Date of Award

Spring 1996

Document Type

Thesis

Degree Name

Master of Science in Electrical Engineering - (M.S.)

Department

Electrical and Computer Engineering

First Advisor

William N. Carr

Second Advisor

Siu Bor Lau

Third Advisor

Kenneth Sohn

Abstract

This thesis describes the design, implementation and test for a new CMOS analog-to-digital converter IC chip. In designing the analog-to-digital converter in this thesis a radically different comparator design that is only available with CMOS logic. The design utilizes a single CMOS inverter as an ultra-high gain amplifier. This approach reduces the circuit dependence upon matching of the transistors similar to the traditional method. This new design requires less area since the comparator utilizes fewer transistors.

Flash analog-to-digital converters use 2" - 1 comparators to do a single conversion where n is the number of bits used. These comparators are traditionally made with differential transistor amplifiers in order to obtain matched characteristics. Effects of mismatch in current gains and base emitter voltage is reduced in the new design since the amplifier topology does not depend entirely upon perfectly matched transistors.

Share

COinS