Digital Pulse Width Modulation: Analysis, Algorithms, and Applications
Song, Zukui
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Permalink
https://hdl.handle.net/2142/80772
Description
Title
Digital Pulse Width Modulation: Analysis, Algorithms, and Applications
Author(s)
Song, Zukui
Issue Date
2002
Doctoral Committee Chair(s)
Sarwate, Dilip V.
Department of Study
Electrical Engineering
Discipline
Electrical Engineering
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Engineering, Electronics and Electrical
Language
eng
Abstract
When the input to a PWM modulator is a sequence of uniformly spaced samples of the original signal, the resulting uniform-sampling PWM signal has high distortion. It is possible to eliminate the distortion completely by converting the uniform-sampling input sequence into a natural-sampling sequence before applying it to the PWM modulator. In this thesis, it is shown that it is possible to express the natural-sampling sequence exactly in terms of the derivatives of the input signal raised to various powers. Since the input signal is known only through its sample values, numerical methods are used to devise high-accuracy, low-computational-complexity, methods for computing the natural-sampling sequence from the uniform-sampling sequence. To simplify the implementation of real applications, the noise shaping technique is employed to reduce the resolution of quantization without compromising the signal to quantization noise ratio.
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