Pre‐filter design for tracking error specifications in QFT

This note shows how the pre-filter may be designed in quantitative feedback design of single-input, single-output systems with tracking error specifications (Eitelberg, Automatica, 2000; 36(2):319). The method uses gain and phase information for the pre-filter design. The design is conveniently performed on the log polar complex plane using standard CAD tools. Copyright © 2003 John Wiley & Sons, Ltd.