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电流源电路仿真问题

Other Parts Discussed in Thread: OPA2333

如图,我在仿真OPA2333提供的电流源电路时,输入电压改变,但在图中20欧电阻的电压始终不变为1.86V,理论上应为1V,但怎么都不对,我图上的MOS管,开启电压分别是1.2V和-550mv,求帮助找出仿真结果错误的原因~~