A Programmable Temperature Switch

Master thesis (2019)

Authors

S.S. Rautmare Electrical Engineering, Mathematics and Computer Science

Contributors

K.A.A. Makinwa Microelectronics (mentor)

Robert van Veldhoven NXP Semiconductors (graduation committee member)

Faculty

Electrical Engineering, Mathematics and Computer Science, Electrical Engineering, Mathematics and Computer Science

Offset Trimming BJT Temperature Switch Programmable

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Published Date

27-11-2019

Language

English

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Faculty

Electrical Engineering, Mathematics and Computer Science

Abstract

Temperature threshold sensors facilitate temperature protection in microprocessors by indicating when the processor gets overheated or too cold. This thesis presents a BJT based temperature sensor with a programmable temperature threshold from -40°C to 150°C. Comparison of a CTAT voltage with a PTAT voltage gives a one-bit digital output when the temperature of the die exceeds the set threshold. This work achieves a temperature detection accuracy of ±0.75°C, leading to the lowest reported relative inaccuracy among temperature switches by using a room temperature digital trim and without the use of any dynamic techniques. The design has a current consumption of 7uA, and the estimated area of the system is less than 0.05mm2 in 0.16µm CMOS technology.

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