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Dual Threshold Demodulation in an Amplitude Modulation Radio Receiver

  • US 20090247100A1
  • Filed: 04/01/2008
  • Published: 10/01/2009
  • Est. Priority Date: 04/01/2008
  • Status: Active Grant
First Claim
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1. A radio receiver, comprising:

  • a) an amplifier configured to receive a radio frequency (RF) input signal and a gain control signal, and provide an amplified signal;

    b) a mixer, configured to combine said amplified signal and a local oscillation signal and provide a mixed output;

    c) a first threshold comparator configured to compare a baseband signal with a first comparator threshold level, and provide a first comparator output, said baseband signal being derived from said mixed output;

    d) a second threshold comparator configured to compare said baseband signal with a second comparator threshold level, and provide a second comparator output coupled to an output of said radio receiver, said second comparator threshold level being of lower magnitude than said first comparator threshold level;

    e) an automatic gain control (AGC) circuit, configured to receive said first comparator output and provide said gain control signal.

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