Re: [SI-LIST] : Question on transmission line simulation by HP ADS /Momentum

About this list Date view Thread view Subject view Author view

From: Ozgur Misman (omism@amkor.com)
Date: Fri Apr 27 2001 - 14:41:49 PDT


Hi Nianci,

We faced a similar problem before. I would say that line cal is more
accurate then momentum for lossy characteristic impexdance. Momentum does
not model metal thickness. I think the upcoming version will. The
impedance you get using line cal is lossy characteristic impedance and that
matches very well with some state of the art 2-D field solver solutions. My
guess is you should be ok with momentum if lossles cjharacteristic
impedance sqrt (L/C) is what you are looking for. For lossy, I would go by
Line Cal.
Again, this is purely based on my personal experience and I haven't
verified it with measurement but used a 2-D solver for comparisons.

Best Regards,
Ozgur Misman
Amkor Technology, INC
Sr. Engineer

"Nianci Wang" <nwang@amcc.com>@silab.eng.sun.com on 04/27/2001 01:24:25 PM

Please respond to "Nianci Wang" <nwang@amcc.com>

Sent by: owner-si-list@silab.eng.sun.com

To: "'si-list@silab.eng.sun.com'" <si-list@silab.eng.sun.com>
cc:

Subject: [SI-LIST] : Question on transmission line simulation by HP ADS
      /Momentum

Hi,

I have a question on simulating finite metal thickness transmission line by
using HP ADS Line Calc and Momentum.

Basically I did simulation by using both line Calc and Momentum for several
different structures, I found that Momentum always give me a higher
characteristic impedance than that of Line Calc. The thicker the metal is,
the
larger the difference between two simulation results. I did talk with HP
ADS
help line and got the answer was that Momentum gave more accurate
simulation
results. I wonder if any one did the simulation by each line Calc or
Momentum
and compared the result with that of the measurement.

Thank you

Nianci

**** To unsubscribe from si-list or si-list-digest: send e-mail to
majordomo@silab.eng.sun.com. In the BODY of message put: UNSUBSCRIBE
si-list or UNSUBSCRIBE si-list-digest, for more help, put HELP.
si-list archives are accessible at http://www.qsl.net/wb6tpu
****

**** To unsubscribe from si-list or si-list-digest: send e-mail to
majordomo@silab.eng.sun.com. In the BODY of message put: UNSUBSCRIBE
si-list or UNSUBSCRIBE si-list-digest, for more help, put HELP.
si-list archives are accessible at http://www.qsl.net/wb6tpu
****


About this list Date view Thread view Subject view Author view

This archive was generated by hypermail 2b29 : Thu Jun 21 2001 - 10:11:45 PDT