NDLI: Widlar-Widlar voltage-reading temperature sensor

Content Provider	IEEE Xplore Digital Library
Author	Bogdan, M.V.
Copyright Year	2011
Description	Author affiliation: Faculty of Electronics and Telecommunications, "Politehnica" University of Timi§oara, Bd. Vasile Parvan, nr. 2, Timi§oara, Romania (Bogdan, M.V.)
Abstract	The paper presents the design of a CMOS integrated circuit whose output voltage varies linearly with temperature. This sensor is implemented using two classical cross-connected current mirrors. The voltage value is read on the resistor of the lower Widlar mirror. We examined how the output voltage varies with temperature considering the open-output circuit. The sensor's design is made using resistors with negative, null or positive temperature-coefficient values. Circuit performance shall be emphasized when NTC and PTC resistor pairs are used. The maximum slope was computed for the output voltage and the maximum slope condition was estimated too. The circuit was sized to fit a maximum slope, thus resulting in a 6.27% error between the analytical and the simulated slope. The sensor's performance parameters are: the optimized output voltage slope (3.2813mV/°C), the optimized percentage slope (0.1946%/°C), low current consumption (30μA measured at 20°C), VDDmin of 2.8V, and supply regulation of 4289ppm/V at 3.5V. The sensor occupied-on-chip area is also small: $3075μm^{2}.$ The total percentage variation of the output voltage slope with the manufacturing process is 25.4%, while the total variation of the output voltage with the manufacturing process amounts to 31.1%
Starting Page	288
Ending Page	293
File Size	2127366
Page Count	6
File Format	PDF
ISBN	9781457714108
e-ISBN	9781457714115
DOI	10.1109/TSP.2011.6043724
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2011-08-18
Publisher Place	Hungary
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Temperature sensors Resistors Resistance CMOS temperature sensor Manufacturing processes Voltage-reading temperature sensor ZTC resistors Use of NTC Mirrors Transistors Voltage control PTC
Content Type	Text
Resource Type	Article

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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