Rambus (RMBS) - Eagle or Penguin Message Board

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Technology Stocks : Rambus (RMBS) - Eagle or Penguin

RMBS 88.13

+1.0%

Nov 21 9:30 AM EST

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To: Bilow who wrote (75401)	7/7/2001 9:20:16 PM
From: gnuman	Read Replies (1) of 93625

Actually, RDRAM has far worse EMI problems. The reason is simple, they're at much higher speeds. That's why RDRAM traces have to be provided with ground traces between the signal traces,...... Strip or micro-strip transmission line is well known as an effective method of controlling EMI on a PCB. The long RSL lengths require ground traces between to minimize cross-talk, not EMI. In other words, RlDRAM takes data at 3x the speed of DDR, but using traces that are 3.33x as wide. Now do you get it? The RSL trace is only 18 mil's wide. Whether the signal frequencies are 133MHz or 400Mhz isn't as important as the edge transition rate, amplitude and characteristics of the trace. The use of a current source into a properly terminated low impedance strip or micro-strip line generates very low emission levels since they are primarily in the TEM mode. JMO's and no p***ing contest. <G>

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