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LM358: 用LM358P 和 IRF631搭建了一个恒流源,预计效果是输入1Vp 30KHz的正弦波,输出的是0.1mA幅度 30KHz的正弦波,但是仿真发现IRF631输出的电流波形失真了

Part Number: LM358

第一张图是恒流源的原理图,第二张图片是我用Multisim仿真的波形,仿真结果是:运放出来的波形失真严重,mos的源极电流也失真很严重,而且底部截止失真了,请问这是为什么?