[SI-LIST] Re: TDR S-parameter and correlation

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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
fax     510-742-6686
www.ghzdata.com




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