Download Section I7: Summary

Section I7: Summary
In this section we’ve looked at how feedback is an important consideration
for an effective system designer. It can be used to improve the stability of
the system and to decrease the sensitivity of the system to changes in
device and/or operational parameters. Topics that should be somewhat
familiar after our discussions include
¾ the different types of feedback; i.e., positive and negative, as well as
current and voltage;
¾ application of feedback principles to single and multi-stage amplifiers;
¾ the use of feedback in operational amplifier circuits to reduce the effects
of frequency variations;
¾ the effect on stability of the poles and zeroes of a transfer function ; and
¾ how to determine stability from the amplitude and phase Bode plots.
Note that, although our discussion in this section has been restricted to BJT
and op-amp amplifiers, all feedback configurations, techniques and
considerations apply equally well to FET amplifiers…in the next section...