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FM demodulator for a low IF receiver

  • US 6,985,541 B1
  • Filed: 11/22/2000
  • Issued: 01/10/2006
  • Est. Priority Date: 11/23/1999
  • Status: Expired due to Term
First Claim
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1. An apparatus for receiving an input signal and outputting a recovered modulated signal, the apparatus comprising:

  • a. a superhet receiver for receiving the input signal and for outputting an in-phase signal and one or more phase shifted signals;

    b. a plurality of monostables for receiving the in-phase signal and one or more phase shifted signals, each monostable producing an output pulse;

    c. a summing circuit coupled to each of the monostable output pulses for combining the monostable output pulses into a composite waveform and outputting the composite waveform; and

    d. a filtering circuit for receiving the composite waveform, recovering a modulated signal and outputting the modulated signal.

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