Response to the following problem:
The two-stage op amp in Figure is fabricated in a 65-nm technology having k1n = 5.4 × k1p = 540 μA/V2 and Vtn = -Vtp = 0.35 V. The amplifier is operated with VDD =+1.2 V and VSS =0 V.
a) With A and B at a dc voltage of VDD/2, perform a dc design that will result in each of Q1:Q2:Q3:and Q4: conducting a drain current of 200 μA and ach of Q6:and Q7:conducting a current of 400 μA. Design so that all transistors operate at 0.15-V overdrive voltages. Specify the W/L ratio required for each MOSFET. Present all results in a table.
(b) Find the input common-mode range.
(c) Find the allowable range of the output voltage.
(d) With vA = vid/2 and vB =-vid/2, find the voltage gain vo/vid . Assume an Early voltage of 1.8 V.
