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A Low-Voltage Low-Power Fully-Integratable Front-End for Hearing Instruments

Serdijn, WA; van der Woerd, AC; Davidse, J; van Roermund, AHM; (1995) A Low-Voltage Low-Power Fully-Integratable Front-End for Hearing Instruments. IEEE Transactions on Circuits and Systems I: Fundamental Theory and Applications , 42 (11) pp. 920-932. 10.1109/81.477203.

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Abstract

In this paper, the front-end of a universally applicable analog integrated circuit for hearing instruments is presented. This IC comprises the following functions: a microphone preamplifier, a pickup-coil preamplifier, a second-order high-pass filter and a second-order Low Pass filter, both with a controllable cutoff frequency, and an input-controlled automatic gain control with an adjustable knee level. By applying a compression/expansion system and operating all the circuits in the current domain as much as possible, all these functions can be implemented in a single IC, without the need for external components. The test chip demonstrates operation down to 1.05 V and a current consumption between 120 and 175 µA, The full-custom chip area in a 2.5-µm BiCMOS process (using only vertical NPN’s and lateral PNF’s) amounts to 2.4 mm2. © 1995 IEEE.

Type: Article
Title: A Low-Voltage Low-Power Fully-Integratable Front-End for Hearing Instruments
DOI: 10.1109/81.477203
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Electronic and Electrical Eng
URI: http://discovery.ucl.ac.uk/id/eprint/1528387
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