[SI-LIST] Re: About Tco

Hi Terence,

Internal delay of IBIS buffer delay is involved in the V/T data, when
using spice2ibis utility to generate IBIS buffer model, you may find
this situation. As I know, IBIS buffer in HSPICE contains the internal
delay, about the cause of 100~300ps difference, I think it is yielded
by input stimulus rise time Trise. The buffer delay in HSPICE will be
a constant which is showed in V/T data, and not change according to
Trise, however, the actual responding including the buffer delay is a
function of Trise ( may have other factors ). I guess that buffer delay
in spectraquest is cut off from V/T data.
Hope this can help you.

best regards

slwu

TerenceHsieh@xxxxxxxxxxxx wrote:

> Dear all
>         Is any one know that if the V/T waveform in ibis include
> buffer delay? I have compared the output waveforms of (1)spice
> file, (2)ibis in spice and (3)ibis in borad simulation tool(specctraquest).
> There are some difference in delay (between (1)(2) about 100~300ps;
> between (1)(3) the delay difference will > 1ns ). Is this condition normal?
> How could I generate more accurate waveform?
> Terence
>
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