4--In the given circuit, n MOSFETs are used. Q1, Q2,….. Parameters of Qn MOS transistors Vt=1V, γ=0, λ=0, μn Cox=200μA/V2 and (W/L)1=(W/L)2=….=(W/L)n=20 a) VGS=?, ID=?, gm=? b) Find the input and output impedance. c) Find the voltage gain.

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