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Injection-locked phase-locked loop with a self-aligned injection window

  • US 8,432,198 B2
  • Filed: 09/02/2011
  • Issued: 04/30/2013
  • Est. Priority Date: 09/10/2010
  • Status: Active Grant
First Claim
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1. An injection-locked phase-locked loop with a self-aligned injection window, comprising:

  • a loop filter, providing a control voltage;

    an injection pulse generator, generating an injection pulse based on a reference oscillation signal;

    an injection-locked voltage-controlled oscillator, controlled by the control voltage and the injection pulse, and having a pair of differential terminals for generation of an oscillation output, wherein the control voltage is operative to adjust a frequency and/or a phase of the oscillation output, and the oscillation output is aligned with the injection pulse to limit a phase difference between the oscillation output and the injection pulse; and

    a phase detector, coupled to the pair of differential terminals of the injection-locked voltage-controlled oscillator to detect, according to the injection pulse, a phase difference between signals on the pair of differential terminals and thereby generate a control signal, wherein the control signal is operative to further adjust the phase difference between the oscillation output and the injection pulse.

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