IL mismatch parameters estimator tracks IL mismatch variations across temperature and gives good performance under normal conditions. However if IL mismatch estimation is frozen, the residual IL mismatch seen would vary with temperature as shown in Figure 9-13. To reduce the residual IL mismatch below this level, customer may put the system in calibration mode whenever significant temperature change is detected or based on a certain time lapse from the last calibration.

Figure 9-13 Residual IL Spur for signal at 400 Mhz vs Temperature after freezing IL calibration at 25°C