High-efficiency filterless Class D amplifier with peak detector

Author

Jin, Chongfei ; Tan, Meng Tong ; See, Kye Yak

Author_Institution

Sch. of Electr. & Electron. Eng., Nanyang Technol. Univ., Singapore, Singapore

fYear

2012

fDate

14-17 March 2012

Firstpage

1

Lastpage

4

Abstract

This paper presents a fully integrated filterless Class D amplifier embodying a peak detector to improve the power efficiency at low power range. The peak detector monitors the switching frequency accordingly by sensing the amplitude of the input signal. The Class D amplifier is fabricated using 0.18μm CMOS technology with a total area of 1 mm². From our measurements, the proposed design has high power efficiency (>;86%) for a wide output power range (50 mW-700 mW). Our design maintains very good low total harmonic distortion (THD) (<;0.09%) over both entire modulation index range and the audio band of interest (100 Hz-6 kHz).

Keywords

CMOS analogue integrated circuits; low-power electronics; peak detectors; power amplifiers; CMOS technology; amplitude; audio band of interest; frequency 100 Hz to 6 kHz; fully integrated filterless class D amplifier; high power efficiency; high-efficiency filterless class D amplifier; low power range; modulation index range; peak detector; power 50 mW to 700 mW; size 0.18 mum; switching frequency; total harmonic distortion; Band pass filters; Detectors; Modulation; Power amplifiers; Power generation; Power harmonic filters; Switching frequency; filterless Class D amplifier; peak detector;

fLanguage

English

Publisher

ieee

Conference_Titel

Devices, Circuits and Systems (ICCDCS), 2012 8th International Caribbean Conference on

Conference_Location

Playa del Carmen

Print_ISBN

978-1-4577-1116-9

Electronic_ISBN

978-1-4577-1115-2

Type

conf

DOI

10.1109/ICCDCS.2012.6188910

Filename

6188910