Title :
An 80% peak efficiency, 410mW, single supply rail powered Class-I linear audio amplifier
Author :
Peng, Zhenfei ; Yang, Shanshan ; Feng, Yong ; Hong, Zhiliang ; Liu, Bill
Author_Institution :
State Key Lab. of ASIC & Syst., Fudan Univ., Shanghai, China
Abstract :
A Class-I audio amplifier with an integrated DC/DC converter implemented in 0.18-μm CMOS process is presented. Efficiency is improved by adopting a self-generated adaptive supply, which tracks the audio signal and keeps a small voltage across output transistors. The employed gain compression technique uses only one positive supply to maintain good linearity, and achieve above 20% better efficiency over a conventional Class-AB design. Without using negative supply, this Class-I amplifier is compatible with a standard CMOS process. Experimental results show that the peak efficiency is 80%. The THD+N is less than 0.06% when output power is less than 300mW for an 8Ω load.
Keywords :
CMOS analogue integrated circuits; DC-DC power convertors; audio-frequency amplifiers; power amplifiers; transistors; CMOS process; audio signal; gain compression technique; integrated DC-DC converter; output transistors; power 410 mW; self-generated adaptive supply; single supply rail powered class-I linear audio amplifier; size 0.18 mum; CMOS process; DC-DC power converters; Peak to average power ratio; Power amplifiers; Power generation; Power measurement; Rails;
Conference_Titel :
Custom Integrated Circuits Conference (CICC), 2011 IEEE
Conference_Location :
San Jose, CA
Print_ISBN :
978-1-4577-0222-8
DOI :
10.1109/CICC.2011.6055395
