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Logarithmic detector amplifier system for use as high sensitivity selective receiver without frequency conversion

  • US 9,590,572 B2
  • Filed: 03/17/2014
  • Issued: 03/07/2017
  • Est. Priority Date: 09/12/2013
  • Status: Active Grant
First Claim
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1. A system for use in a receive chain of a communication device, the system comprising:

  • a logarithmic amplifying circuit configured to receive an input signal at an input of the system having a first frequency and to generate an oscillation based on the input signal;

    a sampling circuit coupled to the logarithmic amplifying circuit and configured to;

    compare an input signal magnitude of the input signal with a predetermined input signal magnitude threshold; and

    terminate the oscillation when the input signal magnitude is equal to or greater than the predetermined input signal magnitude threshold so as to periodically clamp and restart the oscillation to generate a series of voltage spikes;

    a first resonant circuit coupled to the logarithmic amplifying circuit and configured to establish a frequency of operation of the system; and

    a second resonant circuit coupled to at least one of the first resonant circuit or the logarithmic amplifying circuit and configured to generate an output signal at an output of the system having a second frequency, the second frequency being substantially the same as the first frequency, wherein the output signal is generated without frequency conversion of the input signal.

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