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Open AccessFeature PaperArticle

A 40 nW CMOS-Based Temperature Sensor with Calibration Free Inaccuracy within ±0.6 C

1
Department of Computer Science, Electrical and Space Engineering, Luleå University of Technology, 97187 Luleå, Sweden
2
Department of Electronics and Nanoengineering, Aalto University, 02010 Espoo, Finland
*
Author to whom correspondence should be addressed.
Electronics 2019, 8(11), 1275; https://doi.org/10.3390/electronics8111275
Received: 30 September 2019 / Revised: 21 October 2019 / Accepted: 29 October 2019 / Published: 1 November 2019
(This article belongs to the Section Microelectronics and Optoelectronics)
In this study, a temperature equivalent voltage signal was obtained by subtracting output voltages received from two individual temperature sensors. These sensors work in the subthreshold region and generate the output voltage signals that are proportional and complementary to the temperature. Over the temperature range of −40 C to +85 C without using any calibration method, absolute temperature inaccuracy less than ±0.6 C was attained from the measurement of five prototypes of the proposed temperature sensor. The implementation was done in a standard 0.18 μ m CMOS technology with a total area of 0.0018 mm 2. The total power consumption is 40 nW for a supply voltage of 1.2 V measured at room temperature.
Keywords: PTAT; CTAT; temperature sensor; CMOS; ultra low power; calibration free PTAT; CTAT; temperature sensor; CMOS; ultra low power; calibration free
MDPI and ACS Style

Chouhan, S.S.; Halonen, K. A 40 nW CMOS-Based Temperature Sensor with Calibration Free Inaccuracy within ±0.6 C. Electronics 2019, 8, 1275.

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