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Down-conversion of an electromagnetic signal with feedback control

  • US 7,894,789 B2
  • Filed: 04/07/2009
  • Issued: 02/22/2011
  • Est. Priority Date: 04/16/1999
  • Status: Expired due to Fees
First Claim
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1. An apparatus for down-converting an electromagnetic signal, the apparatus comprising:

  • an energy transfer device configured to receive the electromagnetic signal and a control signal, to down-convert the electromagnetic signal based on the control signal, and to output a down-converted signal;

    an analog-to-digital (A/D) converter configured to receive the down-converted signal and to generate a down-converted digital signal;

    a state machine device configured to receive the down-converted digital signal and to compare the down-converted digital signal to a previous down-converted digital signal;

    a digital-to-analog (D/A) converter configured to output an analog voltage signal based on the comparison of the down-converted digital signal to the previous down-converted digital signal;

    a voltage controlled oscillator (VCO) configured to a generate a pulse signal based on the analog voltage signal; and

    a pulse generator configured to generate aperture pulses in the control signal based on the pulse signal, wherein the aperture pulses are an input to a switch.

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