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This paper contains a detailed investigation of three sources contributing to pulse timing errors during switching within a half-bridge or full-bridge configuration, i.e. MOSFET turn-on and turn-off delays, dead time, as well as non-linear rise and fall switching transitions. The analysis is based on a novel simulation strategy that makes use of Newton's numerical method. The separate effect of each pulse timing error on harmonic distortion is established. A combination model is then introduced describing the interaction between the latter three timing errors.