Subject: RE: Vth BIRD 6.etc

From: [email-masked] (Syed Huq)
Date: Wed, 2 Feb 94 11:24:23 PST

Hi jon,
	I hope this explanation helps. For a diff. rcvr, the Vth and Vtl or
	VT+ and VT- are levels swinging above and below 0 volts differential
	and not 0 volts ground. 

	Here is an example. Let's say Receiver inputs are VIH=+1.5V and VIL=+1.3V
	For the First cycle VT+ = 1.5-1.3 = +0.2 volts. On the next cycle,
	VT- = 1.3-1.5 = -0.2V. That's how you get a +/- number. Note that the
	VIH and VIL were always +ve voltages.

	Ideally the Vth and Vtl are symetrical.

Regards,
Syed Huq

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