High linear voltage references for on-chip CMOS smart temperature sensor from -60°C to 140°C

Joseph Tso Sheng Tsai, Her-Ming Chiueh

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

12 Scopus citations

Abstract

A low-cost and high linear voltage reference circuitry is designed and implemented in TSMC 0.18μm CMOS technology. Previous research has proposed the use of MOS transistors operated in the weak inversion region to replace the bipolar devices with conventional PTAT (proportional to absolute temperature) circuits. However, such solutions often cause linearity problem in high temperature region because of the current leaking devices in modern deep sub micron and nano-scale CMOS technology. The proposed circuit utilized temperature complementation technique on two voltage references, PTAT and IOAT (independent of absolute temperature) references, to enhance the linearity and produce a stable IOAT voltage reference. Based on the measurement results, the R-square of PTAT reference is better than 0.9 and the temperature coefficient of IOAT reference is 14 ppm/°C in a considerable wider temperature range from -60°C to 140°C. The occupied chip area is 0.00126 mm2. Thus, a fully integrated temperature sensor with wider temperature range is designed and easily to integrate to modern system-on-chip designs with minimal efforts.

Original languageEnglish
Title of host publication2008 IEEE International Symposium on Circuits and Systems, ISCAS 2008
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages2689-2692
Number of pages4
ISBN (Print)9781424416844
DOIs
StatePublished - 1 Jan 2008
Event2008 IEEE International Symposium on Circuits and Systems, ISCAS 2008 - Seattle, WA, United States
Duration: 18 May 200821 May 2008

Publication series

NameProceedings - IEEE International Symposium on Circuits and Systems
ISSN (Print)0271-4310

Conference

Conference2008 IEEE International Symposium on Circuits and Systems, ISCAS 2008
CountryUnited States
CitySeattle, WA
Period18/05/0821/05/08

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