RFICDUDE wrote on Jul 26th, 2012, 5:29pm:Yes, I run transient analysis and obtain the amplitude and phase from a DFT.
I am confused why you are having trouble with memory using transient simulation unless you are saving all nodes and currents in the circuit. If you are running many parametric sweeps then consider saving only the nodes of interest in the circuit.
Other simulation methods consume even more memory to find the steady-state solution you are interested in finding.
Thanks for your suggestion! It's a good idea to save only the nodes of interest.
But I have another question on computing the amplitude and phase from the DFT.
I tried to use the "harmonic" function provided by the calculator in spectre to get the level of the fundamental frequency from DFT, but it does not work. And there is the warning that "harmonic" function can not handle "scaler " data from DFT. So which function in the calculator do you use to compute the amplitude and phase? Or you mark the fundamental frequency by yourself?
Thank you again!
Yutao Liu