Feed forward amplifier for multiple frequency bands
First Claim
1. A feed forward amplifier for multiple frequency bands, having a distortion detection circuit and a distortion elimination circuit,whereinsaid 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;
whereinsaid 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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Abstract
The present invention has for its object to provide, in an environment where plural radio systems coexist, a feed forward amplifier for multiple frequency bands, capable of adaptively selecting the frequency band which is used.
The feed forward amplifier of the present invention comprises a distortion detection circuit and a distortion elimination circuit and has first and second variable frequency band extractors 25a and 25b provided in series with respective vector adjustment paths 21a and 21b. Also, the feed forward amplifier comprises a frequency band controller which varies the frequency band of variable frequency band extractors 25a and 25b and has been designed, by changing the frequency band of first and second variable frequency band extractors 25a and 25b in response to a frequency switching request from the outside, to be able to adaptively control the frequency band in which distortion is compensated.
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Citations
14 Claims
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification