Rambus (RMBS) - Eagle or Penguin Message Board

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Technology Stocks : Rambus (RMBS) - Eagle or Penguin

RMBS 103.99

-1.0%

10:20 AM EST

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To: jim kelley who wrote (51059)	8/24/2000 6:18:37 PM
From: Ali Chen	Read Replies (1) of 93625

<it appears that you are disputing his physics comments on the voltage swings and their effects on crosstalk. Are you?> Yes, I am. If you show me any quantitative statement from him with regard to the crosstalks:) To start with, and basing on (our) lovely Maxwell equations, the level of coupling depends on the rate of change in electrical quantity, and not on the absolute static level of signals (aka "voltage swings"). Second, the voltage swing of Rambus is 0.8V, and not 0.4 as he insinuates. 2x difference BTW. Third, lower voltage swing is more prone to ground bounce and other type of noise. Therefore there is always a technical compromise. If you have never done any real engineering but only studied theoretically some atmospheric phenomena, you have no clue about realities of the problem. Even if you have recently discovered "inductive coupling" for yourself. After all these years of struggling with Rambus "signal integrity" issues (3-rd RIMM recall, 4-8-16 chip RIMM incompatibilities) , it is highly hypocritical to brag about Rambus signal quality.

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