Delay characteristics of second-order bandpass filters
Claude S. Lindquist · Proceedings of the IEEE · 1970
The group delay characteristics of a class of second-order bandpass filters are derived. The results are directly applicable to any system involving this class of second-order functions. Recent all-pass networks are cited as examples. The results are generalized for other classes of functions, and can be used for all general delay analysis of systems having rational transfer functions.