A temperature sensor with an inaccuracy of -1/+0.8 °C using 90-nm 1-V CMOS for online thermal monitoring of VLSI circuits

Masahiro Sasaki, Makoto Ikeda, Kunihiro Asada

Research output: Contribution to journalArticle

66 Citations (Scopus)

Abstract

This paper proposes an accurate four-transistor temperature sensor designed, and developed, for thermal testing and monitoring circuits in deep submicron technologies. A previous three-transistor temperature sensor, which utilizes the temperature characteristic of the threshold voltage, shows highly linear characteristics at a power supply voltage of 1.8 V or more; however, the supply voltage is reduced to 1 V in a 90-nm CMOS process. Since the temperature coefficient of the operating point's current at a 1-V supply voltage is steeper than the coefficient at a 1.8-V supply voltage, the operating point's current at high temperature becomes quite small and the output voltage goes into the subthreshold region or the cutoff region. Therefore, the operating condition of the conventional temperature sensor cannot be satisfied at 1-V supply and this causes degradation of linearity. To improve linearity at a 1-V supply voltage, one transistor is added to the conventional sensor. This additional transistor, which works in the saturation region, changes the temperature coefficient gradient of the operating point's current and moves the operating points at each temperature to appropriate positions within the targeted temperature range.

Original languageEnglish
Article number4512063
Pages (from-to)201-207
Number of pages7
JournalIEEE Transactions on Semiconductor Manufacturing
Volume21
Issue number2
DOIs
Publication statusPublished - 2008 May 1
Externally publishedYes

Keywords

  • CMOS
  • Temperature coefficient
  • Temperature sensor
  • Thermal diode
  • Thermal monitoring
  • Two-point calibration

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Industrial and Manufacturing Engineering
  • Electrical and Electronic Engineering

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