A Low-Voltage Low-Power Fully-Integratable Automatic Gain Control for Hearing Instruments
Wouter A. Serdijn, Arthur H. M. van Roermund · Research Repository (Delft University of Technology) · 1993
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 pW 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.