Calibration Techniques for Temperature Sensors

A method comprising:

• in a first stage, acquiring operating frequencies for a first set of ring oscillators disposed in a first integrated circuit, wherein the operating frequencies are acquired at pre-determined temperatures with a constant voltage;
• in the first stage, determining one or more first coefficients and a first constant for each ring oscillator in the first set, wherein the one or more first coefficients and the first constant define a relationship between each operating temperature and each operating frequency using the acquired operating frequencies;
• in the first stage, determining a correlation between each of the first coefficients and the first constant;
• in a second stage, acquiring a single operating frequency for each of a second set of ring oscillators in a second integrated circuit at a single pre-determined temperature so as to determine a second constant;
• in the second stage, predicting one or more second coefficients for each ring oscillator in the second set based on the second constant and the correlation;
• and
• in the second stage, deriving a temperature dependence based on the single operating frequency using the one or more second coefficients and the second constant for each of the second set of ring oscillators.