-2v)

问题2:电压跟随的时候为什么当输入电压从高降低变化时可能导致4点(8点)的电压接近0v。(也就是我测试电压从2v变化到1.5v时可能会在1.5v时输出接近0v)