jbdavid wrote on Dec 18th, 2008, 8:06pm:Those complex values are either Small signal quantities or Base-band equivalent values..
these are useful in RF systems analysis,
No, you are misunderstanding.
I don't mention equivalent lowpass model which is called as baseband model in Cadence where only complex envelope I(t)+j*Q(t) are concerned.
And both Ptolemy and Simulink are time domain simulator in signal flow model(not energy conservative system), although they can treat s-parameter box as complex coefficient FIR model.
I'm mentioning about Analog RF simulation of wireless or high speed wired application in full transistor level circuits.
Also a start of this thread is regarding small signal analyses such as AC, XF, SP and NOISE.
jbdavid wrote on Dec 18th, 2008, 8:06pm:Of course this has been a request for years and years.. and probably NOT something solved in a spice-type simulator any time soon.
At least, a convolution of Agilent ADSsim is superior than Cadence Spectre as a spice-type simulator.
And feature of convolution of Agilent ADSsim is that it is not restricted to NPORT.
Cadence has insisted on rational fitting(linear macro model fitting) about s-parameter in transient analysis
and denied convolution for long long time.
But recently, Cadence recommend user to use convolution and don't recommend rational fitting.
Rather Cadence is denying rational fitting now.
http://www.designers-guide.org/Forum/YaBB.pl?num=1174585355/1#1