I once wrote down an invention disclosure on SMD-capacitors and construction with a very low inductance and appropriate to be used with a very low inductive connection. After submission the research done by our IP department came up with a Murata patent covering capacitors with an comparable construction and with only 10 pH self-inductance. For further information I guess you may find something at the Internet. Kind regards Boris Traa System design engineer EMC PDSL/EMC3 Building WDV, room 1.01 Prof Holstlaan 4 5656AA Eindhoven, The Netherlands Tel: ++ 31 40 27 43766 Fax: ++ 31 40 27 42224 E-mail: boris.traa@xxxxxxxxxxxx Seri: btraa@nlsce1 The information contained in this message is confidential and may be legally privileged. The message is intended solely for the addressee(s). If you are not the intended recipient, you are hereby notified that any use, dissemination, or reproduction is strictly prohibited and may be unlawful. If you are not the intended recipient, please contact the sender by return e-mail and destroy all copies of the original message. Scott McMorrow <scott@xxxxxxxxxxxxx> Sent by: si-list-bounce@xxxxxxxxxxxxx 09-07-2004 17:48 Please respond to scott To: zhang_kun@xxxxxxxxxx silist <si-list@xxxxxxxxxxxxx> cc: (bcc: Boris Traa/EHV/PDSL/PHILIPS) Subject: [SI-LIST] Re: Is Impedance Enough for Describing the PDS? Classification: Zhangkun, Zhangkun wrote: >How about the value of the inductance of these kind of capacitors? When the cap is soldered on the PCB, there is leading inductance of about 1nH. This could not be eliminated by better caps. > > > Actually, better designed capacitors and better mounting structures do help. Steve and I both have developed mounting structures for some of these capacitors that are down in the 200 pH range, with a total mounted device inductance below 400 pH. It's all a matter of physics and good design practices. With X2Y and IDC capacitors, we can obtain between a 3 and 4-to-1 part count reduction over 0603 capacitors with the best designed mounting solution. regards, scott -- Scott McMorrow Teraspeed Consulting Group LLC 121 North River Drive Narragansett, RI 02882 (401) 284-1827 Business (401) 284-1840 Fax (503) 750-6481 Cellular http://www.teraspeed.com Teraspeed is the registered service mark of Teraspeed Consulting Group LLC ------------------------------------------------------------------ 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 FAQ wiki page is located at: http://si-list.org/wiki/wiki.pl?Si-List_FAQ List technical documents are available at: http://www.si-list.org List archives are viewable at: //www.freelists.org/archives/si-list or at our remote archives: http://groups.yahoo.com/group/si-list/messages Old (prior to June 6, 2001) list archives are viewable at: http://www.qsl.net/wb6tpu ------------------------------------------------------------------ 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 FAQ wiki page is located at: http://si-list.org/wiki/wiki.pl?Si-List_FAQ List technical documents are available at: http://www.si-list.org List archives are viewable at: //www.freelists.org/archives/si-list or at our remote archives: http://groups.yahoo.com/group/si-list/messages Old (prior to June 6, 2001) list archives are viewable at: http://www.qsl.net/wb6tpu