[SI-LIST] TL paramters conversion from EBD to ADS

From: Arrigo Benedetti <arrigo@xxxxxxxxxxxxxxxxxx>
To: si-list@xxxxxxxxxxxxx
Date: Wed, 27 Aug 2008 12:26:20 -0700

Dear list,

I am trying to convert transmission line parameters from an IBIS EBD 
file describing a memory
module to the format used by ADS. I could not find a distributed RLC 
model in ADS so I
am planning to use the TLIN (Ideal 2-Terminal Transmission Line) 
component. The parameter
of this compoment are

Characteristic impedance Z
Electrical length E
Reference frequency for electrical length (F)

Now, the electrical length is defined as beta*l where beta is the 
imaginary part
of the propagation constant and is given by the expression

beta=sqrt(1/2*(sqrt(omega^4(LC)^2 + omega^2*(RC)^2)+omega^2*(LC)^2))

where R,L,C are from the EBD file. The line is lossy, so the 
characteristic impedance is complex,
however ADS accepts just one value for Z. Is this the magnitude? The 
documentation does not
say that... Also: can I set the reference frequency to any value and 
just plug this value into the expression
for beta?


Thanks
-Arrigo

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[SI-LIST] TL paramters conversion from EBD to ADS

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