Method to calibrate a temperature sensitive ring oscillator with minimal test time

The present invention provides for calibrating a TSRO with two tests, wherein generating a first or second calibration value does not substantially alter the temperature performed within the first or second test. The first calibration value is generated during a first test at a first temperature. The first test can be a wafer test, a module test, a burn-in test, and so on. The first calibration value is stored with an e-fuse in the integrated circuit. A second calibration value is generated during a second integrated circuit test of the integrated circuit at a second temperature. The second test can be a test that is performed at a temperature other than the first test. The second calibration value is stored with an e-fuse in the integrated circuit.