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Low phase noise PLL synthesizer

  • US 7,701,299 B2
  • Filed: 09/05/2008
  • Issued: 04/20/2010
  • Est. Priority Date: 06/16/2008
  • Status: Active Grant
First Claim
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1. A phase-locked loop frequency synthesizer comprising:

  • a phase detector;

    a low pass filter connected to the phase detector;

    an amplifier connected to the low pass filter;

    a voltage controlled oscillator (VCO) connected to the amplifier;

    a power splitter connected to the VCO; and

    ,a switch that selects either a first or a second branch that connects the power splitter to the phase detector;

    wherein,the first branch comprises a frequency divider; and

    ,the second branch comprises a mixer.

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