A low-voltage low-power fully-integratable automatic gain control for hearing instruments

Author

Serdijn, Wouter A. ; van der Woerd, Albert C. ; Davidse, Jan ; Van Roermund, Arthur H M

Author_Institution

Dept. of Electr. Eng., Delft Univ. of Technol., Netherlands

Volume

29

Issue

8

fYear

1994

fDate

8/1/1994 12:00:00 AM

Firstpage

943

Lastpage

946

Abstract

A low-voltage low-power bipolar automatic gain control (AGC) for hearing instruments that works in the current domain and operates on a single 1.3-V battery is presented. In this AGC a large time constant (50 ms) is realized on-chip. The AGC consists of a gain cell, a comparator and a voltage follower. The active circuitry of the AGC has been integrated in the DIMES01 process and the total circuit demonstrates operation down to 1 V with only 4 μW power consumption. The compression range amounts to 38 dB. The AGC has a dynamic range (DR) of 62 dB at the output over a bandwidth of 10 kHz

Keywords

BiCMOS integrated circuits; analogue processing circuits; audio-frequency amplifiers; automatic gain control; hearing aids; linear integrated circuits; 1.3 V; 10 kHz; 4 muW; DIMES01 process; LV type; automatic gain control; comparator; compression range; current domain operation; gain cell; hearing instruments; low-power AGC; low-voltage operation; power consumption; single 1.3 V battery; voltage follower; Auditory system; Automatic control; Batteries; Circuits; Dynamic range; Gain control; Instruments; Knee; Pressure control; Voltage;

fLanguage

English

Journal_Title

Solid-State Circuits, IEEE Journal of

Publisher

ieee

ISSN

0018-9200

Type

jour

DOI

10.1109/4.297699

Filename

297699