On Fri, 17 Jan 2020 11:23:36 +0100
Magnus Danielson wrote:
> > Yes, and that's exactly the problem.
> > To expand a little bit: Noise down-folding comes to be, when
> > a signal with harmonic content passes through a non-linear element.
> > Then, this element acts as kind of a mixer on the
Hi,
On 2020-01-17 10:32, Attila Kinali wrote:
> On Thu, 16 Jan 2020 12:24:30 -0500
> Bob kb8tq wrote:
>
>>> Another trick you can employ is to pass the LO through a limiting
>>> amplifier. The idea is that the main contributor to noise in a
>>> diode ring mixer is the noise (or uncertainty) of
On Thu, 16 Jan 2020 12:24:30 -0500
Bob kb8tq wrote:
> > Another trick you can employ is to pass the LO through a limiting
> > amplifier. The idea is that the main contributor to noise in a
> > diode ring mixer is the noise (or uncertainty) of switching delay
> > of the diodes (which is not
Hi
> On Jan 16, 2020, at 10:51 AM, Attila Kinali wrote:
>
> On Thu, 12 Dec 2019 06:53:41 +0100
> Gerhard Hoffmann wrote:
>
>> It seems the mixer noise cannot be ignored.
>>
>> I wonder then why nobody takes the mixer to cross correlation land,
>> and maybe even the driver amplifier.
>
>
On Thu, 12 Dec 2019 06:53:41 +0100
Gerhard Hoffmann wrote:
> It seems the mixer noise cannot be ignored.
>
> I wonder then why nobody takes the mixer to cross correlation land,
> and maybe even the driver amplifier.
Mostly because it doesn't do as much as you think it does.
If you want to
Hi Gerhard,
On 2019-12-12 09:17, Gerhard Hoffmann wrote:
>
> Am 12.12.19 um 07:19 schrieb Bruce Griffiths:
>> Cross Correlation methods are commonly used with analog mixers.
>> Most of the high end commercial offerings use it (Holzworth, Anapico,
>> Rhohde & Schwarz, etc.)
>
>
> "High End" is a
Am 12.12.19 um 07:19 schrieb Bruce Griffiths:
Cross Correlation methods are commonly used with analog mixers.
Most of the high end commercial offerings use it (Holzworth, Anapico, Rhohde &
Schwarz, etc.)
"High End" is a contradiction to "Commonly Used" somehow.
In the published timenuts
Cross Correlation methods are commonly used with analog mixers.
Most of the high end commercial offerings use it (Holzworth, Anapico, Rhohde &
Schwarz, etc.)
Bruce
> On 12 December 2019 at 18:53 Gerhard Hoffmann
> wrote:
>
>
> It seems the mixer noise cannot be ignored.
>
>
> I wonder then
It seems the mixer noise cannot be ignored.
I wonder then why nobody takes the mixer to cross correlation land,
and maybe even the driver amplifier.
The FFT analyzer can do it anyway, a second AF pre amp costs nothing,
and other than that
there are only another mixer and 2 power
HI
For quite a while, the “quick and easy” way to do it has been to run one of the
Mini Circuits RPD parts into a > 5K load at audio. You get a nice big output
voltage
without a lot of crazy effort. Follow it with the highest voltage / lowest
noise op amp
you can find ….
Bob
> On Dec 11,
There are a number of NIST papers on this:
https://tf.nist.gov/general/publications.htm
You can also simulate the effect of a capacitive IF port load.
However a capacitive load can also degrade the isolation and RF and LO port
mismatch.
One can also use diode connected BJTs instead if lower
Hi colleagues
In parallel to my GPSDO project I am also thinking about a DMTD measurement
system which should also be capable of doing phase noise measurements. This
will be necessary to measure the stability and phase noise of my own GPSDO.
There is the paper from W. J. Riley, "A small DMTD
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