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A low-power wide-range interface circuit for nanowire sensor array based on resistance-to-frequency conversion technique

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3 Author(s)
Haiqi Liu ; Institute for Infocomm Research, Singapore 138632 ; Tee Hui Teo ; Yue Ping Zhang

A traditional oscillator approach which implements the resistance-to-frequency conversion is shown to be effectively used as interface circuit for nanowire sensor array. The interface readout circuit is configurable in terms of output frequency and achieves a highly linear detection range over sensor resistance of 1 M¿ to 1 G¿ without any calibration system. A three-bit digitally-controlled current-starved ring oscillator is presented to oversample the resistance-to-frequency conversion result for following data processing.

Published in:

Proceedings of the 2009 12th International Symposium on Integrated Circuits

Date of Conference:

14-16 Dec. 2009