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characteristic impedance of differential line

Question asked by echo on Nov 11, 2013
Latest reply on Nov 25, 2013 by rjrodrig@yahoo.com
I want to know the characteristic impedance of differential line by ADS2011. But this has something wrong. I hope someone can help me.thanks 

I set the parameter like the follow figures.

and I follow the example ( CPW_Diff_lines_Finite_Prj) of the ads2011. I tranfer the 8 ports into 4 ports, and then tranfer 4 ports into 2 ports, and then try to find the characteristic impedance by parameter sweep and optim  

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