Question

A driving point impedance with zero at ω = 0 and pole at ω = ∞ must have ___________ term in the numerator polynomial.

(a) s+1

(b) s

(c) s+3

(d) s+2

I have been asked this question at a job interview.

I want to ask this question from Frequency Response of Reactive One-Ports in section Elements of Realizability and Synthesis of One-Port Networks of Network Theory

Answer 1

The correct answer is (b) s

Explanation: As ω = 0, (s-jω)=s. The numerator of Z(s) contains poles and denominator contains zeros. So there will be s term in the numerator polynomial.