You can always use an external mixer / phase detector and the baseband
input of a HP 3048A or FSUP.
Just to name a few:
For low power (+7dBm) you can use a SRA-3 which goes from 25kHz to 200MHz
SRA-3MH +13dBm from 25kHz to 200MHz
SRA-3H +17dBm from 50kHz to 200MHz
For high power signals use a RAY-3. It goes from 70kHz to 200MHz.
The IF must be specified from DC, which for the above is the case.
Between mixer and baseband input a lowpass filter is required to
suppress the sum signal (2x f_input) sufficiently.
Adrian
Azelio Boriani schrieb:
Yes, I have taken a look and the FSUP is 1MHz min at the signal analyzer.
Timepod? No, 500KHz min... an R&S FAM modulation analyzer?
On Wed, Dec 5, 2012 at 10:48 PM, Bob Camp <[email protected]> wrote:
Hi
A "3048" style measurement with the carrier suppressed by lock should do
pretty well. If the XOR's are out, there are a lot of mixers available that
work at 125 KHz. A simple op-amp buffer and a sound card could do what you
need to do.
Bob
-----Original Message-----
From: [email protected] [mailto:[email protected]] On
Behalf Of Adrian
Sent: Wednesday, December 05, 2012 4:33 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Very challenging phase noise measurement, does
anyone have an idea??
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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