Faculty Advisor

Brian M. King

Faculty Advisor

John A. McNeill

Faculty Advisor

Fred J. Looft

Abstract

The performance of a dedicated A/D converter located beneath each pixel is explored in this thesis. Specifically, a voltage to frequency converter coupled with a direct injection amplifier designed for use with an IR focal plane array is analyzed. This versatile implementation of a Readout Integrated Circuit can be found applicable to a wide variety of imaging technologies. Noise performance of the conversion system is theoretically calculated, and is supported by SPICE simulations using valid CMOS SPICE models. It is shown that a 10 transistor sub-pixel voltage to frequency analog to digital converter will produce noise that is less than the input shot noise. Design considerations will be addressed to ensure continued performance as the scale of the imagers increase to large format arrays.

Publisher

Worcester Polytechnic Institute

Degree Name

MS

Department

Electrical & Computer Engineering

Project Type

Thesis

Date Accepted

2007-01-09

Accessibility

Unrestricted

Subjects

Sub-Pixel, A/D, Voltage-To-Frequency, Converter, Noise Analysis, Simulation, IR, Focal Plane Array, FPA

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