The simple model for the common-gate M₁₁in Fig. 9.22 b has zero input impedance. Show that if the common-gate stage M₁₁is modeled with nonzero input impedance, the compensation scheme in Fig. 9.22 a introduces a zero at ˆ’g_m11/C in the amplifier gain. To simplify this analysis, assume that r_o11= ˆž, γ = 0, and ignore all device capacitances.

Figure 9.22 a & b:

Vpp 13 VB M11 in+ in- V1 12 -Vss (a) 1. ic (b)