Re: EGG for Transmision Line Package Models

Hello Kumar:

     Thanks for your comments. You are correct -- what we are trying
to describe is a open ended circuit topology and by incorporating
a full (perhaps SPICE?) netlist description of the interconnection into
the .pkg file we would have a general solution. However, I am
unsure on one point. How do you describe coupling between transmission
lines using just a topological description of the circuit? Does the user have
to build a circuit where L's and C's are added between all the coupled nodes (and
does this really represent the coupling in the form the simulator tools need
and use) or are the matrixes still required? If they are required, how do
you indicate which circuit elements the matrix is trying to describe the coupling
between? Just some food for thought.....

         Regards,
         Stephen

>Kumar Writes:
>
>I have problem with this type of extension to IBIS format . Here we have open
>ended circuit information and we are trying to reinvent a circuit format.
>The best way to include open ended package information , in my view is in
>the form of a spice sub circuit. Once you have defined the external terminals
>and there is a mapping of these terminals to buffer output and device pins, the
>spice circuit allows you to put any number of transmission line sections,
>inductances , capacitances and or combination of lumped and transmission line
>elements. An extension to coupled transmission line sis RLGC matrixes with non
>zero length.
Received on Tue Apr 25 09:53:02 1995