Hi My -
I think you already had a good idea when you tried to check the
2500 MHz sample clock generator.
At the moment I can't remember the details of the 2500MHz clock
generator. But, I'd guess that it is programmable and if it is
then one test could be to program it to some frequency under
your o-scope's 200MHz limit and see if anything appears.
Such a frequency is much too low for the ASIAA_ADC but it would
give some indication if the clock generator works at all.
It's not unusual for signal generators to have a separate output
on/off button that is independent of the frequency and amplitude settings.
That output button has tripped me up in the past.
Even if you can get the clock generator to work at a low MHz
compatible with the o-scope that doesn't mean it will work at
the ADC's frequency. But if it did work that might help us
identify what is going on.
Can you please remind me of the part numbers for the 10MHz and
ADC sample clock signal generators so I can read their datasheets?
Do you have a laptop w/ camera you could bring to the ADC test bed ?
If so, we could schedule a zoom debug session.
If we can't get things working with a bit of remote debugging I can
visit Digicom w/ a spectrum analyzer and high BW o-scope.
I'll look around the lab to see if I can identify a replacement sample
clock generator should that be necessary.
Matt
On Fri, 12 Nov 2021, My Nguyen wrote:
Date: Fri, 12 Nov 2021 10:32:23 -0800
From: My Nguyen <[email protected]>
To: Matt Dexter <[email protected]>, [email protected]
Cc: Mo Ohady <[email protected]>
Subject: Test fixture
Hi Matt,
I hope you are well and safe.
We have an issue with the ASIA_ADC test fixtures and wonder why. We've tested
more than
100 boards a few months ago and all passed the test. Now it does not have
signal and have
an error message (see attached documents). I've tried everything to find out
what is the
root cause but no luck (retested the PCBA that passed before; changed the
Coaxial cable
from Frequency Synthesizer to Signal Generator; measured 10 MHz at CN1
connector on the
board). I could not check the 25000 MHz at the Frequency Synthesizer output or
at CN7
connector on the board because our Oscilloscope is not capable (up to 200 MHz only).
Sorry for any inconvenience but you are the only contact person for the UC
Berkeley
project now.
Thanks and best regards.
MY NGUYEN
Digicom Electronics Inc.
7799 Pardee Lane, Oakland, CA 94621.Website: www.Digicom.org.
Direct Line : (510) 668-8443
Main line : (510) 639-7003
Email: [email protected]
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