Is there a more elegant and/or simpler method to model a repeating, damped sinusoid from SPICE or LTSpice rather than chaining the damped SINE sources in series? Below is a schematic and the waveform I am attempting to recreate ad infinitum.
I'm attempting to simulate switching noise from a DC/DC converter from within LTSpice. The area of interest is the PCB parasitics which cause a repeating, damped sinusoid superimposed on the switching frequency output ripple.
The only method I have found to model a repeating, damped sinusoid is to use a series chain of SINE sources, each offset in time by 1/2 the switching frequency, and include a damping factor for the decay. For a short chain length this is manageable; however for a longer transient sim, the thing would become unwieldy.
Any ideas how to make this repeatable forever?