Title :
A BiFET automatic gain control amplifier for hearing aids
Author :
Sykes, Frederick E. ; Armstrong, Stephen
Author_Institution :
Res. & Dev., GENNUM Corp., Burlington, Ont., Canada
Abstract :
This paper describes an audio band automatic gain control (AGC) amplifier implemented in Bipolar/JFET(Vp=0.3 V) technology and is targeted for high performance hearing aid applications. A unique AGC topology was used where the AGC function is split into feedback and feedforward sections. The amplifier provides variable compression ratios from 1:1 to 4:1 compression, 4 pole bandsplit filter, and dualtime constant average signal detection. The single IC consumes only 0.3 mW from a 1 V supply
Keywords :
audio-frequency amplifiers; automatic gain control; biomedical electronics; hearing aids; monolithic integrated circuits; 0.3 mW; 1 V; AGC topology; BiFET automatic gain control amplifier; Bipolar/JFET IC; audio band amplifier; compression ratio; dualtime constant average signal detection; feedback; feedforward; four pole bandsplit filter; hearing aid; Auditory system; Detectors; Dynamic range; Feedback; Filters; Frequency; Gain control; Hearing aids; Rectifiers; Resistors;
Conference_Titel :
Custom Integrated Circuits Conference, 1996., Proceedings of the IEEE 1996
Conference_Location :
San Diego, CA
Print_ISBN :
0-7803-3117-6
DOI :
10.1109/CICC.1996.511090
