NDLI: A CMOS smart temperature sensor with a 3/spl sigma/ inaccuracy of /spl plusmn/0.1/spl deg/C from -55/spl deg/C to 125/spl deg/C

Content Provider	IEEE Xplore Digital Library
Author	Pertijs, M.A.P. Makinwa, K.A.A. Huijsing, J.H.
Copyright Year	1966
Abstract	A smart temperature sensor in 0.7 /spl mu/m CMOS is accurate to within /spl plusmn/0.1/spl deg/C (3/spl sigma/) over the full military temperature range of -55/spl deg/C to 125/spl deg/C. The sensor uses substrate PNP transistors to measure temperature. Errors resulting from nonidealities in the readout circuitry are reduced to the 0.01/spl deg/C level. This is achieved by using dynamic element matching, a chopped current-gain independent PTAT bias circuit, and a low-offset second-order sigma-delta ADC that combines chopping and correlated double sampling. Spread of the base-emitter voltage characteristics of the substrate PNP transistors is compensated by trimming, based on a calibration at one temperature. A high trimming resolution is obtained by using a sigma-delta current DAC to fine-tune the bias current of the bipolar transistors.
Sponsorship	IEEE Solid-State Circuits Society IEEE Electron Devices Society IEEE Circuits and Systems Society Japan Society of Applied Physics (JSAP) IEEE Microwave Theory and Techniques Society IEEE San Francisco Section Bay Area Council Univ. PA IEEE
Starting Page	2805
Ending Page	2815
Page Count	11
File Size	683172
File Format	PDF
ISSN	00189200
Volume Number	40
Issue Number	12
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2005-12-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Temperature sensors Temperature measurement Circuits Delta-sigma modulation Temperature distribution Intelligent sensors Sampling methods Voltage Calibration Bipolar transistors temperature sensors Dynamic element matching offset cancellation sigma-delta conversion smart sensors
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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