An improved tuning technique for switched capacitor filters

A new technique is described for tuning SC circuits that provides wide-ranging, continuous tuning of any circuit parameter that is determined by a capacitor ratio. The technique employs voltage scaling circuits to modify effective capacitor ratios. Although based on the master-slave control principle, these strategies are considerably more economical than other widely used master-slave tuning methods as they do not require duplication of a substantial part of the main filter