High-efficiency filterless Class D amplifier with peak detector
Tan, Meng Tong
See, Kye Yak
Date of Issue2012
International Caribbean Conference on Devices, Circuits and Systems (8th : 2012 : Playa del Carmen, Mexico)
School of Electrical and Electronic Engineering
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).
DRNTU::Engineering::Electrical and electronic engineering
© 2012 IEEE.