Strays-insensitive switched capacitor biquads with reduced number of capacitors

A new general structure for strays-insensitive switched capacitor biquadratic cells based on an altered set of input/output conditions is proposed. Several transformations which reduce the size or number of capacitors or create a filter characteristic independent of capacitor ratios are presented. Finally, a family of biquads which realise all inverting and noninverting bilinear transformed functions for leapfrog and follow-the-leader feedback filters are derived from the general structure.