Low-noise source
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United States of America Patent
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Sep 6, 2011
Grant Date -
Feb 25, 2010
app pub date -
Oct 30, 2009
filing date -
May 20, 2005
priority date (Note) -
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Abstract
In one embodiment, a low-noise source includes: a signal source; a variable amplifier adapted to amplify an output signal from the signal source to provide an amplified signal; a feed-forward amplifier adapted to amplify the amplified signal to provide an amplified output signal; a phase noise measurement system adapted to provide a first feedback signal responsive to phase noise in the amplified output signal; and a processor adapted to control the amplification provided by the variable amplifier responsive to the feedback signal so as to minimize phase noise in the amplified output signal.
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