The computer program Bandpass Filter Design (Appendix A. 13) uses
Equations (5.58), (5.59), and (5.60) for the design of a simple band pass filter.
Either Q or 3 dB bandwidth may be specified.
5.4
State
Variable
Filters
Originally, the principal application of operational amplifiers was in analog
computers. Configurations of operational integrators and summers enabled
rapid continuous solutions to be obtained for a wide range of differential equa-
tions;
the classical text was Korn and Korn (1964). The use of analog comput-
ers has now been almost entirely superseded by the use of digita
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