An Analog/Digital Mixed-Mode Audio Power Amplifier with Novel Ripple Feedback Filter

Nam-In KIM  Sang-Hwa JUNG  Gyu-Hyeong CHO  

IEICE TRANSACTIONS on Communications   Vol.E86-B   No.9   pp.2764-2767
Publication Date: 2003/09/01
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Communication Devices/Circuits
ripple filter,  analog amplifier,  digital amplifier,  efficiency,  THD,  

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A digital power amplifier is combined with an analog power amplifier via a new ripple feedback filter for high power audio amplifier. Both high fidelity and high efficiency are achieved owing to the proposed filter in combination with a dynamic control of switching frequency. A prototype having a rated power of 2 kW is built for live concert use and tested successfully.