Question: Consider a two-stage CMOS op amp modeled by the equivalent circuit in Fig. 9.18, where is = g m v id and v id is

Consider a two-stage CMOS op amp modeled by the equivalent circuit in Fig. 9.18, where is = g_mv_idand v_idis the differential op-amp input. Let g_m= 19.7mA/V, R₁= R₂= 6.67 kÎ©, and C₁= C₂= C = 2 pF. Calculate and sketch the root locus when feedback is applied as f varies from 0 to 1. Calculate the real component of s for which the poles become complex. Is the amplifier unconditionally stable? If yes, calculate the pole positions for unity-gain feedback. If no, find the loop gain required to cause instability.

Figure 9·18:

8mV1 C, = R, R2 C2

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