[SI-LIST] Re: Temperature variable in SI simulation

IBIS models do account for temperature, sort of.  But they are useless
for telling you how results vary versus temperature, or even to run a
simulation at a particular temperature (other than the specified
"typical" temperature).

If the IBIS model is of a bipolar device (TTL, old ECL), the maximum VI
and VT curves correspond to maximum temperature.  If it is a CMOS
device, maximum VI and VT curves correspond to minimum temperature.  If
it is BiCMOS, or some sort of temperature compensated device, there's no
saying what they correspond to.  I don't believe the simulator has any
way of knowing, so I'd assume they are incapable of changing anything
about an IBIS model versus temperature.

Get your hands on SPICE models, if you can.  I think it's the only way
to model temperature variations.

Regards,
Andy


> I want to do SI simulation of my design at various temperatures.
> 
> The IBIS models of the devices specify temperature ranges as 0 to 100
> degree
> C and a typical value of 50 degree C.
> My knowledge is, the VI and VT curves of the devices are specified at
> 50
> degree C.
> 
> How can I specify board and device temperatures in Cadence Spectra
> Quest??
> 
> Even if there is a way, will the SI tool really scale the VI curves
> with
> specified temperature??
> 
> Regards,
> Chetan
> 
> 
> 

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