A time-to-digital-converter-based CMOS smart temperature sensor

Chun Chi Chen, Wen Fu Lu, Chin Chung Tsai, Poki Chen*

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review

10 Citations (Scopus)


A time-to-digital-converter-based CMOS smart temperature sensor is proposed for high-accuracy portable applications. Conventional smart temperature sensors rely on analog-to-digital converter, which consumes much chip area and operation power, for digital output code conversion. For the purpose of cost reduction and power saving, the proposed smart temperature sensor first generates a pulse with a width proportional to the measured temperature. Then, a cyclic time-to-digital converter (TDC) is utilized to convert the pulse into the corresponding digital code. The test chips with extremely small area of 0.175mm2 were fabricated by TSMC CMOS 0.35um 2P4M process. Due to the excellent linearity of the digital output, the achieved measurement error is merely -0.6̃+0.8°C without any curvature correction or dynamic offset-cancellation. The effective resolution is better than 0.15°C, and the power consumption is 10μW.

Original languageEnglish
Article number1464649
Pages (from-to)560-563
Number of pages4
JournalProceedings - IEEE International Symposium on Circuits and Systems
Publication statusPublished - 2005
Externally publishedYes
EventIEEE International Symposium on Circuits and Systems 2005, ISCAS 2005 - Kobe, Japan
Duration: 2005 May 232005 May 26

ASJC Scopus subject areas

  • Electrical and Electronic Engineering


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