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Systems, methods, and apparatus for frequency control

  • US 20070066268A1
  • Filed: 05/08/2006
  • Published: 03/22/2007
  • Est. Priority Date: 05/10/2005
  • Status: Active Grant
First Claim
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1. A receiver comprising:

  • an oscillator configured to output a frequency reference having a frequency based on an oscillator control signal;

    a first downconverter configured to receive a first local oscillator (LO) signal based on the frequency reference and to produce, according to the first LO signal, a first complex digital signal based on a first radio-frequency (RF) signal having a first carrier frequency;

    a frequency control unit configured to calculate the oscillator control signal based on the first complex digital signal; and

    a second downconverter configured to receive a second LO signal based on the frequency reference and to produce, according to the second LO signal, a second complex digital signal based on a second RF signal having a second carrier frequency different than the first carrier frequency.

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