[SI-LIST] Re: stupid VNA / TDR / TDT Measurement / Setup question
- From: "Thomas Beneken" <beneken@xxxxxxxxxxxx>
- To: "'steve weir'" <weirsp@xxxxxxxxxx>, <si-list@xxxxxxxxxxxxx>
- Date: Fri, 14 Nov 2003 13:33:46 +0100
Your point, Steve.
The differential sampling head would be helpful only if connected to "Sig3"
or "Sig4" and their reference plane "PWR". Without access to "PWR" plane
it's useless.
I'm sorry.
Hermann did not mention receiver configuration/technology. So I did no
assumptions about that.
Thomas
> -----Original Message-----
> From: steve weir [mailto:weirsp@xxxxxxxxxx]
> Sent: Friday, November 14, 2003 11:23 AM
> To: beneken@xxxxxxxxxxxx; si-list@xxxxxxxxxxxxx
> Subject: Re: [SI-LIST] Re: stupid VNA / TDR / TDT Measurement / Setup
> question
>
>
> Thomas,
>
> Maybe I'm missing something here, but how is a diff. head
> connected from
> GND to Sig(xx) going to do anything for Hermann's
> measurements? Are you
> assuming that the board will be tested in the system with
> live power? If
> that is the case, then for GND referred signals, the actual signal
> performance will be available to single ended probes anyway.
> A measurement
> from sig to power would be useful for determining impedance
> between the
> two, and that is not what the receivers are going to react to.
>
>
> Regards,
>
>
> Steve.
> At 11:01 AM 11/14/2003 +0100, Thomas Beneken wrote:
> >Hello Hermann,
> >
> >yes, forget the improper referenced tdr results. Use a
> differential sampling
> >head.
> >
> >Mit freundlichen Gruessen
> >Thomas
> >
> >
> > > -----Original Message-----
> > >
> > > Message: 25
> > > Date: Fri, 14 Nov 2003 09:57:16 +0100
> > > From: hermann.ruckerbauer@xxxxxxxxxxxx
> > > Subject: stupid VNA / TDR / TDT Measurement / Setup question
> > >
> > > Hello all,
> > >
> > > I do have a stupid question, maybe you can enlighten me ....
> > >
> > > Assuming a 6 layer board (Sig1 / GND / Sig2 / / Sig3 / Power
> > > / Sig4) with
> > > some single ended ustrip and stripline transmissionlines
> > > teststructures on
> > > all 4 signal layers. There are no passive components on the
> > > PCB (e. g. no C)
> > > My probes do have a signal and a GND pin. All teststructures
> > > does have a
> > > signal pad and a GND pad for contacting with the probe.
> > > Therefor I'm fine with Sig1 and Sig2! both are nice GND
> referenced,
> > > therefore I do not expect a problem with the measurements there!
> > >
> > > But Signal 3 and 4 are Power referenced. And so far there is
> > > not too much AC
> > > short between PWR and GND plane. The distance between this
> > > planes is > 30
> > > mil, therefore I would expect the most AC short coming from
> > > the Vias. And
> > > now I'm not really sure what happens, if I'm doing a VNA
> / TDR / TDT
> > > measurement on Sig3 and Sig4, which are Power referenced, as
> > > my measurement
> > > ground is connected to the GND plane on the board.....
> > >
> > > Can the results tell me something, or can I forget the
> > > results completly ???
> > > Is there a difference for VNA / TDR or TDT Measurments in
> this case ?
> > >
> > >
> > > thanks
> > >
> > >
> > > Hermann
> > >
> > >
> > >
> > >
> > >
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