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A pixel-level A/D converter for the imaging array of an advanced interferometer

IP.com Disclosure Number: IPCOM000128127D
Original Publication Date: 1999-Dec-31
Included in the Prior Art Database: 2005-Sep-15
Document File: 6 page(s) / 19K

Publishing Venue

Software Patent Institute

Related People

Tadayyon, Shahram: AUTHOR [+3]

Related Documents

http://theses.mit.edu:80/Dienst/UI/2.0/Describe/0018.mit.theses/1999-122: URL

Abstract

The objective of this thesis 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- tofrequency and sigma-delta} are further analyzed because they show promise to ft in a 60 um x 60 um area and be able to perform I4-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. Thesis Supervisor: James Roberge Title: Professor of Electrical Engineering [2]

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 This record is the front matter from a document that appears on a server at MIT and is used through permission from MIT. See http://theses.mit.edu:80/Dienst/UI/2.0/Describe/0018.mit.theses/1999-122 for copyright details and for the full document in image form.

A Pixel-Level A/D Converter For the Imaging Array of an Advanced Interferometer

by

Shahram Tadayyon
Submitted in partial fulfillment of the requirements for the degree of Master of Engineering in Electrical Engineering and Computer Science

at the Massachusetts Institute of Technology

May 7, 1999 [June 1999]
(c) Copyright 1999 Shahram Tadayyon. All rights reserved.

The author hereby grants to M.I.T. permission to reproduce and distribute publicly paper and electronic copies of this thesis and to grant other the right to do so.

SIGNATURE OF author: [[signature omitted]]

Department of Electrical Engineering and Computer Science May 7,1999
CERTIFIED BY: [[SIGNATURE OMITTED]]

James Roberge Thesis Supervisor
ACCEPTED BY: [[SIGNATURE OMITTED]]

Arthur C. Smith Chairman, Department Committee on Graduate Theses ARCHIVES MASSACHUSETTS INSTITUTE OF TECHNOLOGY LIBRARIES JUL 15 1999

Massachusetts Institute of Technology Page 1 Dec 31, 1999

Page 2 of 6

A pixel-level A/D converter for the imaging array of an advanced interferometer

A Pixel-Level A/D Converter For the Imaging Array of an Advanced Interferometer

by Shahram Tadayyon

Submitted to the Department of Electrical Engineering and Computer Science

May 7, 1999

In Partial Fulfillment of the Requirements for the Degrees of Bachelor of Science in Electrical Engineering and Master of Engineering in Electrical Engineering and Computer Science

Abstract

The objective of this thesis 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- tofrequency and sigma-delta} are further analyzed because they show promise to ft in a 60 um x 60 um area and be able to perform I4-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.

Thesis Supervisor: James Roberge Title: Professor of Electrical Engineering

[2]

Acknowledgements:

I would like to acknowledge Larry Candell for his help and guidance throughout my thesis and James Roberge for his assistance...