Hello Mark, Here is a shorter URL to use for accessing the Agilent document along = with links to Part 1 and Part 2 on useful measurement techniques for = signal integrity. Page 20 of Part 3 describes an excellent technique for getting accurate = S-parameters of a test fixture for de-embedding both the phase and = magnitude.... Part 3: The ABC's of De-Embedding http://cp.literature.agilent.com/litweb/pdf/5989-5765EN.pdf in addition here are the other two parts: Part 1: Single-Port TDR, TDR/TDT, and 2-Port TDR http://cp.literature.agilent.com/litweb/pdf/5989-5763EN.pdf Part 2: 4-Port TDR/VNA/PLTS http://cp.literature.agilent.com/litweb/pdf/5989-5764EN.pdf Regards, Heidi Barnes Americas Application Development Center Semiconductor Test Solutions Verigy Inc. -----Original Message----- From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] = On Behalf Of mike_resso@xxxxxxxxxxx Sent: Monday, July 30, 2007 12:51 PM To: Mark.Randol@xxxxxxxxxx; si-list@xxxxxxxxxxxxx Subject: [SI-LIST] Re: Port Extension Algorithm Hi Mark, VNA calibration is quite flexible, but it's important to know which type = =3D of error correction to use at the right time. Understanding =3D de-embedding, port rotation, time domain gating, SOLT, TRL, LRM, =3D normalization and a host of others can be a daunting task. We just =3D finished a good app note on this subject called, " Signal Integrity =3D Analysis Series Part 3: The ABCs of De-Embedding". To check it out, go = =3D here: http://www.home.agilent.com/agilent/redirector.jspx?action=3D3Dref&cname=3D= 3D=3D AGILENT_EDITORIAL&ckey=3D3D1224306&lc=3D3Deng&cc=3D3DUS I hope this helps. Regards, Mike Mike Resso Product Manager Signal Integrity Applications Component Test Division Agilent Technologies 1400 Fountaingrove Pkwy. Mail Stop 3USG Santa Rosa, Ca. 95403 707-577-6529=3D20 =3D20 =3D20 -----Original Message----- From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] = =3D On Behalf Of Mark Randol Sent: Monday, July 30, 2007 12:37 PM To: si-list@xxxxxxxxxxxxx Subject: [SI-LIST] Re: Port Extension Algorithm Port extensions simply add in an amount of electrical length that the user specifies. The phase is mathematically 'un-wound' over frequency based on that setting. No losses or other problems are accounted for. The assumption is a 'perfect Zo transmission line of electrical length x'. Oftentimes it is plenty good enough. If you need more than that, you need to de-embed the structure in question with data from either simulation or measurements. -- Mark Randol, RF Evaluation & Application Engineer ON Semiconductor 901 S. Mopac Expressway Barton Oaks 4, Suite 343 Austin, TX 78746 512-329-5640 (voice), 512-329-8151 (FAX) =3D3D20 =3D3D20 > -----Original Message----- > From: si-list-bounce@xxxxxxxxxxxxx=3D3D20 > [mailto:si-list-bounce@xxxxxxxxxxxxx] On Behalf Of=3D3D20 > codymiller@xxxxxxxxxx > Sent: Monday, July 30, 2007 2:23 PM > To: si-list@xxxxxxxxxxxxx > Subject: [SI-LIST] Port Extension Algorithm >=3D3D20 > I would like to understand the algorithm used when the port=3D3D20 > extension mode is used on a VNA. I have some S11 data that=3D3D20 > was previously taken and would like to apply a port extension=3D3D20 > to it. Any thoughts? >=3D3D20 > Thanks, > Cody Miller ------------------------------------------------------------------ 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.net List archives are viewable at: =3D20 //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 =3D20 ------------------------------------------------------------------ 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.net 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.net 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