Patel [mailto:whizpla...@yahoo.com]
Sent: Thursday, August 15, 2002 12:57 PM
To: Chris Allen
Cc: EMC
Subject: Re: Meeting CISPR in Fast Ethernet board
Hi! Thanks for all the responses. I spoke with the EMC
guy and here is what he has to say. In our design we
are providing both RJ21 and RJ45
Hi Bob,
Is it broadband noise? Maybe a DC-DC converter on the board? Or do you have a
peak at 62.5MHz? The 8B/10B encoding gets you to 125MB/s, and an 0101 idle
pattern effectively gives you 62.5MHz.
Best regards,
Dave
Bob Patel wrote:
Hi! I had a question regarding meeting EMI on my board
for
Based on little info you have provided, I am making the
following assumptions.
1) The noise is broadband noise coming from MLT3 signal
(by fast you mean 100 Mbps?).
2) It is not from the power supplly, which can also
radiate similarly looking noise in this portion of the
spectrum.
You can
Hi! I had a question regarding meeting EMI on my board
for CISPR. I have a Fast Ethernet card and the 125MHz
Fast Ehternet fails the CISPR in the 30Mhz to 100Mhz
limit.
In the layout care has been taken to isolate the
chassis or quiet ground from Digital ground by
isolating the ground from the
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