A 5800 μm2 Resistor-based Temperature Sensor with a One-Point Trimmed Inaccuracy of ±1.2 °C (3σ) from −50 to 105 °C in 65 nm CMOS

Yongtae Lee, Woojun Choi, Taewoong Kim, Seungwoo Song, Kofi Makinwa, Youngcheol Chae

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Abstract

This letter describes a compact resistor-based temperature sensor intended for the thermal monitoring of microprocessors and DRAMs. It consists of an RC poly phase filter (PPF) that is read out by a frequency-locked loop (FLL) based on a dual zero-crossing (ZC) detection scheme. The sensor, fabricated in 65-nm CMOS, occupies 5800 μm 2 and achieves moderate accuracy [±1.2 °C (3σ)] over a wide temperature range (-50 °C to 105 °C) after a one-point trim. This is 2x better than the previous compact resistor-based sensors. Operating from 0.85 to 1.3-V supplies, it consumes 32.5-μA and achieves 2.8-mK resolution in a 1-ms conversion time, which corresponds to a resolution FoM of 0.26 pJ·K 2 .
Original languageEnglish
Pages (from-to)67 - 70
Number of pages4
JournalIEEE Journal of Solid State Circuits
Volume2
Issue number9
DOIs
Publication statusPublished - 2019

Keywords

  • CMOS temperature sensor
  • r, dual zero-crossing (ZC) detection
  • frequency-locked loop (FLL)
  • one-point trim
  • RC poly phase filter (PPF)
  • resistor-based temperature sensor

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