학술논문
Linearization of class D amplifiers
Document Type
Conference
Source
Proceedings of the IEEE 2012 Custom Integrated Circuits Conference Custom Integrated Circuits Conference (CICC), 2012 IEEE. :1-4 Sep, 2012
Subject
Language
ISSN
0886-5930
2152-3630
2152-3630
Abstract
Signal dependent propagation delay and supply modulation are among the major sources of performance deterioration in class D amplifiers. More so in the case where the control of the common-mode EMI of a Class D amplifier utilizes DSP-based signal spreading techniques and requires the switching amplifier to be “linear” to avoid folding the high frequency spectrum into the audio band. This paper reviews the sources of nonlinearity and describes two original solutions based on analog feedback techniques for a 3W audio amplifier that were implemented in a 110 nm CMOS process.