# Oscillators – 68

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68. Determine the input impedance with feedback for a voltage-series feedback having A = –100, R1 = 15 kΩ, Ro = 20 kΩ, and a feedback of β = –0.25.

(a) 110 kΩ
(b) 290 kΩ
(c) 390 kΩ
(d) 510 kΩ

Explanation
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