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Injection locking using direct digital tuning

  • US 6,963,249 B2
  • Filed: 08/12/2003
  • Issued: 11/08/2005
  • Est. Priority Date: 08/12/2002
  • Status: Expired due to Term
First Claim
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1. A method of digitally pre-tuning and injection locking a voltage controlled oscillator (VCO) having an output of a specified frequency, said method comprising the steps of:

  • (a) digitally pre-tuning said VCO to within a specified locking bandwidth (LBW);

    (b) injecting an input reference signal into said VCO; and

    (c) locking said VCO to said input reference signal, wherein the step of digitally pre-tuning comprises the steps of;

    (i) digitizing said VCO output;

    (ii) determining said VCO output frequency;

    (iii) adjusting said VCO output frequency; and

    (iv) repeating steps (a) to (c) until a desired oscillation frequency is reached.

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