Switched-capacitor bandpass filter based on simulation of canonical reactance sections

A design method is described for switched-capacitor filters. It is based on the simulation of doubly terminated reactance filters in a canonical tandem section configuration and using the bilinear s-to-z transformation between the frequency planes of the continuous-time reference filter and the discrete-time switched-capacitor filter. The switched-capacitor circuits are completely insensitive to parasitic capacitances. The method permits the switched-capacitor realization of the whole class of lossless two-ports.