Title :
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
fDate :
8/1/1994 12:00:00 AM
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;
Journal_Title :
Solid-State Circuits, IEEE Journal of
