From: Vigliarolo Roberto ([email protected])
Date: Thu Feb 03 2000 - 01:11:49 PST
Look at http://emcesd.com/pdf/cd94scr.pdf
Regards,
Roberto Vigliarolo
Ferrovie dello Stato SpA
> ----------
> Da: greg kimball[SMTP:[email protected]]
> Risposta a: [email protected]
> Inviato: gioved� 3 febbraio 2000 6.03
> A: [email protected]
> Oggetto: Re: [SI-LIST] : LVDS signal observation
>
> Joe-
> I'll second the motion re passive probes being of value at hundreds to GHz
> range. Take a note of the Xc of the TEK P6248 - At 500MHz(0.7ns tr), the
> 1.5pF
> differential input capacitance is 212 ohms!! I believe the passive probe
> design Howie Johnson mentions in his High Speed Digital Design book
> is about 1K and a fraction of a pF I believe, and much better usable
> voltage
> range. BUT, on the downside - it is only single-ended.
>
> Does anyone know of a truly balanced passive diff probe design??
>
> Regards,
> Greg Kimball
> TI Storage Product GP
>
> [email protected] wrote:
>
> > FET probes can be had with very low input C and reasonably high input R,
> > and very nice BW. I prefer passive probes however. They are 5X cheaper,
> > they can be had with 1kOhm input R and they usually fit in smaller
> places
> > than the good active probes. Another benefit is that nobody else wants
> them
> > so the lab thieves leave them right where I put them down :-)
> >
> > If you are going to do any debugging buy a scope with a high single
> trigger
> > sample rate, and watch out for specs based upon interleaving digitizers.
> > The CSA series scopes will do very nicely if your signal is repetitive,
> but
> > if your 'oddity' only occurs once a second you will never see it with
> > anything but a trigger crafted for the oddity and a high sample rate
> single
> > shot scope. The high end Infinium and the Tek TDS684 and TDS694 are the
> > instruments I am familiar with.
> >
> > Joe
> >
> > CEC Analysis and I/O Design
> > Phone: 507.253.0762 Fax: 507.253.4966
> > [email protected]
> >
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