Feedback Control

A feedback controlled system is a system that compares its own output to a desired value and automatically takes corrective action. This paper will examine linear feedback systems, including the basics of automobile cruise control, operational amplifiers, and PID controllers. System performance can be improved by the use of feedback, especially when faced with external disturbances. To realize these gains, however, the feedback system must be properly designed. Design tools such as Nyquist stability criteria, Bode plots, and pole-zero placement will be examined.