Design of nonlinear analog switched-capacitor circuits using building blocks

This paper describes an approach to the design of nonlinear analog switched-capacitor (SC) circuits using building blocks. First, we derive a number of nonlinear SC circuits, such as comparators, Schmitttriggers, waveform generators, etc., using stray-insensitive integrators and amplifiers. Then, as an example, an interpolative converter and an FSK modulator design will be discussed and their integration in silicon-gate CMOS technology will be presented. Finally, a design example of an FSK demodulator with an SC phase-locked loop will be demonstrated.