If you selected a dual PLL, you will see this additional field. You can select the RF side and AUX side to analyze. Simulations Select the simulation you want to perform by clicking Go . Spur Estimate Select this simulation to obtain the spur gain and level. Spur Estimate For these estimates, the assumption is that dominant effects - Leakage and Pulse Effects, cause the spur.
Leakage refers to the charge pump leakage in the tri-state mode and is specified in the datasheet.
Pulse effects refer to all other effects including charge pump mismatches, unequal transistor turn on times, and imperfections in fractional calibration circuitry in the case of a fractional spur. However, the worst-case spur over tuning range is what this program is trying to predict. The numbers shown below are based on theoretical concepts as well as data that was actually be extrapolated from PLLs. This information is part specific. You should be very aware that spur levels are very difficult to predict in an absolute manner.