Help me！ How to prove the loop gain of a current mirror.
时间：10-02
整理：3721RD
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Please refer to the following Figure.
How to prove the loop gain of a modified Wilson MOS mirror is gmRin.Thanks you in advance.
vg4=Iin*Rin,假设M4,M2组成的源级跟随器增益为1，此时vg2=vg4.I'=gm1*vg4. T=I'/Iin。
2楼正解，反馈环应该是M2和M1吧，请高人纠正~