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A highly sensitive thermosensing CMOS Circuit Based on self‐biasing circuit technique
Author(s) -
Hirose Tetsuya,
Hagiwara Atsushi,
Asai Tetsuya,
Amemiya Yoshihito
Publication year - 2009
Publication title -
ieej transactions on electrical and electronic engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.254
H-Index - 30
eISSN - 1931-4981
pISSN - 1931-4973
DOI - 10.1002/tee.20404
Subject(s) - biasing , subthreshold conduction , resistor , cmos , electronic circuit , electrical engineering , mosfet , electronic engineering , voltage , discrete circuit , circuit design , materials science , engineering , transistor
A thermosensing CMOS circuit that changes its internal voltage steeply at a critical temperature was developed. The circuit is based on a self‐biasing circuit technique and uses the temperature‐sensitive characteristics of MOSFETs operating in the subthreshold region. To develop this sensor device, a method to analyze self‐biasing circuits, which is different from a conventional one, was employed. This method is useful for understanding the self‐biasing circuit operation. A temperature sensor device makes use of a MOSFET resistor's transition from a strong inversion to a weak‐inversion or subthreshold operation. The temperature at which the transition occurs can be set to a desired value by adjusting the parameters of MOSFETs in the circuit. The sensor LSI can be made using a standard CMOS process and can be used as over‐temperature and over‐current protectors for LSI circuits. Copyright © 2009 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc.