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Re: Routing signals under crystals

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From Randy Yates <yates@digitalsignallabs.com>
Newsgroups comp.arch.embedded
Subject Re: Routing signals under crystals
Organization Digital Signal Labs
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Date Sun, 25 Aug 2013 21:04:07 -0400
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rickman <gnuarm@gmail.com> writes:

> On 8/24/2013 10:27 PM, Randy Yates wrote:
>> rickman<gnuarm@gmail.com>  writes:
>>
>>> On 8/24/2013 1:16 AM, Mark Borgerson wrote:
>>>>
>>>> I agree with that.   It's probably even less of a problem when the
>>>> fastest clock on the board is in the internal processor of the
>>>> SD card logging the data.  Writing to an SD card can generate quite
>>>> a burst of EMI,  but I haven't seen large effects on crystal behavior.
>>>
>>> Really?  I've never seen significant EMI directly generated by any
>>> chip.
>>
>> How do you know where it's coming from? Do you have screen rooms,
>> antennae, spectrum analyzers, etc., like FCC testing centers do?
>
> Lol, if you have EMI, you fix the board and it goes away, that shows
> it wasn't the chip...  Same with the SD card.  Replace the SD card
> with a different brand and the EMI should change or go away.

Sure. But remember all those funny interactions you were talking about?
-- 
Randy Yates
Digital Signal Labs
http://www.digitalsignallabs.com

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Thread

Routing signals under crystals Luis Filipe Rossi <luisf.rossi@gmail.com> - 2013-08-22 10:33 -0700
  Re: Routing signals under crystals Tim Wescott <tim@seemywebsite.really> - 2013-08-22 16:25 -0500
    Re: Routing signals under crystals upsidedown@downunder.com - 2013-08-23 09:35 +0300
      Re: Routing signals under crystals Tim Wescott <tim@seemywebsite.really> - 2013-08-23 12:43 -0500
  Re: Routing signals under crystals Richard Damon <Richard@Damon-Family.org> - 2013-08-22 21:45 -0400
    Re: Routing signals under crystals MK <mk@nospam.co.uk> - 2013-08-23 08:40 +0100
      Re: Routing signals under crystals Mike Perkins <spam@spam.com> - 2013-08-23 11:05 +0100
        Re: Routing signals under crystals Luis Filipe Rossi <luisf.rossi@gmail.com> - 2013-08-23 04:55 -0700
          Re: Routing signals under crystals rickman <gnuarm@gmail.com> - 2013-08-23 16:10 -0400
          Re: Routing signals under crystals Clifford Heath <no.spam@please.net> - 2013-08-24 09:55 +1000
            Re: Routing signals under crystals rickman <gnuarm@gmail.com> - 2013-08-23 20:23 -0400
              Re: Routing signals under crystals Tom Gardner <spamjunk@blueyonder.co.uk> - 2013-08-24 09:41 +0100
                Re: Routing signals under crystals rickman <gnuarm@gmail.com> - 2013-08-24 12:10 -0400
                Re: Routing signals under crystals Tom Gardner <spamjunk@blueyonder.co.uk> - 2013-08-24 17:21 +0100
                Re: Routing signals under crystals rickman <gnuarm@gmail.com> - 2013-08-24 12:53 -0400
              Re: Routing signals under crystals Clifford Heath <no.spam@please.net> - 2013-08-24 23:11 +1000
            Re: Routing signals under crystals Don Y <this@isnotme.com> - 2013-08-23 19:43 -0700
      Re: Routing signals under crystals Richard Damon <Richard@Damon-Family.org> - 2013-08-24 00:34 -0400
      Re: Routing signals under crystals Mark Borgerson <mborgerson@comcast.net> - 2013-08-23 22:16 -0700
        Re: Routing signals under crystals rickman <gnuarm@gmail.com> - 2013-08-24 12:19 -0400
          Re: Routing signals under crystals Mark Borgerson <mborgerson@comcast.net> - 2013-08-24 09:59 -0700
          Re: Routing signals under crystals Randy Yates <yates@digitalsignallabs.com> - 2013-08-24 22:27 -0400
            Re: Routing signals under crystals rickman <gnuarm@gmail.com> - 2013-08-25 16:20 -0400
              Re: Routing signals under crystals Randy Yates <yates@digitalsignallabs.com> - 2013-08-25 21:04 -0400
                Re: Routing signals under crystals rickman <gnuarm@gmail.com> - 2013-08-27 12:49 -0400

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