Design a three-stage operational amplifier at the transistor
level using BJT technology. Your design should
include a differential input stage with large input resistance,
a gain stage, and an output stage with low
input resistance. Justify your design choices. Use the op-amp
you designed to create an inverting amplifier
using negative feedback with a given gain, A = −Rf/Ri . Provide
a characterization of your op-amp design which
includes input resistance, output resistance, input bias
currents, input offset current, input...