Title :
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
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;
Journal_Title :
Solid-State Circuits, IEEE Journal of
DOI :
10.1109/JSSC.2015.2421994
