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Technology Stocks : Rambus (RMBS) - Eagle or Penguin
RMBS 95.59+5.6%9:31 AM EST
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To: Ali Chen who wrote (34477)11/15/1999 7:11:00 AM
From: John Walliker  Read Replies (1) of 93625
 
Ali,

Some more thoughts about reflections.

In my earlier posting I described a simulation of the Rambus matching network which indicated that about 1% of the incident signal is reflected at each device.

It occurred to me that some people might then assume that if the system were populated with 32 devices, 32% of the incoming signal would be reflected. Of course, it isn't as simple as that because all the reflections arrive with different phases and tend to cancel out.

So I redid the simulation with 6 devices in a row - this being the most that the Motorola package can cope with on-screen.

At 400 MHz the reflected signal was still around 1%
at 800 MHz the reflected signal is about 1.8%
at 1200MHz the reflected signal is about 4%.

Bear in mind that the signal level at 1200 MHz will be very much lower than that at lower frequencies because of the 1ns rise and fall times imposed by the slew rate limiting of the RSL outputs.

I am very pleasantly surprised by just how good the matching networks used by Rambus are. In particular, the way that performance is maintained when multiple devices are cascaded together.

This is much better than I had expected. The Rambus channel really does seem to be of very high quality.

Try it for yourself.

John
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