FREQUENCY DOMAIN ANALYSIS OF PERIODICALLY SWITCHED NONLINEAR CIRCUITS - Computer Methods for Analysis of Mixed-Mode Switching Circuits - page 308

the nonlinear elements are mild. Multiplying (12.12) by the window
function

defined in (2.4), we obtain

where

and

Further multiplying (12.12) by the Dirac delta function
gives

where is the network variable at
is the term of the Volterra series expansion of
Fourier transform of (12.13) gives

Writing (12.17) for all clock phases and summing up the results give the
complete response of the periodically switched nonlinear circuit in the
frequency domain