An Exploratory Study of Pulse Width and Delta Sigma Modulators

<p>This paper explores the noise shaping and noise producing qualities of Delta-Sigma Modulators (DSM) and Pulse-Width Modulators (PWM). DSM has long been dominant in the Delta Sigma Analog-to-Digital Converter (DSADC) as a noise-shaped quantizer and time discretizer, while PWM, with a similar self oscillating structure, has seen use in Class D Power Amplifiers, performing a similar function. It has been shown that the PWM in Class D Amplifiers outperforms the DSM [1], but could this advantage be used in DSADC use-cases? LTSpice simulation and printed circuit board implementation and test are used to present data on four variations of these modulators: The DSM, PWM, the out-of-loop discretized PWM (OOLDP), and the cascaded modulator. A generic form of an Nth order loop filter is presented, where three orders of this generic topology are analyzed in simulation for each modulator, and two orders are used in physical testing.</p>

Name thesis:degree_name

MS in Electrical Engineering

Discipline thesis:degree_discipline

Electrical Engineering

Year dc:date.available

2020

Author dc:creator

• Penrod, Logan B

Contributors dc:contributor

• Vladimir Prodonov
• Electrical Engineering
• College of Engineering

• Delta Sigma Modulator
• Pulse Width Modulator
• Quantization Noise
• Time Discretization
• Delta Sigma Analog to Digital Conversion
• Class D Amplifier
• Controls and Control Theory
• Electronic Devices and Semiconductor Manufacturing
• Signal Processing
• Systems and Communications

Identifier

10.15368/theses.2020.167

OAI identifier oai:identifier

oai:digitalcommons.calpoly.edu:theses-3771