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

  • US 7,539,474 B2
  • Filed: 02/17/2005
  • Issued: 05/26/2009
  • Est. Priority Date: 04/16/1999
  • Status: Active Grant
First Claim
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1. An apparatus for down-converting an input signal, comprising:

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

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

    a combining module that combines the second down-converted signal with the first down-converted signal and outputs a single channel down-converted signal;

    wherein the first frequency down-conversion module comprises a first switch and a first storage element, wherein the first switch is coupled to the first storage element at a first node and coupled to a first reference potential; and

    wherein the second frequency down-conversion module comprises a second switch and a second storage element, wherein the second switch is coupled to the second storage element at a second node and coupled to a second reference potential.

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