Discussion
Why does negative feedback extend an amplifier's bandwidth?
Answer: C
Feedback reduces the closed-loop gain, and since the gain-bandwidth product is roughly fixed, the bandwidth rises in the same proportion the gain falls. It cannot change the device capacitances or remove the Miller effect, though it does reduce the effective source impedance seen by the input. It also extends the low end, but through a different mechanism. Trading a surplus of gain for something scarcer is what feedback does in every respect, and bandwidth is the clearest case.
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