A pixel-level A/D converter for the imaging array of an advanced interferometer
Name
43573451-MIT.pdf
Description
Full printable version
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4.59 MB
Format
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Checksum (MD5)
6882688f77f12198c241be2975b35164
Author(s)
Tadayyon, Shahram (Shahram Tadayyon), 1975-
Advisor(s)
James Roberge.
Alternative Title
Pixel-level analog-to-digital converter for the imaging array of an advanced interferometer
Date Issued
1999
Publisher
Massachusetts Institute of Technology
Abstract
The objective of this thesis is to investigate the feasibility of pixel-level analog-to-digital conversion as a solution for the imaging array of the advanced interferometer project at Lincoln Laboratory. Six different pixel-level analog-to-digital conversion methods are examined. Four of the conversion methods are discarded after preliminary analysis because accuracy requirements cannot be met given the high-speed and area constraints. Two of these conversion techniques (voltage-to-frequency and sigma-delta). are further analyzed because they show promise to fit in a 60 [mu]m x 60 [mu]m area and be able to perform 14-bit, analog-to-digital conversion at frame rates of 5000 Hz. As a result of the analysis, the voltage-to-frequency converter is also discarded because comparator inconsistencies degrade the accuracy below specifications. The sigma-delta converter individually meets the imaging array requirements, but high power supply dissipation, large parasitic capacitance and noise introduce by other converters make pixel-level sigma-delta conversion impractical with current technology.
Description
Thesis (S.B. and M.Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1999.
Includes bibliographical references (p. 84).
Subjects
Electrical Engineering and Computer Science
MIT Department
Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science
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