Title :
Modulation and Control of a Three-Level Class-D Audio Power Amplifier
Author :
Yu, Shiang-Hwua ; Tseng, Ming-Hung
Author_Institution :
Department of Electrical Engineering, National Sun Yat-Sen University, 70 Lien-Hai Road, Kaohsiung, 804, Taiwan, shaun@mail.ee.nsysu.edu.tw
Abstract :
A three-level modulation and control scheme for a class-D audio power amplifier is presented. The proposed scheme mainly consists of a three-level modulation circuit and a feedback compensation circuit. The three-level switching scheme avoids unnecessary violent switching action when the input signal is small. The feedback compensation circuit significantly reduces in-band switching noise and improves the amplifier´s linearity. A design example is demonstrated, which yields the THD+N% of 0.48%.
Keywords :
class-D power amplifier; pulse-width modulation; relay feedback system; sigma-delta modulation; Circuit noise; Feedback circuits; Logic; Nonlinear filters; Output feedback; Power amplifiers; Pulse amplifiers; Pulse modulation; Pulse width modulation; Switching circuits; class-D power amplifier; pulse-width modulation; relay feedback system; sigma-delta modulation;
Conference_Titel :
Power Electronics and Drives Systems, 2005. PEDS 2005. International Conference on
Print_ISBN :
0-7803-9296-5
DOI :
10.1109/PEDS.2005.1619916
