Andy I wrote, "If these are indeed the same elements with the same values in both figures, then it suggests that the "SDD" component represents only these parts of Figure 3: Cr, Rf, Cf, Vo, and the switch.? The switch might be key to making it model the step-recovery diode."
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Thanks. I also figured that out. But I was wondering how can I design the SDD component in LTSpice? Or should I design the equivalent circuit? I also need to incorporate the charge equation somehow.
