The process of negative feedback in electronics can involve returning a fraction of the output of an operational amplifier to the input. This may affect the gain and the bandwidth (the range of frequency over which the gain is constant). Which one of the following combinations of effects is correct?

Question

The process of negative feedback in electronics can involve returning a fraction of the output of an operational amplifier to the input. This may affect the gain and the bandwidth (the range of frequency over which the gain is constant). Which one of the following combinations of effects is correct? (A) Effect on gain - Increased , Effect on bandwidth - Decreased (B) Effect on gain - Decreased , Effect on bandwidth -Decreased (C) Effect on gain -Increased , Effect on bandwidth -Unchanged (D) Effect on gain -Decreased , Effect on bandwidth -Increased

Tardigrade Admin · Accepted Answer

The purpose of negative feedback resistor in an operating amplifier (OP-AMP) is to increase the frequency bandwidth of the OP-AMP but at the expense of its gain, i.e., at a lower constant gain.