| 4/2015 - 13 |
An Electronically Tunable Transconductance Amplifier for Use in Auditory ProsthesesFARAGO, P.   , FARAGO, C. , OLTEAN, G. , HINTEA, S. |
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Author keywords
analog processing circuits, cochlear implants, low-power electronics, operational transconductance amplifier, programmable circuits
References keywords
cmos(8), circuits(7), amplifier(6), systems(4), signal(4), sarpeshkar(4), processing(4), power(4), farago(4), design(4)
Blue keywords are present in both the references section and the paper title.
About this article
Date of Publication: 2015-11-30
Volume 15, Issue 4, Year 2015, On page(s): 95 - 100
ISSN: 1582-7445, e-ISSN: 1844-7600
Digital Object Identifier: 10.4316/AECE.2015.04013
Web of Science Accession Number: 000368499800012
SCOPUS ID: 84949945758
Abstract
Low-voltage and low-power trends in analog electronics enable novel features in modern bio-medical devices, such as extensive portability, autonomy and even battery-less operation. One specific example is the cochlear implant (CI), which emulates the physiology of hearing to produce auditory sensations via neural stimulation. Besides low-voltage and low-power operation, a key feature in modern CIs is wide-range programmability of the speech processing parameters. This paper proposes an operational transconductance amplifier (OTA) for use in CIs, with wide-range electronic tuning of the transconductance value. The proposed OTA is developed around a cascade of two transconductor stages, making the transconductance dependent on the bias current ratio. A combination of linearization techniques: bulk input, parallel differential pairs and feedback, is used to achieve sufficient linear range for CI speech processing. Wide-range parameter tuning of the speech processing sections is illustrated on a variable gain amplifier, a bandpass Tow-Thomas biquad and an envelope detector. Finally, the complete CI speech processing chain is illustrated. The proposed OTA and its employment in CI analog speech processing are validated on a 350 nm CMOS process. |
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[1] A Programmable Biopotential Aquisition Front-end with a Resistance-free Current-balancing Instrumentation Amplifier, FARAGO, P., GROZA, R., HINTEA, S., SOSER, P., Advances in Electrical and Computer Engineering, ISSN 1582-7445, Issue 2, Volume 18, 2018.
Digital Object Identifier: 10.4316/AECE.2018.02011 [CrossRef] [Full text]
[2] An electronically programmable current balancing instrumentation amplifier for biomedical monitoring, Farago, Paul, Cirlugea, Mihaela, Hintea, Sorin, 2016 39th International Conference on Telecommunications and Signal Processing (TSP), ISBN 978-1-5090-1288-6, 2016.
Digital Object Identifier: 10.1109/TSP.2016.7760876 [CrossRef]
[3] A digital control mechanism for the delay of a dual-microphone analog beamformer, Farago, Paul, Hintea, Sorin, Sandu, Florin, 2017 International Conference on Optimization of Electrical and Electronic Equipment (OPTIM) & 2017 Intl Aegean Conference on Electrical Machines and Power Electronics (ACEMP), ISBN 978-1-5090-4489-4, 2017.
Digital Object Identifier: 10.1109/OPTIM.2017.7975067 [CrossRef]
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Faculty of Electrical Engineering and Computer Science
Stefan cel Mare University of Suceava, Romania
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Faculty of Electrical Engineering and Computer Science
Stefan cel Mare University of Suceava, Romania
All rights reserved: Advances in Electrical and Computer Engineering is a registered trademark of the Stefan cel Mare University of Suceava. No part of this publication may be reproduced, stored in a retrieval system, photocopied, recorded or archived, without the written permission from the Editor. When authors submit their papers for publication, they agree that the copyright for their article be transferred to the Faculty of Electrical Engineering and Computer Science, Stefan cel Mare University of Suceava, Romania, if and only if the articles are accepted for publication. The copyright covers the exclusive rights to reproduce and distribute the article, including reprints and translations.
Permission for other use: The copyright owner's consent does not extend to copying for general distribution, for promotion, for creating new works, or for resale. Specific written permission must be obtained from the Editor for such copying. Direct linking to files hosted on this website is strictly prohibited.
Disclaimer: Whilst every effort is made by the publishers and editorial board to see that no inaccurate or misleading data, opinions or statements appear in this journal, they wish to make it clear that all information and opinions formulated in the articles, as well as linguistic accuracy, are the sole responsibility of the author.
