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Sensors 2009, 9(5), 3652-3665; doi:10.3390/s90503652

Digitally Programmable Analogue Circuits for Sensor Conditioning Systems

2,* , 3
1 Teltronic S.A.U., R&D Department, Polígono Malpica, calle F-Oeste, 50057 Zaragoza, Spain 2 Group of Electronic Design, Aragon Institute for Engineering Research, I3A, Facultad de Ciencias, Pedro Cerbuna 12, 50009 Zaragoza, Spain 3 Instituto Nacional de Astrofísica, Óptica y Electrónica, Luis Enrique Erro # 1, Tonantzintla, Puebla, Mexico
* Author to whom correspondence should be addressed.
Received: 16 April 2009 / Revised: 12 May 2009 / Accepted: 13 May 2009 / Published: 14 May 2009
(This article belongs to the Special Issue Neural Networks and Sensors)
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This work presents two current-mode integrated circuits designed for sensor signal preprocessing in embedded systems. The proposed circuits have been designed to provide good signal transfer and fulfill their function, while minimizing the load effects due to building complex conditioning architectures. The processing architecture based on the proposed building blocks can be reconfigured through digital programmability. Thus, sensor useful range can be expanded, changes in the sensor operation can be compensated for and furthermore, undesirable effects such as device mismatching and undesired physical magnitudes sensor sensibilities are reduced. The circuits were integrated using a 0.35 mm standard CMOS process. Experimental measurements, load effects and a study of two different tuning strategies are presented. From these results, system performance is tested in an application which entails extending the linear range of a magneto-resistive sensor. Circuit area, average power consumption and programmability features allow these circuits to be included in embedded sensing systems as a part of the analogue conditioning components.
Keywords: sensor readout circuits; electronics for sensor conditioning; neural networks circuits sensor readout circuits; electronics for sensor conditioning; neural networks circuits
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Zatorre, G.; Medrano, N.; Sanz, M.T.; Aldea, C.; Calvo, B.; Celma, S. Digitally Programmable Analogue Circuits for Sensor Conditioning Systems. Sensors 2009, 9, 3652-3665.

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