[SI-LIST] Re: VNA Calibration
- From: "istvan novak" <istvan.novak@xxxxxxxxxxxxxxxx>
- To: <dgun@xxxxxxxxxx>, <si-list@xxxxxxxxxxxxx>
- Date: Tue, 24 Jun 2003 21:51:01 -0400
Daniel,
Thanks for your comment. You are correct, the instrument's noise floor may
limit us if we switch to narrower bandwidth after calibration. One
scenario, when this may not be an issue is when we do the calibration at
whatever bandwidth is needed to achieve the desired VNA noise floor but
later we have to switch to narrower bandwidth to reject the DUT noise. This
often happens when we measure active devices: either a running DC-DC
converter alone, or the power-distribution network of a live board with
active logic.
Best regards,
Istvan Novak
SUN Microsystems
----- Original Message -----
From: "D G" <dgun@xxxxxxxxxx>
To: <si-list@xxxxxxxxxxxxx>
Sent: Tuesday, June 24, 2003 1:12 AM
Subject: [SI-LIST] Re: VNA Calibration
> This is true if you are increasing IF bandwidth. However, if you are
decreasing IF bandwidth, you might be limited by the IF bandwidth setting
during calibration. If you want to measure low-level signals, be sure to
calibrate at an IF bandwidth that is narrow enough.
>
> --
> Daniel
>
> From: "istvan novak" <istvan.novak@xxxxxxxxxxxxxxxx>
> > Zhangkun,
> >
> > As long as the VNA works properly, there is no need to recalibrate if
you
> > change only the bandwidth. You can check for this by measuring a known
> > component after calibration, than changing the bandwidth and remeasure.
As
> > IF BW goes up, receiver noise may show up at low reading values. That
> > should be all.
> >
> > Regards,
> >
> > Istvan
> >
> >
> > ----- Original Message -----
> > From: "Zhangkun" <zhang_kun@xxxxxxxxxx>
> > To: "si-list" <si-list@xxxxxxxxxxxxx>
> > Sent: Friday, June 20, 2003 7:57 AM
> > Subject: [SI-LIST] VNA Calibration
> >
> >
> > > Dear all:
> > > I have one question about VNA calibration. If I change the IF
Bandwidth,
> > is it necessary to re-calibrate?
> > >
> > > When I change the IF Bandwidth, VNA does not give caution.
> > >
> > > Best Regards
> > >
> > > Zhangkun
> > > 2003.06.20
>
> --
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