Synthesis of switched-capacitor parametric bandpass filters

A new approach to the synthesis of element simulation type bandpass switched-capacitor (SC) filters associated with parasitic capacitances is presented. The synthesis of a parametric bandpass LCR prototype is considered as a starting point of the method. The proposed approach allows one to design two-phase controlled SC filters with a low number of operational amplifiers. A predistortion technique is used for elimination of the influence of the parasitics on the circuit characteristics. A theoretical discussion as well as the results of computer simulation on a twelfth-order parametric bandpass SC filter is included.