Date of Final Oral Examination (Defense)

5-2010

Type of Culminating Activity

Thesis

Degree Title

Master of Science in Electrical Engineering

Department

Electrical and Computer Engineering

Major Advisor

R. Jacob Baker, Ph.D.

Abstract

A delta-sigma modulation analog-to-digital converter (ADC) has many benefits over the use of a pipeline ADC in a CMOS image sensor. These benefits include lower power, noise reduction, ease of maximizing the input range, and simpler signal routing for large arrays. Multiple delta-sigma modulation ADCs are required in a CMOS image sensor, one for each pixel column. Any voltage threshold mismatch between ADCs will introduce gain and offset errors in the ADC's transfer function. These errors will lead to fixed-pattern noise. Correcting gain and offset error for every ADCs in the image sensor will require a complex digital signal processor. This thesis presents techniques to minimize the effects of gain and offset errors in delta-sigma modulation ADCs for CMOS image sensors.

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