A stray-insensitive single switched-capacitor ladder realization of an arbitrary order low-pass filter

A stray-insensitive biphase SC realization of an all-pole filter of any desired order is first obtained in the ladder form with all the SCs of equal value. These equal-valued SCs are then replaced by a single time-shared SC. Like any other time-multiplexed circuit, this circuit also requires an increased number of clock phases. Thus against an increase in the die area to generate a multiphase clock on the chip, there is a saving due to the reduction in the total capacitance. One such fifth-order low-pass filter is designed and tested with discrete components to verify its performance.