Method and system for down-converting an electromagnetic signal, and transforms for same, and aperture relationships

  • US 8,660,513 B2
  • Filed: 07/13/2012
  • Issued: 02/25/2014
  • Est. Priority Date: 10/21/1998
  • Status: Expired due to Term
First Claim
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1. A system for frequency down-converting a modulated carrier signal, comprising:

  • a first switch, a first control signal which comprises a sampling aperture with a specified frequency, and a first energy storage element that down-converts said modulated carrier signal according to said first control signal and outputs a down-converted in-phase signal portion of said modulated carrier signal;

    a second switch, a second control signal which comprises a sampling aperture with a specified frequency, and a second energy storage element that down-converts said modulated carrier signal according to said second control signal and outputs a down-converted inverted in-phase signal portion of said modulated carrier signal;

    the first and second control signals each controlling a charging and discharging cycle of their respective energy storage element by controlling the first and second switching devices so that for each switching device a portion of energy is transferred from the modulated carrier signal to the respective energy storage element during a charging part of the cycle and a portion of the transferred energy is discharged during a discharging part of the cycle for each respective switching device, and each said control signal operating at an aliasing rate selected so that energy of the modulated carrier signal is sampled and differentially applied to the respective energy storage element at the frequency of the respective control signal'"'"'s aperture, and each respective energy storage element generating, respectively, said differential down-converted in-phase signal portion and said down-converted inverted in-phase signal portion of said modulated carrier signal from the alternate charging and discharging applied to the respective energy storage element differentially applied by each respective switching device using said respective first or second control signal; and

    a first differential amplifier circuit that combines said down-converted in-phase signal portion with said inverted in-phase signal portion and outputs a first channel down-converted differential in-phase signal.

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