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.