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Class E amplifiers and their modulation behaviour

Kimber, David Paul (2006)
Ph.D. thesis, University of Birmingham.

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Abstract

The Class E power amplifier has very high drain efficiency under quasi-static conditions, and is a good candidate for Envelope Elimination and Restoration (EER) or other polar techniques. Unfortunately it has an unusual carrier frequency response, for which no analytic expression was known; this may have limited commercial use of the circuit. Two new steady state analyses are presented, which give the carrier frequency response in simple form, together with expressions for component values. Good agreement with measured data and existing numerical solutions is seen. Previous attempts at characterising the amplitude modulation (AM) behaviour of this circuit have assumed that it can be modelled as a first order low pass filter. It is shown that Class E AM can be modelled as an equivalent circuit, which behaves as a second order low pass filter. Measurements confirm the analysis.

Type of Work:Ph.D. thesis.
Supervisor(s):Gardner, Peter
School/Faculty:Schools (1998 to 2008) > School of Engineering
Department:Electronic, Electrical and Computer Engineering
Keywords:Class E, modulation, high efficiency, frequency response, EER, radio transmitter, switch mode, power amplifier, modelling
Subjects:TK Electrical engineering. Electronics Nuclear engineering
Institution:University of Birmingham
Library Catalogue:Check for printed version of this thesis
ID Code:3
This unpublished thesis/dissertation is copyright of the author and/or third parties. The intellectual property rights of the author or third parties in respect of this work are as defined by The Copyright Designs and Patents Act 1988 or as modified by any successor legislation. Any use made of information contained in this thesis/dissertation must be in accordance with that legislation and must be properly acknowledged. Further distribution or reproduction in any format is prohibited without the permission of the copyright holder.
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