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电路如图，供电-2.5v~8V，OPA695与NMOS组成一个电流源，但是运放同相输入端悬空时（接地也是相同的情况），也会有4V~7V（一般是4V）的电出现，mos管中通过的电流大约为80mA，正常情况下运放不是应该没有输出电压才对的吗？
