Periodically Switched Circuits

This chapter is devoted to illustrating applications of the theory of weakly nonlinear time-varying systems with practical examples. After introducing the class of electrical networks called switched circuits, we analyse in details some instantiations. We analyse a practical implementation of a quadrature modulator, including its distortion and other aspects of fundamental importance in applications. As another example of the usefulness of time-varying circuits, we illustrate how they allow implementing highly selective filters that are otherwise unfeasible in small integrated form.