For phase noise the frequency range is 1MHz to 8/26.5/50GHz
The spectrum analyzer works from 20Hz to max.
Adrian
Azelio Boriani schrieb:
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 <[email protected]> wrote:
Hi
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.
Bob
On Dec 5, 2012, at 7:03 AM, Hans Rosenberg <[email protected]> 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
carrier.
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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