A High-Voltage Class-D Power Amplifier With Switching Frequency Regulation for Improved High-Efficiency Output Power Range

Author

Haifeng Ma ; van der Zee, Ronan ; Nauta, Bram

Author_Institution

CTIT Inst., Univ. of Twente, Enschede, Netherlands

Volume

50

Issue

6

fYear

2015

fDate

Jun-15

Firstpage

1451

Lastpage

1462

Abstract

This paper describes the power dissipation analysis and the design of an efficiency-improved high-voltage class-D power amplifier. The amplifier adaptively regulates its switching frequency for optimal power efficiency across the full output power range. This is based on detecting the switching output node voltage level at the turn-on transition of the power switches. Implemented in a 0.14 μm SOI BCD process, the amplifier achieves 93% efficiency at 45 W output power, > 80% power efficiency down to 4.5 W output power and > 49% efficiency down to 0.45 W output power.

Keywords

frequency control; power amplifiers; silicon-on-insulator; SOI BCD process; efficiency 93 percent; high-efficiency output power range; high-voltage class-D power amplifier; optimal power efficiency; power 45 W; power dissipation analysis; power switch; silicon-on-insulator; size 0.14 mum; switching frequency regulation; Analytical models; Inductors; Logic gates; Power generation; Soft switching; Switches; Switching frequency; Class-D amplifier; efficiency optimization; hard switching; high voltage; piezo driver; power efficiency; soft switching; switching frequency; switching loss;

fLanguage

English

Journal_Title

Solid-State Circuits, IEEE Journal of

Publisher

ieee

ISSN

0018-9200

Type

jour

DOI

10.1109/JSSC.2015.2421994

Filename

7098449