Title :
Effect of dead time on harmonic distortion in class-D audio power amplifiers
Author :
Mosely, I.D. ; Mellor, P.H. ; Bingham, C.M.
Author_Institution :
Dept. of Electr. & Electron. Eng., Machines & Drives Group, Sheffield, UK
fDate :
6/10/1999 12:00:00 AM
Abstract :
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
Keywords :
audio-frequency amplifiers; harmonic distortion; power amplifiers; pulse width modulation; PWM-driven audio power output stages; class-D audio power amplifiers; dead time; harmonic distortion; load impedance; modulation depth; power stage nonlinearity; switching frequency;
Journal_Title :
Electronics Letters
DOI :
10.1049/el:19990705
