Fast switching charge dump assisted Class-D audio amplifier with high fidelity and high efficiency

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 amp...

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Bibliographic Details
Main Authors: Kwang-Chan Lee, Chang-Seok Chae, Kang-Ho Lee, Gyu-Hyeong Cho
Format: Conference Proceeding
Language:English
Subjects:
Chromium
Driver circuits
Generators
Logic gates
Power capacitors
Switches
Topology
Online Access:Request full text
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Summary: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.
ISSN:0275-9306
2377-6617
DOI:10.1109/PESC.2008.4592498