[SI-LIST] Re: trouble simulating with AC coupling capacitors in topology
- From: prathap sirishe <prathapsirishe@xxxxxxxxx>
- To: Andy Haas <andyhaas@xxxxxxxxxxx>
- Date: Fri, 8 Jul 2011 13:49:28 -0400
Hello Roopesh,
I remember facing same issue before. From what I recollect, apart from all
the solutions mentioned so far, you can try to generate a
s-parameter model for an ac coupled differential trace pair using another
simulation tool like Hyperlynx and use the resultant ".s4p" file in
Cadence tool set, replacing differential trace segment with 4-port
s-parameter model.
Hope this helps!
Regards,
Prathap
On Fri, Jul 8, 2011 at 11:31 AM, Andy Haas <andyhaas@xxxxxxxxxxx> wrote:
> Hi guys,
>
> There should be no issue in simulating nets with series caps within the
> Cadence SI environment. Initial conditions can also be used if you use the
> right model. Feel free to contact me offline and I'd be happy to help.
>
> Regards,
> Andy
>
> -----Original Message-----
> From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
> On Behalf Of Newbie Pugal
> Sent: Friday, July 08, 2011 9:50 AM
> To: Roopesh Badala; si-list@xxxxxxxxxxxxx
> Subject: [SI-LIST] Re: trouble simulating with AC coupling capacitors in
> topology
>
> Hi Roopesh,
> I have faced similar problem in the past and went to cadence for the
> support but did not worked out. With the AC caps in the cadence the P
> and N waveforms will not come as expect. Later I simulated using HSPICE
> with initial condition settings or else you need to run a long bits for
> the settled waveforms.
>
> Regards
> Pugal
>
>
> ________________________________
> From: Roopesh Badala <roopesh.badala@xxxxxxxxx>
> To: "si-list@xxxxxxxxxxxxx" <si-list@xxxxxxxxxxxxx>
> Sent: Friday, 8 July 2011 4:54 PM
> Subject: [SI-LIST] trouble simulating with AC coupling capacitors in
> topology
>
> Hi All,
> I am trying to simulate a topology which has AC coupling capacitors in it.
>
> Using Cadence Allegro PCB SI tool set , i am unable to get the expected
> output.
>
> but when I simulate the same topology by removing the AC coupling
> capacitors
> in signal path, I get a perfect waveform.
>
> Is this a tool limitation..? can some body suggest me if they have faced
> similar issue.
>
>
> Thank you
>
> Roopesh
>
>
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