Re: Rising/Falling waveform and Ramp keywords

"Peters, Stephen" wrote:
> Note that for a standard CMOS buffer the cookbook recomends including four
> waveforms: two rising, one with the buffer driving 50 ohms to VCC and
> another with the buffer driving 50 ohms to gnd, and two falling, same
> conditions. For more info, check out the IBIS cookbook at
>

Stephen,

I am a little uncomfortable with specifying a waveform into a 50 ohm
load, when we tell our customers to use a 60 ohm characteristic
impedance on their board. Would it screw the IBIS modeller up if we gave
a waveform into a 60 ohm load? I would think it would be more
representative (if not more accurate) of what the driver would see in
normal use.

Alan Hilton-Nickel
Transmeta Corp
 
Received on Fri Dec 15 11:23:30 2000