Q. A current controlled current source (CCCS) has an input impedance of 10 Ω and output impedance of 100 kΩ. When this CCCS is used in a negative feedback closed loop with a loop gain of 9, the closed loop output impedance is
(A) 10 Ω
(B) 100 Ω
(C) 100 kΩ
(D) 1000 kΩ
Ans: 1000 kΩ
Solution:
Input impedance = 10 Ω
Output impedance = 100 kΩ
loop again (Aβ) = 9
Closed loop impedance will be:
Zout = Zo [1 + Aβ]
= 100 × 103 [1 + 9]
= 1000 kΩ
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