Repeat Problem 12.5 c when the gates of M₃and M₄are the CMC input, and the gate of M₅ connects to a bias voltage.

Data from Prob. 12.5 (c)

For the op amp in Fig. 12.2, use the data from Problem 12.4 except use I_D5 = 100 µA and |V_ov| = 0.1 V for all transistors. Assume all transistors operate in the active region with C_gs = 180 fF And C_gd = 20 fF.

(c) Calculate the common-mode control gain a_cmc.

Fig. 12.2:

VDD VBIAS M4 o Vo2 Vo1* M2 Vi2 M1 M5 -Vss