Hi John,
It seems your approach is not a standard de-embedding technique. You should
try, TRL, AFR, or Port Extensions. Your decision should be made on your
calibration structures available. Documentation is widely available online
for these techniques and can be found using your favorite search engine.
Cheers,
Jason
Employed by and affiliated with The Siemon Company (http://www.siemon.com/)
On Mon, May 23, 2016 at 12:00 AM, John Lin <johnlinc@xxxxxxxxx> wrote:
Dear all SI gurus,
While doing de-embedding by removing 5 inch trace as fixture from 16
inch trace,
I find there are many spikes on my de-embedded S21 plot.
Here are my approaches.
1. Transfer both 5 inch and 16 inch S2P file to T paramter (matrix)
2. cut the 5inch into half by T_2p5inch *T_2p5inch = T_5inch ==>
T_2p5inch=T_5inch^ 0.5; assuming symmetry.
3. do inverse(T_2p5inch)
4. De-embedded result = inv(T_2p5inch)*T_16inch*inv(T_2p5inch)
5. Convert De-embedded T parameters back to S parameters.
I also use Delta-L for de-embedding. Both S21 plot can match well,
except the spikes.
I don't know what happen for the spikes and seek any idea from you.
Thanks,
John Lin
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