Sreekanth,
From your description, I would guess that the ports you set up at the SFP end
of your diff channel do not DC- connect to the traces (or the connector
fingers). I.e., it's an Open at that end. Visualize your mesh, verify the
port's mesh connects to that of the conductors, fix the problem, run solver
again at just one freq point - say 1GHz - to confirm that your fix worked: S11
should be different from zero.
Regards,
Vadim Heyfitch
Sent from my phone
On Dec 29, 2015, at 22:04, Aramareddy Sreekanth reddy <aramareddy.s@xxxxxxx>
wrote:
Hi Experts,
I am facing a problem, could you please help me
We have high speed pair of differential line, travelling in the inner layer
from FPGA BGA to SFP connector.
I was trying to simulate in frequency domain to get the channel characteristics
using the tool CST tool, we have cut the differential section of the traces
from the board and started simulating.
Here it is taking too much time for the simulation, its around two days for one
simulation and at the end simulation results were not matching i.e S11 is
almost 0dB.
Topology is given below:
BGA_TX_P----------->SFP_Connector_RX_P
BGA_TX_N----------->SFP_Connector_RX_N
When i am cutting only BGA portion of TX and simulating, the results were fine
i.e S11 is approximately 10dB
When i am taking the entire channel and simulating, S11 comes to be 0dB.
Could you please help me in finding the problem?
Thanks & Regards
Sreekanth
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