Magnetic Sensor for Hearing Aid Application - Part 2

A project for ECE 547 "VLSI Design" - Fall Semester 2004
Department of Electrical and Computer Engineering
University of Maine

Designed by: Crystal Carr

This is the 2nd tapeout of the telecoil project. The low-noise amplifier in first run, submitted in the Fall of 2004, described in the project report suffered from an input offset error and was redesigned. The work constituted part of my M.S. thesis in Electrical Engineering which was awarded in May of 2005.

This project consists of a integrated circuit that tests two amplifiers hooked up to an integrated telecoil, as well as several test amplifier circuits. The amplifiers are based on a single stage Cherry-Hooper configuration. The single stage Cherry Hooper design is simulated at a gain of 29 dB, THD of -50dB, and equivalent input noise of 2.01nV/sqrt(Hz). The three stage Cherry Hooper design with filter is simulated at a gain of 84 dB, THD of -49dB, and equivalent input noise of 2.01nV/sqrt(Hz). The three stage amplifier also has a bandwidth of 3kHz and a driving capacity of 30pF external load capacitance.