Srinivas, Thanks for the reply. The link didn't work (for me anyway). But I did go to the US Patent site = and found the patent by searching on his last name. For anyone = interested, it's patent # 6,366,972. I'd really like to see John Grebenkemper's article "Network Topology = Analysis Using the Reflection Coefficient" if anyone has a link... Thanks! Scott -----Original Message----- From: Venkataraman, Srinivas [mailto:srinivas.venkataraman@xxxxxx] Sent: Wednesday, February 25, 2004 1:16 PM To: rhaller@xxxxxxxxxx; Newton, Scott Cc: si list; Grebenkemper, John Subject: RE: [SI-LIST] Re: Middle (Star) Termination Link to John Grebenkemper's patent document on star termination attached. http://patft.uspto.gov/netacgi/nph-Parser?Sect1=3DPTO2&Sect2=3DHITOFF&p=3D= 1&u=3D /netahtml/search-bool.html&r=3D1&f=3DG&l=3D50&co1=3DAND&d=3Dptxt&s1=3Dgre= benkemper.I NZZ.&OS=3DIN/grebenkemper&RS=3DIN/grebenkemper -----Original Message----- From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On Behalf Of Robert Haller Sent: Wednesday, February 25, 2004 9:54 AM To: Scott.Newton@xxxxxxxxxxxxxxxx Cc: si list Subject: [SI-LIST] Re: Middle (Star) Termination Scott, John Grebenkemper wrote an excellent paper that is available in the Designcon98 precedings "Network Topology Analysis Using The Reflection Coefficient" that does and excellent job of not only explaining the theory of middle termination but also presents the math. Regards Bob Newton, Scott wrote: > Can anyone please provide a brief explanation regarding the theory of > a middle termination scheme? In the book" High Speed Digital Design" > by Johnson&Graham the topic seems to be glossed over. It essentially says that providing resistors connected in the middle of a star network that have impedance of 1/3 Zo work by halving the voltage at the node. I've used Hyperlynx to simulate this arrangement and it works well. I've searched the web and haven't found a satisfactory explanation. >=20 > Thanks in advance. > ------------------------------------------------------------------ > 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 technical documents are available at: > http://www.si-list.org > > List archives are viewable at: =20 > //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 > =20 > -- Robert J. Haller (rhaller@xxxxxxxxxx) Principal Consultant Signal Integrity Software Inc. 6 Clock Tower Place, Suite 250 Maynard, MA 01754 Phone: (978) 461-0449, ext 15 ------------------------------------------------------------------ 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 technical documents are available at: http://www.si-list.org List archives are viewable at: =20 //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 =20 ------------------------------------------------------------------ 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 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