Abstract: Various systems, methods, and programs embodied in a computer readable medium are provided for determining a worst-case impedance and worst-case voltage of a power supply loop coupled to a power input of a die. In various embodiments, the worst-case impedance of a power supply loop is determined and a reference voltage at the power input of the die associated with an average current generated at a power supply included in the power supply loop. A maximum change in a current at the power input of the die is also measured and an estimate of a worst-case voltage at the power input of the die is calculated based upon the worst-case impedance, the reference voltage, and the maximum change in the current.

Abstract: A method comprises exciting a system with an input having predetermined maximum and minimum input values, selecting time points t1 and tj in a system response having a plurality of maximum response values at time points ti and a plurality of minimum response values at time points tj. A maximum worst-case excitation input is generated. The maximum worst-case excitation input has a positive transition from the predetermined minimum input value to the predetermined maximum input value the at each time (T−t1), and a negative transition from the predetermined maximum input value to the predetermined minimum input value at each time (T−tj). The method further generates a minimum worst-case excitation input having a negative transition from the minimum input value to the maximum input value at each time (T−ti), and a positive transition from the maximum input value to the minimum input value at each time (T−tj).