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关于OPA690的求助

Other Parts Discussed in Thread: OPA690

各位专家,我用OPA690做了一个简单的电压跟随器,正输入端接输入信号,输出端和反相输入端相连,但是在没有输入的情况之下,输出竟然为3.8V,请问这是为什么,给怎么解决呢?