Title :
A set of four ICs in CMOS technology for a programmable hearing aid
Author :
Callias, François ; Salchli, François H. ; Girard, Dominique
Author_Institution :
Centre Suisse d´´Electron. et de Microtech., Neuchatel, Switzerland
fDate :
4/1/1989 12:00:00 AM
Abstract :
A four-chip system developed for a programmable hearing aid is presented. It combines E/sup 2/PROM (electrically erasable programmable read-only memory) memories with a control logic, low-noise preamplifiers, AGC (automatic gain control) amplifiers, SC (switched-capacitor) filters, voltage multipliers, and an output amplifier of the pulse-width type. The implementation of the critical parts is explained. The 3- mu m self-aligned-contacts MOS technology of the Faselec company is used. The system is supplied by a single 1.3-V battery and its typical current consumption is 1.5 mA. The whole system can be connected to a computer.<>
Keywords :
CMOS integrated circuits; hearing aids; 1.3 V; 1.5 A; 3 micron; AGC; E/sup 2/PROM; EEPROM; Faselec company; PWM amplifiers; SC filters; automatic gain control; control logic; critical parts; current consumption; electrically erasable programmable read-only memory; four-chip system; implementation; low-noise preamplifiers; output amplifier; programmable hearing aid; self-aligned-contacts MOS technology; switched capacitor filters; voltage multipliers; Auditory system; Automatic logic units; Automatic voltage control; CMOS logic circuits; CMOS technology; Low-noise amplifiers; PROM; Preamplifiers; Programmable control; Pulse amplifiers;
Journal_Title :
Solid-State Circuits, IEEE Journal of
