Discussion
Gain bandwidth product of an amplifier after inclusion of negative feedback :
Answer: C
The gain-bandwidth product remains constant.
For an amplifier with a single dominant pole, negative feedback reduces the gain by the factor (1 + Aβ) and increases the bandwidth by the same factor. The product of the two is therefore unchanged: an op-amp with a gain-bandwidth product of 1 MHz gives a bandwidth of 100 kHz at a gain of 10 and 10 kHz at a gain of 100.
So the product neither decreases nor increases, and it certainly does not become zero; feedback only trades gain for bandwidth.
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