We design oscillators out of discrete components to meet the minimum drive
requirements.
If a can oscillator is used, RC terminations and power filtering is usually
required to keep the harmonics from flowing into other ciruits.
Regards,
Wolf Josenhans
"Allen Tudor" <[email protected]> on 01/21/2000 10:38:09 AM
Please respond to "Allen Tudor" <[email protected]>
Sent by: "Allen Tudor" <[email protected]>
To: [email protected], [email protected], [email protected]
cc: (Wolfgang Josenhans/MW/US/3Com)
Subject: Re: RE: EMC Circuit Board Design
What do you recommend other than metal can oscillators in item 5 below?
Allen Tudor, Compliance Engineer
PairGain Technologies tel: (919)875-3382
6531 Meridien Drive fax: (919)876-1817
Raleigh, NC 27616 email: [email protected]
>>> "cetest" <[email protected]> 01/21 9:50 AM >>>
The most common mistakes carried out on PCB are:
1 Use 2-layer instead of multi-layer boards
2 Permit high F clocks to go trough long traces (> 4 Mhz)
3 Place connectors all over the surface instead of corner or edge
4 Let input and out lines of analog and power circuits run unfiltered to the
cable
5 Use metal can oscillators (too high current drive)
6 Empty copper-fill grounded through thin traces (copper fill is of no use
to emi)
7 Create 2 different ground planes that will compete for "real emc ground".
8....
Regards,
Gert Gremmen
ce-test qualified testing
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>-----Original Message-----
>From: [email protected] [mailto:[email protected]]On Behalf
>Of [email protected]
>Sent: Friday, January 21, 2000 1:48 PM
>To: [email protected]
>Subject: EMC Circuit Board Design
>
>
>
>
>
>Dear List-Members,
>
>I am requesting information/opinions/etc. on the following:
>
>When circuit boards are designed, what are the common mistakes that the
>circuit board designers make regarding EMC (multi-layer boards in
>particular)?
>
>You can respond to me directly but I would prefer a response to the list as
>I believe that the question is of interest to many on this list-server. In
>either event I will compile the responses and resend the compilation later.
>
>Thanks for your time,
>
>Bob Heller
>3M Company
>
>
>
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>
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