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opa330用作电压跟随器输出误差比较大,大约50mv,这不应该啊

Other Parts Discussed in Thread: OPA330

ref选择的是5v基准电压芯片,然后电压跟随器为仪表放大器提供一个参考电压,但是输出端跟运放正相端的电压竟相差50mv。这是为何?