Electronic Devices - Oscillator Circuits - Discussion
Discussion Forum : Oscillator Circuits - General Questions (Q.No. 57)
57.
Determine the input impedance with feedback for a voltage-series feedback having A = –100, R1 = 15 k
, Ro = 20 k, and a feedback of 
= –0.25.
, Ro = 20 k, and a feedback of = –0.25.110 k
290 k
390 k
510 k
Discussion:
2 comments Page 1 of 1.
Randy said:
10 years ago
Zi = Ri(1+BA).
(1)
Vins said:
3 years ago
Why Ri is R1? Explain with the formula.
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