how does sp work?

[fredo]

hi, does anyone know how the s-parameter simulation (sp) works? i want to
get the s-parameter at various time instants. thanks

 

[Andrew Beckett]

On Wed, 20 Jun 2007 14:38:28 +0800, "fredo" <fredo@hotmail.com> wrote:

hi, does anyone know how the s-parameter simulation (sp) works? i want to
get the s-parameter at various time instants. thanks

Not sure what you're after when you're asking how it works.

You can get sp to run at particular times during a transient, by using the
actimes/acnames parameters of tran (on the tran options form).

Fill in the sp analysis form as usual in ADE (select your ports, specify the
frequency range).

Then on the transient, set your stop time, and then on the options form, specify
the times you want the sp to run at in the actimes field (space separated). Then
the acnames field will become ungreyed out, and you can type in "sp" in that
field.

If you're trying to look at sp for a linear periodic time variant system (i.e. a
circuit that translates in frequency), you may want to do SpectreRF's psp
analysis instead?

Regards,

Andrew.
--
Andrew Beckett
Senior Solution Architect
Cadence Design Systems, UK.

 

[fredo]

"Andrew Beckett" <andrewb@DcEaLdEeTnEcTe.HcIoSm> wrote in message
news:vjo5835ua09gjngtjfo59n9bc0tao169il@4ax.com...

On Wed, 20 Jun 2007 14:38:28 +0800, "fredo" <fredo@hotmail.com> wrote:

hi, does anyone know how the s-parameter simulation (sp) works? i want to
get the s-parameter at various time instants. thanks


Not sure what you're after when you're asking how it works.

You can get sp to run at particular times during a transient, by using the
actimes/acnames parameters of tran (on the tran options form).

Fill in the sp analysis form as usual in ADE (select your ports, specify
the
frequency range).

Then on the transient, set your stop time, and then on the options form,
specify
the times you want the sp to run at in the actimes field (space
separated). Then
the acnames field will become ungreyed out, and you can type in "sp" in
that
field.

If you're trying to look at sp for a linear periodic time variant system
(i.e. a
circuit that translates in frequency), you may want to do SpectreRF's psp
analysis instead?

Regards,

Andrew.
--
Andrew Beckett
Senior Solution Architect
Cadence Design Systems, UK.

Thanks for the suggestion but there is no actimes/acnames under the option
form of tran in my ADE. Originally, I wanted to find the s-parameter of my
circuit under the turned on situation, the turned off situation and while
switching. Or in other words, I tried to check if the s-parameter obtained
from sp is in the steady state or just the initial condition or after
convergence... the circuit is not necessarily linear so I don't think psp
might be applicable here. Therefore, I wondered whether sp could be made
dependent to my tran simulation so that I could define it after steady
state.

And by the way, will it be accurate for pss to do the similar thing as tran,
say if pss converges and tran reaches steady state? Will their mere
difference be a time domain and frequency domain stuff? I mean in terms of
voltage, current and power.

Just another question, does every node in tran simulation obey the KVL and
KCL rule? Because I found weirdly that sometimes they don't. And I just
treat them as a weird feature in here.

So a lot of thanks and cheers.