Hi
You can try to build your own cable model in Designer, there is a built in
model library for coax in the tool, and try to match the vendor's S param
model...
Once it fits, you can use it for your sim... from D.C. To 5GHz
All you have to do is matching attenuation dB/m, impedance and delay...
Eventually you can also try the physical model of coax cable, with
conductors diameter and dielectric properties Dk and Df
Regards
Cris
On Sat, Jun 24, 2017 at 3:33 AM chetan reddy <chetanreddy179@xxxxxxxxx>
wrote:
Hi All,
I am trying to run a transient simulation for checking the signal quality
on one of the low speed interface, which runs at 100 Khz (Square wave). The
topology is shown below:
(TX ibis)---> (board trace S parameter model)--->(Cable S parameter
model)--->(board trace S parameter model)--->(RX ibis).
The Vendor has provided the S parameter model for the cable, but they have
extracted it from 300Khz to 5Ghz but my square wave signal operating
frequency is 100Khz. When i have asked them to extract from DC to 5Ghz,
they replied like that their VNA is not capable to extract from DC (0Hz),
minimum it works from 300Khz to 25Ghz.
Signal logic is 3.3V. I have used the same cable S parameter into my
transient SI simulation. At the output side i could see only a Square wave
with ampliture 1.2V. This is because the fundamental component is being
filtered by the channel.
In this case, how should i get a cable model which is from 100Khz to 5Ghz
or DC to 5Ghz?
Can we do extrapolation to generate the model from DC to 5Ghz?
I have tried to extrapolate in Ansys Designer, but i could not see any
improvement in the output.
Please kindly suggest what needs to be done?
Regards
Chetan.
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