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Method and system for down-converting an electromagnetic signal

  • US 9,350,591 B2
  • Filed: 03/05/2015
  • Issued: 05/24/2016
  • Est. Priority Date: 10/21/1998
  • Status: Expired due to Fees
First Claim
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1. A method for frequency down-converting a modulated carrier signal to a demodulated baseband signal, comprising:

  • transferring to an output of a first switch a first portion of energy from the modulated carrier signal during a sampling aperture with a specified frequency of a first control signal that controls when the first switch is on and when the first switch is off;

    storing at a first storage device the first portion of transferred energy from the modulated carrier signal output by the first switch when the first switch is on, the first storage device having previously accumulated energy from the modulated carrier signal as a first accumulation of energy, the first portion of energy being added to the first accumulation of energy to result in a second accumulation of energy, discharging at least some of the second accumulation of energy when the first switch is off so as to leave a third accumulation of energy which results from an undischarged portion of the second accumulation of energy at the first storage device, and outputting a down-converted in-phase baseband signal portion of said modulated carrier signal derived from the energy stored at the first storage device while the storing and the discharging occurs;

    transferring to an output of a second switch a second portion of energy from the modulated carrier signal during a sampling aperture with a specified frequency of a second control signal that controls when the second switch is on and when the second switch is off;

    storing at a second storage device the second portion of transferred energy from the modulated carrier signal output by the second switch when the second switch is on, the second storage device having previously accumulated energy from the modulated carrier signal as a fourth accumulation of energy, the second portion of energy being added to the fourth accumulation of energy to result in a fifth accumulation of energy, discharging at least some of the fifth accumulation of energy when the second switch is off so as to leave a sixth accumulation of energy stored at the second storage device, and outputting a down-converted inverted in-phase baseband signal portion of said modulated carrier signal derived from the energy stored at the second storage device while the storing and the discharging occurs;

    wherein said down-converted in-phase baseband signal portion is generated from both said second accumulation of energy and said third accumulation of energy;

    wherein said down-converted inverted in-phase baseband signal portion is generated from both said fifth accumulation of energy and said sixth accumulation of energy; and

    combining with a first differential amplifier circuit said down-converted in-phase baseband signal portion with said down-converted inverted in-phase baseband signal portion and outputting to a channel a down-converted differential in-phase baseband signal based on said down-converted in-phase baseband signal portion and said down-converted inverted in-phase baseband signal portion.

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