[SI-LIST] Re: TDR S-parameter and correlation
- From: ronald miller <ron@xxxxxxxxxxx>
- To: zhenggang.cheng@xxxxxxxxx
- Date: Thu, 30 Aug 2007 13:22:20 -0700
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Hi Zhenggang
Apparently, you are working on S-Parameter data converted from TDR.
If you want to use S-Parameters as your model for simulation it is
reasonably accurate.
A much simpler method is avaiable using ADS.
Convert the TDR data to a time/amplitude columns vs Time
Import the data into ADS
Model the circuit using transmission line elements with Frequency
Dependent Loss
View the measured TDR and simulated TDR on the same screen
Adjust the parameters of the ADS models and simulate
Continue adjusting the parameters unti the model matches the
measrued TDR
This provides a model that cannot be faulted.
So then the eye pattern can be easily simulated with accurate models.
Ron
Once this is done
ZHENGGANG CHENG wrote:
>Hi,
>My question is:
>
>If we TDR (assuming the TDR method is 100% correct) the equivalent circuit
>converted using S-parameter, will the result is exactly the same as real TDR
>of the same DUT? (assume the converting error and bandwidth are not issues)
>Assume this DUT has many large discontinuities inside.
>
>To me, the real TDR can distinguish all the discontinuities inside a DUT;
>however, the S-parameter is only the characterization at the ports rather
>than inside. Will two equivalent circuits give the same S-parameter but have
>two different topologies?
>
>Look froward to your replies.
>
>Thanks,
>
>ZG
>
>
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--
Ronald Miller
Ghz Data, Signal Integrity Consulting
7721 Sunset Ave.
Newark CA 94560
tel 510-793-4744
cell 510-377-9380
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www.ghzdata.com
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