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Active polyphase inverter filter for quadrature signal generation

  • US 20030227983A1
  • Filed: 06/04/2003
  • Published: 12/11/2003
  • Est. Priority Date: 06/07/2002
  • Status: Active Grant
First Claim
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1. A quadrature signal generator, comprising:

  • a coarse stage for generating output signals that have substantially a quadrature phase relationship, said coarse stage having at least one 90/180 delay circuit having a first set of inverters and a second set of inverters, said second set of inverters having an approximate delay of 90 degrees relative to said first set of inverters; and

    at least one refinement stage for refining said quadrature phase relationship of said output signals from said coarse stage, said refinement stage having at least one 0/180 delay circuit, said 0/180 delay circuit having a third series of inverters and a fourth series of inverters, said fourth series of inverters having an approximate delay of 180 degrees relative to said third series of inverters.

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