Vicente It is not a problem getting a large amount of energy to the DUT, it is a problem of getting the same energy over the measurement frequency range. = If there is an inductive launch it will act as a low pass filter. Thus the energy will be different at different frequencies. 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 Cavanna, Vicente Vaca (Sr. ; ProCurve ASICs) Sent: Tuesday, April 24, 2007 5:20 PM To: homer.si.mpson66@xxxxxxxxx; si-list@xxxxxxxxxxxxx Subject: [SI-LIST] Re: TDR Analsis Equipment..Tektronix vs Agilent? With a VNA one can increase the power level of the stimulus and get = more energy into and through the DUT even when the DUT is lossy and/or = extremely reflective. With a TDR this is not as easy to do; in fact the TDRs I = have used do not permit such control. Vicente > -----Original Message----- > From: si-list-bounce@xxxxxxxxxxxxx=3D20 =20 >[mailto:si-list-bounce@xxxxxxxxxxxxx] On Behalf Of Peter J > Sent: Tuesday, April 24, 2007 9:36 AM > To: si-list@xxxxxxxxxxxxx > Subject: [SI-LIST] Re: TDR Analsis Equipment..Tektronix vs Agilent?=20 >=3D20 Hi, > The biggest problem in using a TDR or VNA for that matter is=3D20 > to get enough energy into the DUT since even a very small=3D20 > inductance at the connection point from the TDR to the DUT=3D20 > will give an insertion loss. It's possible to get a return=3D20 > loss of -20dB at 5GHz if you work hard. At 50 GHz it's hard=3D20 > to get -3 dB RL which means that half of the power will enter=3D20 > the DUT and the rest is wasted. By using a VNA it is possible=3D20 > to make a TRL calibration kit and remove the effect of the=3D20 > testsystem and only get the DUT characteristics. > I use a short pigtail with a thin semirigid coax instead of a=3D20 > probe when I do measurements with the TDR(tektronix). It=3D20 > increases the accuracy a great deal. >=3D20 > BR > Peter >=3D20 > -----Original Message----- >=3D20 > From: si-list-bounce@xxxxxxxxxxxxx > [*mailto:si-list-bounce@xxxxxxxxxxxxx*<si-list-bounce@xxxxxxxxxxxxx>] > On Behalf Of ext Asbenson, Lyndell L >=3D20 > Sent: 24. april 2007 02:27 >=3D20 > To: heidi.barnes@xxxxxxxxxx; si-list@xxxxxxxxxxxxx >=3D20 > Cc: timothy.j.nash@xxxxxxxx; tom_cip_11551@xxxxxxxxx >=3D20 > Subject: [SI-LIST] Re: TDR Analsis Equipment..Tektronix vs Agilent? >=3D20 > Dedicated TDR is much easer to setup then going the VNA route -Lyndell >=3D20 > -----Original Message----- >=3D20 > From: si-list-bounce@xxxxxxxxxxxxx > [*mailto:si-list-bounce@xxxxxxxxxxxxx*<si-list-bounce@xxxxxxxxxxxxx> > ] >=3D20 > On Behalf Of Barnes, Heidi >=3D20 > Sent: Monday, April 23, 2007 12:17 PM >=3D20 > To: si-list@xxxxxxxxxxxxx >=3D20 > Cc: timothy.j.nash@xxxxxxxx; tom_cip_11551@xxxxxxxxx >=3D20 > Subject: [SI-LIST] Re: TDR Analsis Equipment..Tektronix vs Agilent? >=3D20 > Hi Tom, >=3D20 > Tim is correct in that probing is not a simple task. If you=3D20 > have the time and patience, a Vector Network Analyzer with=3D20 > PCB Thru-Reflect-Line Calibration standards can provide a=3D20 > method for getting measured electrical data for a PCB=3D20 > structure that does not include the probes or connectorized=3D20 > transitions on to the printed circuit board. The S-Parameter=3D20 > data can then be converted to time domain for TDR analysis of=3D20 > the discontinuities and a 40GHz box will give you around an=3D20 > 18pS rise time pulse (an edge that is ~100mils long for a PCB=3D20 > dielectric constant of ~4) which gives a significant amount=3D20 > of detail (50mils is rather ambitious unless you have money=3D20 > for the top end 110GHz VNA's or 8pS rise time TDR scopes).=3D20 > The other thing to think about is that most applications=3D20 > running about 3Gbps are differential so it is also nice to=3D20 > have a 4-Port system for measurements. >=3D20 > Regards, >=3D20 > Heidi >=3D20 > -----Original Message----- >=3D20 > From: si-list-bounce@xxxxxxxxxxxxx > [*mailto:si-list-bounce@xxxxxxxxxxxxx*<si-list-bounce@xxxxxxxxxxxxx> > ] >=3D20 > On Behalf Of Nash, Timothy J >=3D20 > Sent: Monday, April 23, 2007 11:33 AM >=3D20 > To: tom_cip_11551@xxxxxxxxx; si-list@xxxxxxxxxxxxx >=3D20 > Subject: [SI-LIST] Re: TDR Analsis Equipment..Tektronix vs Agilent? >=3D20 > Hi, Tom. >=3D20 > I have tried using a Tektronix TDR (I'm not sure of the=3D20 > model) to probe PCBs before, and found that what probe you=3D20 > were using, and WHAT you were probing, can make or break your=3D20 > measurement. We were using a hand-held pressure-actuated type=3D20 > probe and simply bending your wrist a little would change the=3D20 > response. We had a tough time even discerning between two=3D20 > vias spaced an inch apart from each other. I believe the=3D20 > probes used by most PCB manufacturers are on a robotic arm=3D20 > and they are probing PCB coupons that have pre-defined TDR=3D20 > features. I found it very difficult to glean much useful info=3D20 > from real PCB traces when the discontinuities were as close=3D20 > together as what you are describing. I don't believe this was=3D20 > a fault of the scope - just a function of the probing method=3D20 > and the feature constraints of the PCB. >=3D20 > Tim >=3D20 >=3D20 >=3D20 >=3D20 >=3D20 > -----Original Message----- >=3D20 > From: si-list-bounce@xxxxxxxxxxxxx > [*mailto:si-list-bounce@xxxxxxxxxxxxx*<si-list-bounce@xxxxxxxxxxxxx> > ] >=3D20 > On Behalf Of tom_cip_11551 >=3D20 > Sent: Monday, April 23, 2007 10:47 AM >=3D20 > To: si-list@xxxxxxxxxxxxx >=3D20 > Subject: [SI-LIST] TDR Analsis Equipment..Tektronix vs Agilent? >=3D20 > Hi to the Signal Integrity community. >=3D20 > I am looking for a set of equipment with wich to do TDR=3D20 > analysis on=3D3D3D20 high speed PCB structures. We are now=3D20 > building boards to run at=3D3D3D20 speeds of 3 Gb/s or faster and=3D20 > I would like to resolve=3D3D3D20 discontinuites within, say, 50=3D20 > mils to 80 mils of each other. >=3D20 > I have gotten quotes from Tektronix and Agilent for TDR=3D20 > equipment. =3D3D3D20 >=3D20 > The Tektronix system consists of the DSA8200 digital sampling=3D20 > =3D3D scope,=3D3D3D20 the 80E04 TDR sampling module and the = 80SICON=3D20 > signal integrity and=3D3D3D20 failure analysis software (a $20K=3D20 > item by itself). >=3D20 > The Agilent system consists of the 86100C scope, the 54754A=3D20 > TDR=3D3D3D20 module and various other software programs for S=3D20 > parameters, Jitter=3D3D3D20 analysis, etc. >=3D20 > I am wondering what the Signal Integrity community at large=3D20 > is=3D3D3D20 using. > Which system is more popular and, most important, cost=3D3D3D20 =3D effective? >=3D20 > What are some of the advantages and drawbacks of each? >=3D20 > Are there other solutions on the market that are more cost effective?=20 >=3D20 Thank You >=3D20 > Tom >=3D20 >=3D20 >=3D20 > ------------------------------------------------------------------ >=3D20 > To unsubscribe from si-list: >=3D20 > si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field >=3D20 > or to administer your membership from a web page, go to: >=3D20 > *//www.freelists.org/webpage/si-list*<http://www.freelist s.org/webpage/si-list> >=3D20 > For help: >=3D20 > si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field =3D20 >=3D20 >=3D20 > List technical documents are available at: >=3D20 > *http://www.si-list.net* <http://www.si-list.net/> >=3D20 > List archives are viewable at: =3D3D3D20 >=3D20 > *//www.freelists.org/archives/si-list*<http://www.freelis ts.org/archives/si-list> >=3D20 > or at our remote archives: >=3D20 *http://groups.yahoo.com/group/si-list/messages*<http://groups .yahoo.com/group/si-list/messages> >=3D20 > Old (prior to June 6, 2001) list archives are viewable at: =3D20 > *http://www.qsl.net/wb6tpu* <http://www.qsl.net/wb6tpu> >=3D20 > =3D3D3D20 >=3D20 > ------------------------------------------------------------------ >=3D20 > To unsubscribe from si-list: >=3D20 > si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field >=3D20 > or to administer your membership from a web page, go to: >=3D20 > *//www.freelists.org/webpage/si-list*<http://www.freelist s.org/webpage/si-list> >=3D20 > For help: >=3D20 > si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field =3D20 >=3D20 >=3D20 > List technical documents are available at: >=3D20 > *http://www.si-list.net* <http://www.si-list.net/> >=3D20 > List archives are viewable at: =3D3D3D20 >=3D20 > *//www.freelists.org/archives/si-list*<http://www.freelis ts.org/archives/si-list> >=3D20 > or at our remote archives: >=3D20 *http://groups.yahoo.com/group/si-list/messages*<http://groups .yahoo.com/group/si-list/messages> >=3D20 > Old (prior to June 6, 2001) list archives are viewable at: =3D20 > *http://www.qsl.net/wb6tpu* <http://www.qsl.net/wb6tpu> >=3D20 > =3D3D3D20 >=3D20 > ------------------------------------------------------------------ >=3D20 > To unsubscribe from si-list: >=3D20 > si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field >=3D20 > or to administer your membership from a web page, go to: >=3D20 > *//www.freelists.org/webpage/si-list*<http://www.freelist s.org/webpage/si-list> >=3D20 > For help: >=3D20 > si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field =3D20 >=3D20 >=3D20 > List technical documents are available at: >=3D20 > *http://www.si-list.net* <http://www.si-list.net/> >=3D20 > List archives are viewable at: =3D3D20 >=3D20 > *//www.freelists.org/archives/si-list*<http://www.freelis ts.org/archives/si-list> >=3D20 > or at our remote archives: >=3D20 *http://groups.yahoo.com/group/si-list/messages*<http://groups .yahoo.com/group/si-list/messages> >=3D20 > Old (prior to June 6, 2001) list archives are viewable at: =3D20 > *http://www.qsl.net/wb6tpu* <http://www.qsl.net/wb6tpu> >=3D20 > =3D3D20 >=3D20 > ------------------------------------------------------------------ >=3D20 > To unsubscribe from si-list: >=3D20 > si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field >=3D20 > or to administer your membership from a web page, go to: >=3D20 > *//www.freelists.org/webpage/si-list*<http://www.freelist s.org/webpage/si-list> >=3D20 > For help: >=3D20 > si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field =3D20 >=3D20 >=3D20 > List technical documents are available at: >=3D20 > *http://www.si-list.net* <http://www.si-list.net/> >=3D20 > List archives are viewable at: >=3D20 > *//www.freelists.org/archives/si-list*<http://www.freelis ts.org/archives/si-list> >=3D20 > or at our remote archives: >=3D20 *http://groups.yahoo.com/group/si-list/messages*<http://groups .yahoo.com/group/si-list/messages> >=3D20 > Old (prior to June 6, 2001) list archives are viewable at: =3D20 > *http://www.qsl.net/wb6tpu* <http://www.qsl.net/wb6tpu> >=3D20 >=3D20 > ------------------------------------------------------------------ > To unsubscribe from si-list: > si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field >=3D20 > or to administer your membership from a web page, go to: > //www.freelists.org/webpage/si-list >=3D20 > For help: > si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field >=3D20 >=3D20 > List technical documents are available at: > http://www.si-list.net >=3D20 > 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 >=3D20 >=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