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Vol. 136, Issue 1, January 2012, pp. 1-11




A Novel Method of Linearizing Thermistor Characteristic Using Voltage Controlled Oscillator


1 Narayana K. V. L and 2 Bhujanga Rao A.

1 Department of Electronics and Instrumentation Engineering, GITAM Institute of Technology, GITAM University, Visakhapatnam- 530 045, India

2 Department of Instrument Technology, Andhra University, Visakhapatnam -530 003, India

E-mail: kvl007in@yahoo.co.in, dr_abrao@yahoo.co.in



Received: 17 November 2011 /Accepted: 13 January 2012 /Published: 30 January 2012


Digital Sensors and Sensor Sysstems


Abstract: This paper introduces a novel way of linearizing the thermistor characteristic using Voltage Controlled Oscillator (VCO) which exhibits a linear analog temperature/frequency relation over a wide temperature range (0 0C to 120 0C) with reasonably good response linearity, reliability, and overall improved performance. Linearization is required to compensate for the inverse exponential nature of the resistance-temperature characteristic of the thermistor. A notable feature of the proposed circuit is the sensitivity in the thermistor is quite high. The efficacy of the proposed circuit is established through simulation studies and its practicality demonstrated with experimental results obtained on a prototype unit built and tested. The proposed circuit is characterized by nonlinearity of 1 % and sensitivity of about 5 kHz/oC in the temperature range of 0 0C to 120 0C, as well as high temperature stability.


Keywords: Thermistors, 566 Voltage controlled oscillator (VCO), LabVIEW, Temperature measurement, Linearization, Sensors


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