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An amplifier has a bandwidth of 20 kHz and a mid band gain of 50 without feedback. If a negative feedback of 1% is applied, then bandwidth with feedback is:
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- 13.3 kHz
- 30 kHz
- 10 kHz
- 40 kHz
Correct Option: B
Given, BW = 20 kHz
A = 50
B = 1% = 0.01
BW* = BW (1 + Aβ)
(∴ after feedback bandwidth increases)
or BW* = 20 kHz (1 + 50 × 0.01)
BW* = 30 kHz
