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It is shown that the state-space averaging method can be extended by linear network theory from the domain of pulse-width-modulated converters to a much larger class of converters, including resonant switch converters, current programmed mode, and others. The canonical model concept is also extended, and it is shown that the effect of resonant switching is to introduce a feedback block into the generalized canonical model. These results are applied to linear zero-current and zero-voltage resonant switches, a novel class of nonlinear resonant switch converters, and the current programmed mode. Equivalent circuit models are developed for both full and half-wave operation, and experimental verification is presented.< >