Linearization of class D amplifiers

Author

Balmelli, Pio ; Khoury, John ; Viegas, Eduardo ; Santos, Paulo ; Pereira, Vasco

Author_Institution

Silicon Labs., Inc., Austin, TX, USA

fYear

2012

fDate

9-12 Sept. 2012

Firstpage

1

Lastpage

4

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.

Keywords

CMOS integrated circuits; audio-frequency amplifiers; electromagnetic interference; CMOS process; DSP-based signal spreading techniques; analog feedback techniques; audio amplifier; audio band; class D amplifiers; common-mode EMI; high frequency spectrum; linearization of; performance deterioration; signal dependent propagation delay; size 110 nm; supply modulation; switching amplifier; Delay; Patents; Propagation delay; Pulse width modulation; Signal to noise ratio;

fLanguage

English

Publisher

ieee

Conference_Titel

Custom Integrated Circuits Conference (CICC), 2012 IEEE

Conference_Location

San Jose, CA

ISSN

0886-5930

Print_ISBN

978-1-4673-1555-5

Electronic_ISBN

0886-5930

Type

conf

DOI

10.1109/CICC.2012.6330567

Filename

6330567