Question

What is the impedance from the output port according to Millers compensation and pole splitting?

(a) Zin2 = Z × K / K – 1

(b) Zin2 = Z × K / K + 1

(c) Zin2 = Z / K – 1

(d) Zin2 = Z / K + 1

This question was posed to me during a job interview.

My doubt is from Miller Compensation and Pole Splitting topic in division Frequency Response of Electronic Devices & Circuits

Answer 1

Right answer is (a) Zin2 = Z × K / K – 1

For explanation I would say: According to Millers compensation and pole splitting, to calculate the input impedance from the output port we use: Zin2 = Z × K / K – 1. Where, Z is the original circuit impedance and K is the ratio of the two nodal voltages V2 / V1.