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151846 https://hdl.handle.net/2286/R.I.18021 http://rightsstatements.org/vocab/InC/1.0/ All Rights Reserved 2013 ix, 60 p. : ill Masters Thesis Academic theses Text eng Peterson, Cory Bakkaloglu, Bertan Barnaby, Hugh Kiaei, Sayfe Arizona State University Partial requirement for: M.S., Arizona State University, 2013 Includes bibliographical references (p. 59-60) Field of study: Electrical engineering Efficiency of components is an ever increasing area of importance to portable applications, where a finite battery means finite operating time. Higher efficiency devices need to be designed that don't compromise on the performance that the consumer has come to expect. Class D amplifiers deliver on the goal of increased efficiency, but at the cost of distortion. Class AB amplifiers have low efficiency, but high linearity. By modulating the supply voltage of a Class AB amplifier to make a Class H amplifier, the efficiency can increase while still maintaining the Class AB level of linearity. A 92dB Power Supply Rejection Ratio (PSRR) Class AB amplifier and a Class H amplifier were designed in a 0.24um process for portable audio applications. Using a multiphase buck converter increased the efficiency of the Class H amplifier while still maintaining a fast response time to respond to audio frequencies. The Class H amplifier had an efficiency above the Class AB amplifier by 5-7% from 5-30mW of output power without affecting the total harmonic distortion (THD) at the design specifications. The Class H amplifier design met all design specifications and showed performance comparable to the designed Class AB amplifier across 1kHz-20kHz and 0.01mW-30mW. The Class H design was able to output 30mW into 16Ohms without any increase in THD. This design shows that Class H amplifiers merit more research into their potential for increasing efficiency of audio amplifiers and that even simple designs can give significant increases in efficiency without compromising linearity. Electrical Engineering Audio amplifiers Class H Efficiency Multiphase Buck Audio amplifiers--Design and construction. Audio amplifiers Design and analysis of a dual supply class H audio amplifier