GATE Electrical Engineering (EE) 2019 Solved Paper

Question : 30 of 65

Marks: +1, -0

A current controlled current source (CCCS) has an input impedance of

10 Ω

and output impedance of 100

{k} Ω

. When this CCCS is used in a negative feedback closed loop with a loop gain of 9 , the closed loop output impedance is

Solution:

CCCS is current-shunt-negative feedback amplifier.
The output impedance

{R}_{\;\text "of "\;}= {R}_{0}(1+β {A})

, Given

{A} β=9

=100 × 10^{3}(1+9)

=1000 {kW}

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