DC offset, re-radiation, and I/Q solutions using universal frequency translation technology

  • US 6,879,817 B1
  • Filed: 03/14/2000
  • Issued: 04/12/2005
  • Est. Priority Date: 04/16/1999
  • Status: Expired due to Term
First Claim
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1. An apparatus for down-converting an electromagnetic signal, comprising:

  • a first frequency down-conversion module that receives an input signal, wherein said first frequency down-conversion module down-converts said input signal according to a first control signal and outputs a first down-converted signal;

    a second frequency down-conversion module that receives said input signal, wherein said second frequency down-conversion module down-converts said input signal according to a second control signal and outputs a second down-converted signal;

    a first subtractor module that subtracts said second down-converted signal from said first down-converted signal and outputs a channel down-converted signal;

    a third frequency down-conversion module that receives said input signal, wherein said third frequency down-conversion module down-converts said input signal according to a third control signal and outputs a third down-converted signal;

    a fourth frequency down-conversion module that receives said input signal, wherein said fourth frequency down-conversion module down-converts said input signal according to a fourth control signal and outputs a fourth down-converted signal; and

    a second subtractor module that subtracts said fourth down-converted signal from said third down-converted signal and outputs a second channel down-converted signal;

    wherein said input signal comprises an I/Q modulated signal;

    wherein said first channel down-converted signal comprises an I-phase information signal portion of said I/Q modulated signal, and wherein said second channel down-converted signal comprises a Q-phase information signal portion of said I/Q modulated signal; and

    wherein said first universal frequency down-conversion module under-samples said input signal according to said first control signal, and said second universal frequency down-conversion module under-samples said input signal according to said second control signal.

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