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• W2587495988 abstract "The growing demand of “System on a Chip” applications nececitates integration of multiple devices on the same chip. Analog to Digital conversion is essential to interfacing digital systems to external devices such as sensors. This presents a difficulty since high precision analog devices do not mix well with high speed digital circuits. The digital environment constraints put demand on the analog portion to be resource efficient and noise tolerant at the same time. Even more demanding, Analog to Digital converters must consume a small amount of power since “System on a Chip” circuits often target portable applications. Analog to digital conversion based on Delta Sigma modulation offers an optimal solution to the above problems. It is based on digital signal processing theory and offers benefits such as small footprint, high precision, noise de-sensitivity, and low power consumption. This thesis presents a methodology for designing low power Delta Sigma modulators using a combination of modern circuit design techniques. The developed techniques have resulted in several modulators that satisfy the initial design parameters. We applied this method to design three different modulators in the 0.35um digital CMOS technology with a 3.3V supply voltage. A first order Self-Referenced modulator has a resolution of 8 bits and the lowest power consumption at 75 uW. The most successful design is the second order Self Referenced modulator that produces 12 bits of resolution with a power consumption of 87 uW. A second order Floating Gate modulator posesses features for high noise rejection, and produces 10 bits of resolution while consuming 276 uW. It is concluded that self-referenced modulators dissipate less power and offer higher performance as compared more complicated circuits such as the floating gate modulator. Mikhail Itskovich Design of a Delta Sigma Modulator for Low Power Analog to Digital Conversion Page iii ACKNOWLEDGEMENTS The author would like to thank his Graduate Advisor at Virginia Tech, Dr. Dong S. Ha for keeping him on track and setting realistic timelines for completing this lengthy project. This paper would have been difficult to conceive without such guidance. I would like to extend my thanks to the graduate committee members Dr. Jeffrey Reed and Dr. Joseph Tront for exibiting interest in my work. A thanks goes to Dr. Harry Eaton of the Applied Physics Laboratories at Johns Hopkins University for introducing the concept of Delta Sigma modulation to me. His class sparked author’s initial interest in this research area, that eventually evolved into a graduate thesis. A thanks to Dr. Dennis Sweeney from Virginia Tech, for casual insight into feedback and communication systems, which has been helpful in understanding and documenting the underlying theories in this paper. A word of great appreciation goes to R. Steven Jahnige of Atmel Co. for providing a stimulating work envirinement and constant encouragement in my pusuit of higher education. It is under his supervision that I developed interests in analog design and a higher level of research, and this motivation has been the driving force in completing this project. A recognition goes to Daniel J. Meyer and Anton Dvorak of the Atmel Co. for their constructive feedback and helpful suggestions throughout the length of this endevor. Their comments have helped to make this project practical and compliant with the industry standards, and their day to day availability has made this work a better experience. Finally, I would like to thank my family, my parents Gregory and Rozana and my brother Leonard for driving me to excellence throughout my life. My work is as much their achievement as it is my own. Mikhail Itskovich Design of a Delta Sigma Modulator for Low Power Analog to Digital Conversion Page iv Table of" @default.
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• W2587495988 date "2003-09-01" @default.
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• W2587495988 title "Design of a Low Power Delta Sigma Modulator for Analog to Digital Conversion" @default.
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