A Simple Linear Temperature-to-Frequency Converter Using a Thermistor

Osama I.MOHAMED  Toshifumi TAKAOKA  Kenzo WATANABE  

IEICE TRANSACTIONS (1976-1990)   Vol.E70   No.8   pp.775-778
Publication Date: 1987/08/25
Online ISSN: 
Print ISSN: 0000-0000
Type of Manuscript: PAPER
Category: Instrumentation and Control

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A novel temperature-to-frequency converter consisting of the thermistor-controlled current source, comparator, and monostable multivibrator is developed. Linearization is made by comparing the voltage developed across the current source with an exponentially growing voltage. A prototype converter built using standard components shows an excellent linearity with the residual error less than 0.2% over the range from 273 K to 353 K. The converter features the simple configuration, high accuracy, and single supply operation.