[SI-LIST] Re: trouble simulating with AC coupling capacitors in topology

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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