HI,
just two small comments:
- Just because one has an S-Parameter package model does not mean one
has a good and accurate package model.
- It always depends on the size of a structure vs. the risetimes to
judge which model bandwidth is required ..
just my two cents .. (or was it just one ????)
Hermann
EKH - EyeKnowHow
Signal Quality - Made in Bavaria
Hermann Ruckerbauer
www.EyeKnowHow.de
Hermann.Ruckerbauer@xxxxxxxxxxxxx
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Am 30.05.2016 um 18:45 schrieb Shiva Jilla:
Pratap,
RLC Values in the IBIS are lumped values and the S Parameter data is
distributed parameters.
Lumped Values are only for the What if Analysis..
S parameters data is more realistic and will be helpful in the Sign off
Simulations.
Best Regards,
Shiva
On Mon, May 30, 2016 at 10:11 PM, Pratap Simha <pratapasimha@xxxxxxxxx>
wrote:
Thanks Shiva.
You are right, I have a output buffer followed by a package model.
Upto what frequency (1GHz?)can we rely on RLC values in the ibis in case I
don't have a package model.
Thanks
Pratap
On Monday, May 30, 2016, Shiva Jilla <jillashiva@xxxxxxxxx> wrote:
Hi Pratap,
You can Simply edit the IBIS file under the [package] Keyword , there
will be 3 things defined
1. R_pkg
2. L_pkg
3. C_pkg
Just make all the 3 values as "0" in all the Corners Typ/Min/Max.
I Assume you have a O/p IBIS model followed with a Package S Parameters
Connected.
Hope this helps.
Cheers,
Shiva
On Mon, May 30, 2016 at 7:58 PM, Pratap Simha <pratapasimha@xxxxxxxxx>
wrote:
Hi All,
When we use IBIS output buffer model along with a say HFSS extracted
package model (typically a touchstone format s parameter file) how can we
make sure the IBIS RLC package parasitic numbers are disabled and only
the
s parameter package model file is used ? (In tools like ADS)
(Because we anyway have a accurate package model extracted and so we
don't
want to have duplicated package models, one in ibis RLC package
parasitics
, the othe as s parameter package model)
Thanks
Pratap
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Regards,
Jilla Shiva Prasad
