5.4 A Hybrid Thermal-Diffusivity/Resistor-Based Temperature Sensor with a Self-Calibrated Inaccuracy of ±0.25° C(3 Σ) from -55°C to 125°C

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Abstract

Resistor-based temperature sensors can achieve higher resolution and energy-efficiency than traditional BJT-based sensors. To reach similar accuracy, however, they typically require 2-point (2-pt) calibration, compared to the low-cost 1-pt calibration required by BJT-based sensors. This paper presents a hybrid temperature sensor that uses an inherently accurate, but power-hungry, thermal-diffusivity (TD) sensor [1] to self-calibrate an inaccurate, but efficient, resistor-based sensor [2]. The use of an on-chip reference obviates the need for accurate temperature stabilized ovens or oil baths, drastically reducing calibration time and costs. Furthermore, by sharing most of the readout circuitry, the associated area overhead can be reduced. After self-calibration at room temperature (RT, \sim 25^{\circ}\mathrm{C}) and at an elevated temperature (\sim 85^{\circ}\mathrm{C}), the proposed hybrid temperature sensor achieves an inaccuracy of 0.25^{\circ}\mathrm{C} (3^{\sigma}) from -55^{\circ}\mathrm{C} to 125^{\circ}\mathrm{C}.

Original languageEnglish
Title of host publication2021 IEEE International Solid-State Circuits Conference, ISSCC 2021 - Digest of Technical Papers
PublisherInstitute of Electrical and Electronics Engineers (IEEE)
Pages78-80
Number of pages3
ISBN (Electronic)9781728195490
DOIs
Publication statusPublished - 2021
Event2021 IEEE International Solid-State Circuits Conference, ISSCC 2021 - San Francisco, United States
Duration: 13 Feb 202122 Feb 2021

Publication series

NameDigest of Technical Papers - IEEE International Solid-State Circuits Conference
Volume64
ISSN (Print)0193-6530

Conference

Conference2021 IEEE International Solid-State Circuits Conference, ISSCC 2021
CountryUnited States
CitySan Francisco
Period13/02/2122/02/21

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