Bi-quad calibration

摘要: Embodiments include methods of tuning state variable filters. Examples filters whose center frequencies can be tuned using gain blocks coupled to outputs filter integrators. First- and second-order may operate on signals in parallel their combined produce a filtered output. Filters pass or reject depending the application; sample applications include, but are not limited to: agile filtering; spectrum analysis; interference detection rejection; equalization; direct intermediate-frequency transmission; single-sideband modulation demodulation.