University Of Tasmania
whole_GraingerAnthonyAndre1974_thesis.pdf (16.88 MB)
Download file

Some aspects of switching amplifiers and their performance

Download (16.88 MB)
posted on 2023-05-26, 23:22 authored by Grainger, Anthony Andre, 1946-
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 discussed.


Publication status

  • Unpublished

Rights statement

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

Repository Status

  • Open

Usage metrics

    Thesis collection


    No categories selected