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Effect of dead time on harmonic distortion in class-D audio power amplifiers

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3 Author(s)
Mosely, I.D. ; Dept. of Electr. & Electron. Eng., Machines & Drives Group, Sheffield, UK ; Mellor, P.H. ; Bingham, C.M.

A model is described for predicting the harmonic levels introduced by the use of dead time in class-D, PWM-driven audio power output stages. The model demonstrates that the harmonic levels are a function of load impedance, modulation depth, dead time and switching frequency. In addition, measurements show that, for audio applications, dead time is the dominant cause of power stage nonlinearity

Published in:

Electronics Letters  (Volume:35 ,  Issue: 12 )