FreeLists / si-list / [SI-LIST] true differential IBIS problem

[<TerenceHsieh@xxxxxxxxxxxx>]

Dear All
I have generated a truly differential IBIS .But there are some problem.

When I generate the IBIS's rising/falling waveform, I use 50 ohm

for R_fix and common mode voltage for V_fix. In the sig-xp, if I use

the IBIS to drive a 50 ohm resistor terminated to common mode voltage,
the 

waveform is exactly right .But I must use the IBIS to drive a
transmission

line without termination. When I use the IBIS to drive a pure
transmission

line the output waveform's DC level will change and common mode voltage
of 

D+ and D- is different too .How could I generate a truly differential
IBIS 

for pure transmission line network without termination?

 

B.R.


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