[time-nuts] sysclock source for AD9912 DDS?

Mike M timenuts at binsamp.e4ward.com
Mon Dec 30 21:54:48 UTC 2013


From: Said Jackson

  > Today I would not use a simple (cheap) 1GHz VCO anymore because of
  > the relatively  high phase noise, and some if them  require  up to
  > 20V drive voltage. I would use a Crystal based product such as our
  > ULN-1G 1GHz crystal oscillator. That part may be overkill since it
  > has DC-DC  regulators,  filters,   mil-temp  range,  and  a +22dBm
  > temp-stabilized output  amplifier, but its  a  drop-in replacement
  > for a  VCO.  With  that part, the  loop  filter  bandwidth  can be
  > reduced to a couple 100Hz to take advantage of the very low  PN of
  > the oscillator.

Said, can you give the url for your ULN-1G 1GHz crystal oscillator? I'm
interested in price and phase noise and how it compares to the Wenzel
products.

Thanks,
Mike



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