Please take pictures of little Gina at the EMC test range demonstrating her prowess with her beads. Steve. On 9/12/2014 2:41 PM, Randy Dawson wrote: > 'The National Ferrite Bead Association' > I will have to put little Gina onto that resource, she has several > bead projects, different color ferrites, she is all over the spectrum. > > > Date: Fri, 12 Sep 2014 14:30:16 -0700 > > From: weirsi@xxxxxxxxxx > > To: si-list@xxxxxxxxxxxxx > > Subject: [SI-LIST] Re: Ferrite Beads on Differential Signal Lines? > > > > While often abused, ferrite beads are a tool that have legitimate > > purposes. What makes no sense is to either: > > > > 1) "Solve" a problem that doesn't exist, or > > 2) Solve a problem with inappropriate means. > > > > Ferrite beads are very useful in these sorts of situations: > > > > 1) As part of a properly decoupled high insertion loss filters. > > 2) As components in EMI filters. > > > > Places where they should not be used, or at least not used alone: > > > > 1) As power feeds to broadband amplifiers. (All digital logic devices > > qualify as broadband amplifiers.) > > 2) In circuits where their low to medium frequency behavior of a high Q > > linear inductor has not been fully considered. > > > > Unfortunately, there have been many times that people have misused > > ferrite beads creating bigger problems than the beads were intended to > > solve. > > > > The National Ferrite Bead Association reminds us: > > > > "Ferrite beads don't kill designs. Lazy engineers do." > > > > Best Regards, > > > > > > Steve > > > > On 9/12/2014 8:15 AM, Lee wrote: > > > It makes no sense to put ferrite beads in any signal line. How did > this get > > > started? > > > > > > -----Original Message----- > > > From: Craig Francis > > > Sent: Thursday, September 11, 2014 4:11 PM > > > To: si-list@xxxxxxxxxxxxx > > > Subject: [SI-LIST] Ferrite Beads on Differential Signal Lines? > > > > > > SI-List, > > > I haven't seen any literature concerning using ferrite beads on > each signal > > > line of a differential pair. > > > Usually only a common-mode choke is used to reduce common-mode EMI. > > > > > > Can ferrite beads be used on a differential pair to increase the > the rise > > > time of the signal and reduce unnecessary high-frequency content > that may > > > radiate? > > > > > > The two ferrite beads would be sized to allow the bandwidth > necessary for > > > the differential signal's highest data rate. > > > > > > > > > Thanks, > > > Craig Francis > > > > > > > > > ------------------------------------------------------------------ > > > To unsubscribe from si-list: > > > si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field > > > > > > or to administer your membership from a web page, go to: > > > //www.freelists.org/webpage/si-list > > > > > > For help: > > > si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field > > > > > > > > > List forum is accessible at: > > > http://tech.groups.yahoo.com/group/si-list > > > > > > List archives are viewable at: > > > //www.freelists.org/archives/si-list > > > > > > Old (prior to June 6, 2001) list archives are viewable at: > > > http://www.qsl.net/wb6tpu > > > > > > > > > > > > > > > ----- > > > No virus found in this message. > > > Checked by AVG - www.avg.com > > > Version: 2014.0.4765 / Virus Database: 4015/8184 - Release Date: > 09/09/14 > > > > > > ------------------------------------------------------------------ > > > To unsubscribe from si-list: > > > si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field > > > > > > or to administer your membership from a web page, go to: > > > //www.freelists.org/webpage/si-list > > > > > > For help: > > > si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field > > > > > > > > > List forum is accessible at: > > > http://tech.groups.yahoo.com/group/si-list > > > > > > List archives are viewable at: > > > //www.freelists.org/archives/si-list > > > > > > Old (prior to June 6, 2001) list archives are viewable at: > > > http://www.qsl.net/wb6tpu > > > > > > > > > > > > > > > -- > > Steve Weir > > IPBLOX, LLC > > 1580 Grand Point Way > > MS 34689 > > Reno, NV 89523-9998 > > www.ipblox.com > > > > (775) 299-4236 Business > > (866) 675-4630 Toll-free > > (707) 780-1951 Fax > > > > All contents Copyright (c)2013 IPBLOX, LLC. All Rights Reserved. > > This e-mail may contain confidential material. > > If you are not the intended recipient, please destroy all records > > and notify the sender. > > > > ------------------------------------------------------------------ > > To unsubscribe from si-list: > > si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field > > > > or to administer your membership from a web page, go to: > > //www.freelists.org/webpage/si-list > > > > For help: > > si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field > > > > > > List forum is accessible at: > > http://tech.groups.yahoo.com/group/si-list > > > > List archives are viewable at: > > //www.freelists.org/archives/si-list > > > > Old (prior to June 6, 2001) list archives are viewable at: > > http://www.qsl.net/wb6tpu > > > > -- Steve Weir IPBLOX, LLC 1580 Grand Point Way MS 34689 Reno, NV 89523-9998 www.ipblox.com (775) 299-4236 Business (866) 675-4630 Toll-free (707) 780-1951 Fax All contents Copyright (c)2013 IPBLOX, LLC. All Rights Reserved. This e-mail may contain confidential material. If you are not the intended recipient, please destroy all records and notify the sender. ------------------------------------------------------------------ To unsubscribe from si-list: si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field or to administer your membership from a web page, go to: //www.freelists.org/webpage/si-list For help: si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field List forum is accessible at: http://tech.groups.yahoo.com/group/si-list List archives are viewable at: //www.freelists.org/archives/si-list Old (prior to June 6, 2001) list archives are viewable at: http://www.qsl.net/wb6tpu