Computer-aided distortion analysis of switched capacitor filters in the frequency domain

A Volterra series-based distortion analysis technique for switched capacitor circuits is presented. The algorithm has been implemented in the DIANA-SC program and is completely compatible with other DIANA simulation modes. The efficiency of the method is based on the use of direct z-domain and compaction methods, while only one extra circuit analysis is needed for each higher order distortion fraction of interest. Nonlinear operational amplifiers and capacitors can be handled using polynomial models. Both harmonic and intermodulation distortion analysis modes are available. The method is demonstrated using a practical design example.