Dear Holz, I, personally, am not aware of a "default" value for the x-axis increment if the deriv() function as x-axis can represent time or some other variable and, if time in a transient analysis, it will depend on the simulator accuracy chosen and other designer specified simulator settings. There seem to be too many options to specify a default without impinging on its accuracy. The derivative process is already considered "noisy" for any numerical simulatior. One method to set the time steps to values of your choosing, such as 2ps or 20 ps in a transient analysis, is to set the strobeperiod and choose that ONLY the strobepoints be saved. In this fashion, the only data points that the function deriv() can use in its calculation are the strobepoints. This strobeperiod option and the choice to save only the strobepoints may be accessed through the "Outputs" tab of the Transient Analysis->Options GUI. I have included this tab as Figure 1 if it helps at all Holz. A second way might be to use the strobeperiod of 2 ps and then use the sample() function on your strobed waveform wits a sampling time of 20 ps. Use the sampled strobed data waveform as an argument to the deriv() to use a 20 ps x-increment or the unsampled strobe data as the 2 ps x-increment. Shawn Dear Holz, I, personally, am not aware of a "default" value for the x-axis increment if the deriv() function as x-axis can represent time or some other variable and, if time in a transient analysis, it will depend on the simulator accuracy chosen and other designer specified simulator settings. There seem to be too many options to specify a default without impinging on its accuracy. The derivative process is already considered "noisy" for any numerical simulatior. One method to set the time steps to values of your choosing, such as 2ps or 20 ps in a transient analysis, is to set the strobeperiod and choose that ONLY the strobepoints be saved. In this fashion, the only data points that the function deriv() can use in its calculation are the strobepoints. This strobeperiod option and the choice to save only the strobepoints may be accessed through the "Outputs" tab of the Transient Analysis->Options GUI. I have included this tab as Figure 1 if it helps at all Holz. Shawn Figure 1
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