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A Novel Boost Class‐D Amplifier Using an H‐bridge Circuit
Author(s) -
Tsuchiya Hirotaka,
Michitaka Yoshino,
Shinkawa Naoto,
Akaba Hiroyuki,
Yasuda Akira
Publication year - 2010
Publication title -
ieej transactions on electrical and electronic engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.254
H-Index - 30
eISSN - 1931-4981
pISSN - 1931-4973
DOI - 10.1002/tee.20589
Subject(s) - electrical engineering , direct coupled amplifier , linear amplifier , amplifier , operational amplifier , electronic engineering , current feedback operational amplifier , boost converter , engineering , computer science , voltage , cmos
A novel class‐D amplifier with a boost mode is proposed. It solves a problem that cannot boost the signal over a power supply voltage when a certain power supply given. The proposed amplifier can output higher voltages than the power supply voltage. Since the boost DC–DC converter circuit and the class‐D amplifier utilize similar switching circuits, the boost DC–DC function is implemented within the class‐D amplifier circuit. The half‐bridge circuit utilized in a conventional class‐D amplifier is replaced with an H‐bridge circuit. The simulation results show that the output voltage swing is twice that of the power supply voltage without an external boost DC–DC converter. The signal‐to‐noise ratio and third‐harmonic distortion are 103.5 dB and 0.0058%, respectively. Copyright © 2010 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc.