How does negative feedback increase the bandwidth of an amplifier?
A) the roll-off in open-loop voltage gain means less voltage is fed back, which produces more input voltage as compensation
B) the roll-off in open-loop voltage gain means more voltage is fed back, which produces more input voltage as compensation
C) the roll-off in closed-loop voltage gain means less voltage is fed back, which produces less input voltage as compensation
D) the roll-off in closed-loop voltage gain means more voltage is fed back, which produces less input voltage as compensation

Question

Quizplus · Accepted Answer

Negative feedback reduces the open-loop voltage gain, which means that less voltage is fed back to the input. This reduction in feedback voltage increases the input voltage required to produce the same output voltage, meaning the amplifier can respond to higher frequencies, and therefore has a greater bandwidth.

How Does Negative Feedback Increase the Bandwidth of an Amplifier