High Precision 16-bit Readout Gas Sensor Interface in $0.13\mu m \hspace{2mm} CMOS$

Jayaraman, Balaji and Bhat, Navakanta (2007) High Precision 16-bit Readout Gas Sensor Interface in $0.13\mu m \hspace{2mm} CMOS$. In: IEEE International Symposium on Circuits and Systems:ISCAS 2007, 27-30 May 2007, New Orleans, LA, USA, pp. 3071-3074.

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Abstract

A high precision 16-bit readout circuit for gas sensor interface is realized in $0.13 \mu m \hspace{2mm}CMOS$ technology. The front end signal conditioning circuit comprises a low power resistance-to-time period converter with subthreshold operation of transistors. The time-period proportional to the transducer output is digitized using a counter based frequency-to-digital conversion (FDC) technique. In order to handle the sensor signal with a dynamic range of 160dB, subranging technique is employed to provide feedback to front end circuit interfacing the sensor. While the 3 MSBs of 16-bit word restrict the input frequency to FDC between 1MHz and 10MHz, the 13-bit counter operates on this signal to provide a worst case resolution of 0.4%. The power consumption of the readout circuit is $366\mu W$ from a 1.2V supply.

Item Type:	Conference Paper
Publisher:	IEEE
Additional Information:	Copyright 2006 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.
Keywords:	CMOS integrated circuits;gas sensors;power consumption;readout electronics;signal processing equipment
Department/Centre:	Division of Electrical Sciences > Electrical Communication Engineering
Date Deposited:	14 Aug 2007
Last Modified:	19 Sep 2010 04:38
URI:	http://eprints.iisc.ac.in/id/eprint/11684

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