It turned out (as expected) that the temperature-to- frequency relationship is almost linear for the temperature range tested (for a wider temperature range, especially below operating temperature and cryogenic range, the ring oscillators, as well as RC oscillators, have a strongly non- linear dependence [9]). For future calibration equations, linear regression coefficients for every individual sensor can be calculated. In any case, in future measurements, the calibration process should take into account the thermal properties of the device, as well as sensors locations.