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Linear wideband phase modulation system

  • US 7,675,379 B1
  • Filed: 03/06/2006
  • Issued: 03/09/2010
  • Est. Priority Date: 03/05/2005
  • Status: Active Grant
First Claim
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1. Apparatus for linear phase modulation utilizing a phase-locked loop, the apparatus comprising:

  • a digital limiting circuit that restricts a range of a modulation signal that is coupled to a voltage controlled oscillator (VCO) associated with the phase-locked loop; and

    a linearizing circuit that reshapes the modulation signal to improve linearity;

    wherein the digital limiting circuit comprises a circuit disposed to;

    receive a set of digital samples representative of the FM value of the modulation signal;

    determine if the value of a first sample of the set of digital samples exceeds a predefined threshold; and

    responsive to said determining, adjust the values of the first sample and a second sample of the set of digital samples.

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