[SI-LIST] Re: Fwd: Re: About the chassis gnd and logic gnd
- From: steve weir <weirsp@xxxxxxxxxx>
- To: jrbarnes@xxxxxxxxx, si-list@xxxxxxxxxxxxx
- Date: Thu, 25 Mar 2004 18:01:22 -0800
John, thanks. Everything has its place. Given their low cost, and high
performance, I have found X2Y caps can be a very effective tool. Some
situations will call for other solutions for some of the reasons you mention.
Regards,
Steve.
At 05:29 PM 3/25/2004 -0500, John Barnes wrote:
>Steve,
>I fully agree with you about the promise of X2Y capacitors to reduce
>noise problems. I discuss X2Y capacitors on pages 8-30, 35-6, and 35-8
>of Robust Electronic Design Reference Book, mainly with regard to their
>use as filters.
>
>I first tested X2Y capacitors nearly four years ago. At that time X2Y
>was concentrating on their use as filters for DC motors and in fuses for
>explosives. In the last year David J. Anthony (see references 218A
>through 218L in http://www.dbicorporation.com/pwr-bib.htm) and James P.
>Muccioli (see references 587 to 590A, ditto) have done a lot of
>characterization, and published a number of papers and application
>notes, on using X2Y capacitors on printed circuit boards. But if you go
>out to the X2Y web site at http://www.x2y.com/ , you will notice
>that many of these application notes are dated December 3, 2003 or
>later. And I shipped off the final manuscript for "Robust" on December
>4th. So this is one area that I *must* update if/when we do a 2nd
>edition of my book.
>
>Almost all of these papers and articles point out the extreme importance
>of proper printed circuit board design to get good performance out X2Y
>capacitors. And this again points out the importance of looking ahead,
>early in design, to design them in.
>
>The advantage of ferrite sleeves and ferrite toroids is that we can use
>them no matter what kind of a mess a person has made of their printed
>circuit boards...
>
> John Barnes KS4GL, PE, NCE, ESDC Eng, SM IEEE
> dBi Corporation
> http://www.dbicorporation.com/
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Steve Weir
Teraspeed Consulting Group LLC
2926 SE Yamhill St.
Portland, OR 97214
(503) 239-5536
http://www.teraspeed.com
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