(a) Retracing similar steps to those leading to Eq. (4.125), prove Eq. (4.161). Hint: consider one mismatch at a time, and then add them up in rms fashion. (b) Estimate the likely value of VOS if ISS...

(a) Retracing similar steps to those leading to Eq. (4.125), prove Eq. (4.161). Hint: consider one mismatch at a time, and then add them up in rms fashion. (b) Estimate the likely value of VOS if ISS 5 0.25 mA, kn 5 (4 6 10%) mA/V2 , kp 5 (2 6 10%) mA/V2 , and both Vt n and Vt p have 610-mV tolerances. Which is the major contributor to VOS?