[SI-LIST] Re: Basic IBIS I/V curve question
- From: <marko.pulli@xxxxxxxxx>
- To: <Andrew.Ingraham@xxxxxx>
- Date: Thu, 7 Nov 2002 17:01:21 +0200
Hi,
I was misled by one thing in my simulator.
You are absolutely right that the curves are independent of min/max =
voltage.
It looks like the simulator always uses the min and max from what is =
defined in the IBIS model [Voltage range] line.
I was trying to set the minimum and maximum voltage in the simulator =
environment but it doesn't seem to work.
Now I have changed the [Voltage range] section in the model itself to =
correspond the actual min and max in my design..
Thanks for guiding me back into the right path!
Br,
Marko
> -----Original Message-----
> From: ext Ingraham, Andrew [mailto:Andrew.Ingraham@xxxxxx]
> Sent: 07. November 2002 14:52
> To: si-list@xxxxxxxxxxxxx; Pulli Marko (NET/Espoo)
> Subject: [SI-LIST] Re: Basic IBIS I/V curve question
>=20
>=20
> Ideally, the three I-V curves would be independent of the operating
> supply voltage. The curves are Vcc-relative, so each of the three
> curves could be used with any supply voltage within the=20
> normal operating
> range.
>=20
> The minimum I-V curve is supposed to represent slow/weak=20
> silicon (due to
> IC processing variations) at whatever temperature results in slow/weak
> operation (high temp. for MOS, low temp. for bipolar). Since=20
> the supply
> voltage typically does influence device drive strength and speed, the
> minimum I-V curve is usually extracted when the supply voltage is also
> at minimum.
>=20
> I don't know how you can tell that the minimum I-V curve=20
> corresponds to
> any operating voltage. It shouldn't have any clues about the=20
> operating
> voltage.
>=20
> If you question whether the minimum I-V curve is valid, you should
> discuss this with the IC vendor or whoever made the IBIS=20
> model. Without
> that discussion, one should assume that the minimum I-V curve truly
> represents a worst-case device.
>=20
> Regards,
> Andy
>=20
>=20
>=20
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>=20
>=20
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