If you want a low noise mixer use a varicap mixer. A varicap has no
ohmic characteristics thus
no Johnson noise.
Secondly, You can create low noise harmonics using a vaicap multiplier
or a nonlinear transmission
line using inductors and nonlinear capacitors (varicaps). NIST has been
d
Hi
Note to self - coffee first , morning emails second….
Bob
On Dec 6, 2012, at 6:39 AM, Harlan Stenn wrote:
> Karen,
>
> I still have maybe another half an hour of work to do.
>
> If I can wake up to be on the call I will. I'd say there might be a 50%
> chance I'll make it...
>
> --
> Ha
Karen,
I still have maybe another half an hour of work to do.
If I can wake up to be on the call I will. I'd say there might be a 50%
chance I'll make it...
--
Harlan Stenn
http://networktimefoundation.org - be a member!
___
time-nuts mailing list
Hi
True, but you can do a fairly simple filter to separate the 250 KHz note you
"don't want" from the 8 KHz highest frequency that you do want. There are a lot
of ADC's that will do that for you with their built in filtering.
Bob
On Dec 5, 2012, at 9:23 PM, Rick Karlquist wrote:
> Bob Camp w
time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf
Of Azelio Boriani
Sent: woensdag 5 december 2012 22:25
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Very challenging phase noise measurement, does anyone
have an idea??
Isn't th
Bob Camp wrote:
> Hi
>
> You might be surprised by the noise floor of an XOR run at 125 KHz. They
> are quite good at that low a frequency.
>
> Bob
An XOR, unlike a mixer, does not have a null when the
phases are in quadrature. This is the fundamental problem
with using it as a phase detector.
R
Hi
Digitizing two signals and winding up 170 db down is maybe a bit more
complicated than just going to quadrature and getting rid of the need to do
so…. at least for a one off application.
Bob
On Dec 5, 2012, at 9:00 PM, Jim Lux wrote:
> On 12/5/12 2:45 PM, Marek Peca wrote:
>>> This last
On 12/5/12 2:45 PM, Marek Peca wrote:
This last idea is interesting... could be simulated by Matlab or similar.
It is known to work in ordinary non-linear transistor-based mixers. It
will produce more messy spectrum than double-balanced mixer, however,
for this purpose and completely within dig
>
>>>> 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
ime and frequency measurement
> Subject: Re: [time-nuts] Very challenging phase noise measurement, does
> anyone have an idea??
>
> 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 (+7d
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 equi
This last idea is interesting... could be simulated by Matlab or similar.
It is known to work in ordinary non-linear transistor-based mixers. It
will produce more messy spectrum than double-balanced mixer, however, for
this purpose and completely within digital domain, it makes absolutely no
This last idea is interesting... could be simulated by Matlab or similar.
On Wed, Dec 5, 2012 at 11:34 PM, Marek Peca wrote:
> 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 i
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
Nearly any idea is better than the XOR gate you proposed. A simp
>> 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
Nearly any idea is better than the XOR gate you p
PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Very challenging phase noise measurement, does
anyone have an idea??
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, De
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 t
time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] 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 fre
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 t
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 wrote:
> Hi
>
> Just about any of the high speed CMOS pa
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 wrote:
> Hello Time-nuts,
>
> I have to do a phase noise
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 fro
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