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Determine the driving point impedance Z11(S) in the circuit shown below.(a) (8 S+4)/(4 S+4)(b) (8 S+4)/(4 S+3)(c) (8 S+4)/(4 S+2)(d) (8 S+4)/(4 S+1)I got this question in semester exam.This interesting question is from Network Function for the One-Port and Two-Port topic in division S-Domain Analysis of Network Theory

Answer» CORRECT option is (d) (8 S+4)/(4 S+1)

To elaborate: The driving point impedance Z11(S) is Z11(S) = V1(s)/I1(s). V1(s) = I1(s)((2/(4s+1))+2) = I1(s)((8s+4)/(4s+1)) => V1(s)/I1(s) = ((8s+4)/(4s+1)). On substituting we get Z11(S) = (8S+4)/(4S+1).


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