SAMPLED-DATA SIMULATION OF PERIODICALLY SWITCHED LINEAR CIRCUITS - Computer Methods for Analysis of Mixed-Mode Switching Circuits - page 113

and is the unit step function. Note that should be chosen in
such a way that Nyquist theorem is not violated in representation of
using

The time origin is reset to and the circuit in

the time interval is depicted by

Following the same procedures as those for circuits with an exponen-
tial input, one can show that the response of the circuit is given by
[49]

where

and

For fixed step size T , both and are constant and need
to be computed only once. In Appendix 6.A of this chapter, the
algorithms for computing

and are given. Also note

that T should be chosen no larger than