Apparatus and methods for reducing noise in oscillating signals
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United States of America Patent
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May 21, 2013
Grant Date -
Aug 25, 2011
app pub date -
Jul 6, 2009
filing date -
Jul 8, 2008
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Abstract
Methods and apparatus are described for reducing noise, such as phase noise, in an oscillating signal. The oscillating signal may be generated by a signal generator having a mechanical resonator, such as a crystal oscillator. A filter may be coupled to the output of the mechanical resonator and may have its center frequency adjusted using a phase-locked loop (PLL). A feedback signal from the filter to the signal generator may also be used.
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