Title :
A Class-G/FB Audio Amplifier
Author :
Downey, Adam D. ; Wierzba, Gregory M.
Author_Institution :
Aerosp. & Defense Group, Sterling Heights
Abstract :
A class-G amplifier is a power amplifier that can achieve better power efficiency than the class-B amplifier. For these amplifiers, low distortion is achieved with large values of power supply voltage. A new class-G/FB amplifier is proposed using an operational amplifier with a class-G power stage and feedback to lower the total harmonic distortion of the amplifier rather than using large power supply voltages. Methods for identifying and solving the stability problems associated with this class-G/FB amplifier are presented. The efficiency of this amplifier is examined along with experimental results.
Keywords :
audio-frequency amplifiers; operational amplifiers; power amplifiers; amplifier harmonic distortion; class-G amplifier; class-G power stage; class-G/FB audio amplifier; operational amplifier; power amplifier; power efficiency; power supply voltage; Circuit stability; Feedback; Operational amplifiers; Power amplifiers; Power supplies; Radiofrequency amplifiers; Schottky diodes; Switches; Total harmonic distortion; Voltage;
Journal_Title :
Consumer Electronics, IEEE Transactions on
DOI :
10.1109/TCE.2007.4429249
