Implementing a PSoC Eight Pole 50x Oversampled Switched Capacitor Low-Pass Bessel Filter

Integrated switched capacitor filters have been commercially available for several decades. However they have limited configuration parameters and no other system functions. This paper explains the bi-quad architecture used to implement low pass filters. Equations are developed to implement low pass filters. A PSoC implementation of an 8 pole reconfigurable low pass Bessel filter is developed with 17% of the analog blocks, 100% to the digital block, and 100% of the CPU remaining for a complete system design.