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Feed forward amplifier for multiple frequency bands

  • US 20060273853A1
  • Filed: 06/02/2006
  • Published: 12/07/2006
  • Est. Priority Date: 06/03/2005
  • Status: Active Grant
First Claim
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1. A feed forward amplifier for multiple frequency bands, having a distortion detection circuit and a distortion elimination circuit, wherein said distortion detection circuit comprises:

  • a first linear signal path constituted by a first delay means;

    N first vector adjustment paths;

    a first dividing part dividing an input signal into said first linear signal path and said N first vector adjustment paths;

    N first variable frequency band extractors provided respectively for each said first vector adjustment path, and extracting signals of mutually discrete frequency bands;

    N first vector adjusters provided respectively for each said first vector adjustment path, and adjusting the phase and the amplitude thereof;

    a first multiple frequency band amplifying part amplifying the output of each first vector adjuster of said first vector adjustment paths; and

    a combiner/divider outputting the additive component and the differential component of the output of said first linear signal path and the output of said first multiple frequency band amplifying part;

    wherein said distortion elimination circuit comprises;

    a second linear signal path, constituted by a second delay means, into which said additive component is input;

    N second vector adjustment paths into which said differential component is input;

    N second variable frequency band extractors, respectively provided for each said second vector adjustment path, extracting the signals of respectively the same frequency bands as said N first variable frequency band extractors;

    N second vector adjusters, respectively provided for each said second vector adjustment path, and adjusting the phase and the amplitude thereof;

    a second multiple frequency band amplifying part amplifying the outputs of the second vector adjusters of said second vector adjustment paths; and

    a second combining part combining and outputting the output of said second linear signal path and the output of said second multiple frequency band amplifying part;

    N being an integer equal to or greater than 2;

    and comprising;

    a frequency band controller controlling said N first variable-frequency band extractors and said N second variable frequency band extractors.

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