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Technology Stocks : Rambus (RMBS) - Eagle or Penguin -- Ignore unavailable to you. Want to Upgrade?

To: John Walliker who wrote (25405)	7/21/1999 12:41:00 PM
From: J_W	Respond to of 93625

DRDRAM may have a slightly perverse advantage with its 400MHz clock, in that the 3rd harmonic (and higher) fall outside the frequency range of 30 to 1000 MHz where EMC measurements are normally carried out. The 2nd harmonic will have much lower energy in a symmetrical square wave signal. John, What you say is true. A perfect square wave would consist of only odd harmonics. However in reality we can never achieve a perfect square wave, so there will always be some even harmonic content. But what even harmonic content does occur will be at very suppressed levels when compared to odd harmonics content. The 2nd harmonic at 800 MHz will be at very low levels while the third harmonic at 1200MHz will contain significant power. Where I do see a problem is with PC600 RDRAM. It's 3rd harmonic would occur at 900MHz, within the spectrum where measurements are taken. But we must keep in mind that the Rambus Channel uses complementary clock signals which should keep emmisions to a minimum. But this is well beyond my area of expertise. Regards, Jim