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Direct digital synthesis of precise, stable angle modulated RF signal

  • US 5,952,895 A
  • Filed: 02/23/1998
  • Issued: 09/14/1999
  • Est. Priority Date: 02/23/1998
  • Status: Expired due to Term
First Claim
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1. An RF modulator comprising:

  • a phase lock loop including a loop filter and receiving as an input signal a baseband modulation signal and producing as an output signal a modulated RF signal;

    circuitry for producing an injection modulation signal;

    circuitry for injecting the injection modulation signal into the phase lock loop at a point past the loop filter; and

    control circuitry, coupled to the circuitry for injecting the injection modulation signal, for controlling the amplitude of the injection modulation signal.

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