Craig Crosstalk is really insertion loss between two nets. Just measure TDT = from net1 to net2 and compute. Tom Dagostino Teraspeed(R) Labs 13610 SW Harness Lane Beaverton, OR 97008 503-430-1065 tom@xxxxxxxxxxxxx=20 www.teraspeed.com=20 Teraspeed Consulting Group LLC 121 North River Drive Narragansett, RI 02882 401-284-1827 -----Original Message----- From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] = On Behalf Of Craig Twardy Sent: Wednesday, November 15, 2006 11:49 AM To: Chris.Cheng@xxxxxxxxxxxx; dgun@xxxxxxxxxx; si-list@xxxxxxxxxxxxx Subject: [SI-LIST] Re: A question for the instrument guys on TDR and TDT How would this (TDR/TDT) work for measuring crosstalk? Craig=3D20 -----Original Message----- From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On Behalf Of Chris Cheng Sent: November 14, 2006 7:51 PM To: dgun@xxxxxxxxxx; si-list@xxxxxxxxxxxxx Subject: [SI-LIST] Re: A question for the instrument guys on TDR and TDT I can only speak from a system design perspective. The high speed =3D3D sampling scope is free because that's basic lab equipment every hardware = =3D3D manager will budget for his lab. A VNA is an extra equipment solely =3D = =3D3D used for channel modelling/testing or the remote possibility of PD =3D3D analysis. I never believe in highspeed PD problem beyond the die and = =3D3D package so I never can justify a VNA other than channel measurements. I = =3D3D do have both but I think an impulse response on a sampling scope can =3D = =3D3D satisfies a lot of system designers need for S-parameter measurements. = =3D =3D3D And I believe that scope company up North is listening :-D (just came = =3D =3D3D back from their seminar, LOL) Now if I can use that VNA budget for a Ferrari...... -----Original Message----- From: si-list-bounce@xxxxxxxxxxxxx = [mailto:si-list-bounce@xxxxxxxxxxxxx]On Behalf Of dgun@xxxxxxxxxx Sent: Tuesday, November 14, 2006 4:04 PM To: si-list@xxxxxxxxxxxxx Subject: [SI-LIST] Re: A question for the instrument guys on TDR and TDT Wouldn't a scope fast enough to capture the reflections or transmissions = of a 35ps pulse be as or more expensive than a low-cost VNA? -- Daniel > From: "Chris Cheng" <Chris.Cheng@xxxxxxxxxxxx> > > I can understand the merit of a step response and direct read out of = =3D =3D3D =3D3D3D3D > impedance profile. > Will it be easy to also include a mode with a sharp pulse instead of = =3D =3D3D =3D3D3D3D > step for an impulse response ? If you have a circuit to generate a = =3D3D 35ps =3D3D3D =3D3D3D3D > step, can you use it to generate a 35ps pulse also ? I think there are > =3D3D =3D3D3D =3D3D3D3D > steps you can do to convert one to the other but a direct impulse = =3D3D =3D3D3D3D > response is just too good to pass up. > Network analyzer on the cheap. > Thanks in advanced, > Chris --=3D3D3D20 Search for products and services at:=3D3D3D20 http://search.mail.com ------------------------------------------------------------------ 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: =3D3D20 //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 =3D3D20 ------------------------------------------------------------------ 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: =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 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: =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 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