9.2 For the PMOS differential amplifier shown in Fig. P9.2 let Vtp = −0.8 V and kpW/L = 4 mA/V2. Neglect channel-length modulation.(a) For vG1 = vG2 =0 V, find |VOV | and VSG for each of Q1 and Q2. Also find VS, VD1, and VD2. (b) If the current source requires a minimum voltage of 0.4 V, find the input common-mode range.