Title :
Fast switching charge dump assisted Class-D audio amplifier with high fidelity and high efficiency
Author :
Lee, Kwang-Chan ; Chae, Chang-Seok ; Lee, Kang-Ho ; Cho, Gyu-Hyeong
Author_Institution :
KAIST/EECS, Daejeon
Abstract :
A fast switching charge dump assisted class-D audio amplifier is presented in this paper. To achieve high efficiency and high linearity, the Class-K* audio amplifier consists of the class D amplifier with high efficiency and the proposed charge dump amplifier with high linearity. The charge pump amplifier works at faster switching frequency than class D amplifier so as to compensate the distortion caused by switching of the class-D amplifier. The class-K* audio amplifier implemented in 0.35mum CMOS process shows -71.8 dB THD+N at 1 KHz and a maximum efficiency of 81% at an output power of 257 mW for 4.1Omega load.
Keywords :
CMOS integrated circuits; audio-frequency amplifiers; CMOS process; Class-D audio amplifier; Class-K audio amplifier; charge dump amplifier; efficiency 81 percent; fast switching charge dump; frequency 1 kHz; power 257 mW; power output; resistance 4.1 ohm; size 0.35 mum; CMOS process; Driver circuits; High power amplifiers; Linearity; Operational amplifiers; Power amplifiers; Power capacitors; Switching frequency; Topology; Voltage;
Conference_Titel :
Power Electronics Specialists Conference, 2008. PESC 2008. IEEE
Conference_Location :
Rhodes
Print_ISBN :
978-1-4244-1667-7
Electronic_ISBN :
0275-9306
DOI :
10.1109/PESC.2008.4592498
