-Message d'origine-
De : time-nuts [mailto:time-nuts-boun...@febo.com] De la part de Bruce Griffiths
Envoyé : lundi 22 décembre 2014 20:30
À : Discussion of precise time and frequency measurement
Objet : Re: [time-nuts] LNA and Alias
On Monday, December 22, 2014 09:26:15 AM Loïc wrote
Hi
The nature of a ADC with a built in digital front end filter is to have
multiple passbands centered around the ADC clock and it’s harmonics. Put
another way - the chip has zero rejection at clock * N where N = 1,2,3,4,5….
They may also have zero rejection at other frequencies (like clock /
Are you sure that the setup is aligned to minimise AM response?
Are you using cross-correlation?
Bruce
On Monday, 22 December 2014 5:08 PM, Loïc Moreau loic.mor...@eai..fr
wrote:
Hi all,
My phase noise measurements system give erroneous results in close in phase
noise
Bruce Griffiths bruce.griffiths@... writes:
Are you sure that the setup is aligned to minimise AM response?
Are you using cross-correlation?
Bruce
On Monday, 22 December 2014 5:08 PM, Loïc Moreau loic.moreau at
eai..fr wrote:
Hi all,
My phase noise measurements system
Hi
At the moment Comcast and ko4bb.com don’t seem to like each other. I can’t
refer directly to the schematic or the page.
What you *should* have (assuming 10 MHz inputs for clarity):
1) The RF inputs go into the mixer from what ever sources you happen to want to
test. At least one source
Loic,
If you have a single-pole low-pass filter at say 20 kHz you will have a
60 dB damping as you hit 20 MHz. No reason to get really fancy.
Either just do a two-pole low-pass filter (inductance, capacitance) or a
two-stage RC-link, or consider doing a LC-series link between signal and
On Monday, December 22, 2014 09:26:15 AM Loïc wrote:
Bruce Griffiths bruce.griffiths@... writes:
Are you sure that the setup is aligned to minimise AM response?
Are you using cross-correlation?
Bruce
On Monday, 22 December 2014 5:08 PM, Loïc Moreau loic.moreau
at
eai..fr
Bob,
It may not have been Comcast. I had issues (cockpit error on my part) with
the server this morning around the time you wrote your message. It should
be OK now.
However, the new setup is making it more difficult to attach links to
documents because when you click on a document in the Manuals
Hi all,
My phase noise measurements system give erroneous results in close in phase
noise measurements, I got humps in the 1Hz-1000Hz area as high à 20 dB more
than expected.
The setup is using a mixer to compare reference and DUT witch drive an LNA
