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Linear phase demodulator including a phase locked loop with auxiliary feedback loop

  • US 3,997,848 A
  • Filed: 11/26/1975
  • Issued: 12/14/1976
  • Est. Priority Date: 11/26/1975
  • Status: Expired due to Term
First Claim
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1. Apparatus for demodulating a phase modulated wave comprising a phase locked loop responsive to the phase modulated wave, said loop including:

  • a voltage controlled oscillator, a phase detector responsive to the oscillator and the phase modulated wave for deriving an A.C. data output signal having a magnitude indicative of the phase of the phase modulated wave and a phase indicative of the phase of the modulated wave and for deriving an error signal indicative of the phase deviation between an input carrier wave component of the phase modulated wave and the voltage controlled oscillator, and a loop filter responsive to the error signal for deriving a control signal for the oscillator, means for controlling the oscillator phase in proportion to an integral of the error signal; and

    a feedback loop responsive to the data output signal for increasing the power of the carrier frequency component in the phase locked loop.

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