![A current controlled current source (CCCS) has an input impedance of 10 Ω and output impedance of 100 kΩ. When](https://www.gkseries.com/blog/wp-content/uploads/2023/08/A-current-controlled-current-source-CCCS-has-an-input-impedance-of-10-Ω-and-output-impedance-of-100-kΩ.-When.jpg)
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