EMRFD Message Archive 2316

Message	Date	From	Subject
2316	2008-10-25 08:52:10	rotfunkblau	IP3 Simulation with Spice
Hello, trying to do IP3 simulation with Spice (SwitcherCad III) I did not get any useful results. Does anyone has practical experience. At least from theory this should be possible. f1=7100khz F2=7000khz Simulation time 6ms, 10ms, 20ms, maximum time step 10ns, 20ns,50ns I see digital noise and strange frequencies poping up when doing the FFT on the output. With increasing the simulation time these disturbing frequencies are getting lower. But others pop up. Seems that calculation errors sum up. This is independend from the FFT size and FFT window type. Seems I get not enough "digital calcutation dynamics". But maybe there is a trick or some rule which I don't know. In the worst case Spice is not able to provide the needed accuracy. 73 de Guenter dl5sdc
2317	2008-10-25 10:18:02	Gary Johnson	Re: IP3 Simulation with Spice
Guenter, There is a Yahoo group for LTSpice, and is definitely worth joining. Searching for IIP3, I found a recent post by DL4SDC (how about that coincidence
2318	2008-10-25 11:11:25	rotfunkblau	Re: IP3 Simulation with Spice
Hello Gary, thanks for your answer, since I am not aware of this group I am wondering how my call sign is used in this group ?! 73 de Guenter dl5sdc
2319	2008-10-25 11:11:28	rotfunkblau	Re: IP3 Simulation with Spice
Correction: it is not my call, it is only very similar, but I don't know that guy. 73 de Guenter dl5(!)sdc