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Some aspects of switching amplifiers and their performance


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Grainger, Anthony Andre,1946- 1977 , 'Some aspects of switching amplifiers and their performance', PhD thesis, University of Tasmania.

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Chapter I examines current usage and
existing theory of switching amplifiers. Areas where
existing or potential usage extend beyond published
theory are defined, the most important area being the
lack of adequate switching wave descriptions. The
work aimed at redressing the imbalance between theory
and practice is described and its relationship to the
thesis outlined.
In Chapter II the steps necessary to form
a switching wave description are outlined. The
amplifier features incorporated include details of the
encoder, the switch array, and the control signals
which flow between encoder and switch array. The
input-output characteristic and other design features
are combined with the requirements of the encoder and
switch array to define restrictions on the switch
control signals and the switching wave.
In Chapter III detailed switching waveform
descriptions are derived for waves controlled by
natural samplers, modified natural samplers, and
regular samplers. The low frequency components of
the descriptions are used to define the sampling wave
shapes needed to achieve specific input-output
characteristics for amplifiers with both d.c. and a.c.
supply waveforms. A modified natural sampler is
described which permits compensation for arbitary
supply waveform perturbations. The high frequency
components of the waveforms are an important by-product
of the method of derivation.
In Chapter IV the fidelity of information
transfer through switching amplifiers is examined.
The waveform descriptions are used to evaluate the
spectrum of passband noise for natural and regular sampling
control with both d.c. and a.c. supplies.
The inter-relationship between signal quality, bandwidth,
and sampling rate is derived for each amplifier,
and comparisons are made between amplifiers.
Chapter V provides a basis for the analysis
of the low frequency performance of switching amplifiers
embedded in feedback networks. The application of the
analysis to amplifiers using any form of natural
sampling is demonstrated and the extension to regular
sampling outlined. The method described also provides
criteria not previously described elsewhere.
Chapter VI deals with the class of self-oscillating
encoders based on a linear filter feedback
path and a comparator with hysteresis. The performance
limits of the simplest system are described. A method
for predicting the d.c. input-output characteristic of
all such encoders is presented and its application to
two particular encoders discussed.
Chapter VII describes a switching amplifier
from the point of view of energy flow from source to
load. The restrictions on amplifier structure and
performance imposed by this view, and by real components,
are outlined and some of the limits imposed by present
hardware briefly discussed. An equivalent circuit for
the energy flow path incorporates many of the features

Item Type: Thesis - PhD
Authors/Creators:Grainger, Anthony Andre,1946-
Keywords: Amplifiers (Electronics), Switching theory
Copyright Holders: The Author
Copyright Information:

Copyright 1974 the Author - The University is continuing to endeavour to trace the copyright
owner(s) and in the meantime this item has been reproduced here in good faith. We
would be pleased to hear from the copyright owner(s).

Additional Information:

Thesis (Ph.D.)--University of Tasmania, 1974. Includes bibliography

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