Digital amplifier of 96 kHz PWM frequency with 91dB dynamic range and 0.13% THD+N at full modulation

A Pulse Width Modulation digital amplifier is implemented at 96 kHz of switching frequency, significantly lower than the conventional 384 kHz. This provides numerous advantages: less computational time; lower thermal burden on the output stage power MOSFETs; higher Modulation Index; and lower produc...

Ausführliche Beschreibung

Gespeichert in:

Bibliographische Detailangaben
Veröffentlicht in:	IEEE transactions on consumer electronics 2012-11, Vol.58 (4), p.1307-1313
Hauptverfasser:	Kyoungsoo, Park, Hah, Zaegyoo, Sung, Koeng-Mo
Format:	Artikel
Sprache:	eng
Schlagworte:	Amplifiers Digital digital amplifier Dynamic range Electronics Microwave integrated circuits Modulation Modulation Index MOSFETs Noise Noise-Shaper Power amplifiers Power generation Pulse duration modulation Pulse width modulation PWM frequency Switching
Online-Zugang:	Volltext bestellen
Tags:	Tag hinzufügen Keine Tags, Fügen Sie den ersten Tag hinzu!

Beschreibung
Zusammenfassung:	A Pulse Width Modulation digital amplifier is implemented at 96 kHz of switching frequency, significantly lower than the conventional 384 kHz. This provides numerous advantages: less computational time; lower thermal burden on the output stage power MOSFETs; higher Modulation Index; and lower production cost. The implemented system provides 91dB of Dynamic Range with optimized Noise-Shaper coefficients and satisfies the need of most consumer audio products. The Total Harmonic Distortion + Noise ratio, with the optimized clipping compensation of the NS overflow, is 0.13% at full modulation. The reduced THD+N and switching loss increase the maximum output power at fixed levels of power supply voltage and speaker impedance.
ISSN:	0098-3063 1558-4127
DOI:	10.1109/TCE.2012.6415000