We have just seen that the negative feedback can compensate for a drop in caused by, for example. We can then expect that it can also compensate for a drop in caused by a limited frequency response. Improved frequency response of an amplifier with negative feedback' The Figure 6.9 shows such an improved frequency response.
Feedback amplifiers have also other benefits, such as reduced distortions of signals.
We learned that an important feature of amplifiers is their input and output resistance and . In ideal amplifiers the input resistance is infinite and the output resistance is zero. In real amplifiers, however, both are finite, although the input resistance may be high and the output resistance low. These resistances are further improved if the amplifier is placed in a feedback loop. It can be shown that the input resistance is increased by a factor of and the output resistance is reduced by the same factor.