Re: [SI-LIST] : IBIS or SPICE examples

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From: D. C. Sessions (dcs@lumbercartel.com)
Date: Sat May 12 2001 - 06:59:47 PDT


On Thursday 10 May 2001 12:59, Degerstrom, Michael J. wrote:

> Another example is LVDS. I'm not aware of any standard
> dictating this but I think the source impedance of most
> LVDS drivers is much greater than 50 ohms. Sure one can
> implement a LVDS that provides an impedance closer to 50 ohms
> but that design would be very sensitive to power supply noise and
> perhaps to process variations as well.

IEEE 1596.3 -- output impedance must be in the 40-140 ohm range,
but like CML most implementations switch currents into a resistor.

-- 
| I'm old enough that I don't have to pretend to be grown up.|
+----------- D. C. Sessions <dcs@lumbercartel.com> ----------+

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