Abstract
Recently, Kumar et al. [1] have reported an Artificial Neural Network (ANN) based linearization technique for Voltage Controlled Oscillator (VCO) thermistor circuit. In this work ANN was used to linearize the frequency output of VCO, driven by the voltage across thermistor, for an input temperature range of 0 °C–100 °C. Performance of the developed technique was claimed to be experimentally verified for sensitivity and linearity of 5 kHz/°C and ±0.2%, respectively, for all the investigated three different thermistors (M/S Phillips make). In this comment, using the data provided in [1] and based on the relevant theoretical analysis it is shown the obtainable theoretical sensitivities are 136.918 Hz/°C, 108.919 Hz/°C and 267.938 Hz/°C for the used thermistor-1, thermistor-2 and thermistor-3, respectively, instead of the claimed 5 kHz/°C.
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