[time-nuts] Very challenging phase noise measurement, does anyone have an idea??
azelio.boriani at screen.it
Wed Dec 5 21:25:10 UTC 2012
Isn't the FSUP a 110K euros equipment 20Hz-50GHz capable? 125KHz shouldn't
be a problem. I had an FSUP for 25 seconds to play with... really
impressive but too limited test time to appreciate fully.
On Wed, Dec 5, 2012 at 1:14 PM, Bob Camp <lists at rtty.us> wrote:
> Just about any of the high speed CMOS parts should work. A 74AC86 is about
> the earliest part I would trust. Any of the fast logic families that came
> after that should do equally well.
> On Dec 5, 2012, at 7:03 AM, Hans Rosenberg <Hrosenberg at catena.nl> wrote:
> > Hello Time-nuts,
> > I have to do a phase noise measurement and I'm wondering if anyone here
> has any ideas on that. We have to measure the phase noise of a 125kHz
> carrier (5Vp-p signal level). The measurement system should have a noise
> floor that is -164dBc/Hz at a distance of 1kHz to 8kHz away from the
> > Our current plan is to use 2 of these sources, have one in free running
> mode and lock the other one to the first one using an XOR gate and then use
> the output of the XOR gate as an output signal. However, we are wondering
> if any of you know a better idea. Maybe there is an off-the-shelf piece of
> equipment that can do that that we could rent. Or maybe we could increase
> the frequency to a few megahertz using a pll, which means the signal comes
> into the measurement range of our FSUP phase-noise analyzer. Problem is,
> the phase detector would then need to have an insanely low noise-floor (in
> our idea the XOR also has to have this insanely low noise floor as well off
> course) so does anyone have experience with anything like this? Does anyone
> know an XOR with these good specs? I don't have a clue what a standard
> 74lvc1g86 would do. Needless to say the supply of this XOR would have to be
> ridiculously clean, but I do have a solution for that problem.
> > Any help is greatly appreciated!
> > Best regards,
> > Hans Rosenberg
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