Reply To: Ansys Electronics Desktop – Circuits – Convolution for transient simulation

[Dan Dv]

OK, 450 ports is a lot. In order to run this in state-space, which is typically much faster that convolutoin, you may just need a maching with more memory to get that fit done. 

It may not help with the memory usage, but I'm not sure I like that frequency sweep. I usually recommend doing two separate sweeps. Frist a linear sweep betwen 0Hz and your top frequency (in this case 50MHz) in 10MHz steps. And then a log sweep from 1Hz to 10MHz with 10 points per decade. 

Again, I'm not sure it well help with memory, but your original sweep has a couple of issues. The big one is the 500MHz steps at high frequency. That kind of extreme undersampling almost always makes the s-parameters numberically non-causal. And that can cause all kinds of downstream problems.