Method and system for down-converting electromagnetic signals by sampling and integrating over apertures

  • US 6,266,518 B1
  • Filed: 08/18/1999
  • Issued: 07/24/2001
  • Est. Priority Date: 10/21/1998
  • Status: Expired due to Term
First Claim
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1. A method for down-converting a carrier signal to a baseband signal, comprising the steps of:

  • (1) receiving a carrier signal that includes at least one of amplitude variations, phase variations, or frequency variations at a frequency lower than a carrier frequency of the carrier signal;

    (2) sampling the carrier signal over aperture periods to transfer energy from the carrier signal at an aliasing rate, the aliasing rate determined according to a frequency of the carrier signal divided by N, wherein N indicates a harmonic or sub-harmonic of the carrier signal;

    (3) integrating the energy over the aperture periods; and

    (4) generating the baseband signal from the integrated energy.

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