Masters Theses

Date of Award

12-2003

Degree Type

Thesis

Degree Name

Master of Science

Major

Electrical Engineering

Major Professor

Dr. Benjamin J. Blalock

Committee Members

Dr. Syed K. Islam, Dr. Donald W. Bouldin

Abstract

This thesis presents the design and implementation of a power management integrated circuit (IC) that is capable of both current and voltage charging thin-film, solid-state, lithium-ion micro-batteries. The power management system has been fabricated using a single-poly, 0.35-ìm, partially-depleted, silicon-on-insulator process (PD-SOI). The system contains a temperature stable current charger (current generator and a 4-bit current-mode DAC), a regulated voltage supply (voltage amplifier), and a voltage monitoring circuit (2-bit flash ADC). Experimental results of the first version of the power management system show proper functionality was obtained. The current charger produced a 2% worst-case variation in output current over the temperature range 0–100°C. The regulated voltage output was measured to be 4.4 V and the digital outputs of the flash ADC transitioned at 3.45 and 4.76 V.

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