Background on Switched-Capacitor Filters

Interest in switched-capacitor (SC) networks began in the late 1970s due to the possibility of implementing precision analog filters using integrated circuit (IC) technology, since it is possible to achieve good accuracy in the ratio between two capacitors values. Typically, high-valued resistors are used in the implementation of analog filters that can be replaced by small on-chip capacitors, making it an attractive option for monolithic fabrication, since it occupies a small substrate area.