Composite power amplifier
First Claim
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1. A composite amplifier having a power amplifying stage comprising an even number of power amplifiers arranged into a plurality of Chireix pairs connected to a common load, further comprisingmeans for driving at least one Chireix pair by drive signals having amplitude dependent phase over at least a part of the dynamic range of the composite amplifier;
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Abstract
A composite amplifier comprises several Chireix pairs (PA11, PA12; PA21, PA22) of power amplifiers connected to a common load. Means (21) are provided for driving each Chireix pair by drive signals having amplitude dependent phase over at least a part of the dynamic range of the composite amplifier . These parts are preferably different for different pairs.
40 Citations
23 Claims
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1. A composite amplifier having a power amplifying stage comprising an even number of power amplifiers arranged into a plurality of Chireix pairs connected to a common load, further comprising
means for driving at least one Chireix pair by drive signals having amplitude dependent phase over at least a part of the dynamic range of the composite amplifier; - and
means for driving at least two Chireix pairs in outphasing mode over different parts of the dynamic range of the composite amplifier. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method of driving a composite amplifier including a plurality of Chireix pairs of power amplifiers connected to a common load, said method including driving at least one Chireix pair by drive signals having amplitude dependent phase over at least a part of the dynamic range of the composite amplifier.
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10. A method of driving a composite amplifier including a plurality of Chireix pairs of power amplifiers connected to a common load, said method comprising
driving at least one Chireix pair by drive signals having amplitude dependent phase over at least a part of the dynamic range of the composite amplifier driving at least two Chireix pairs in outphasing mode over different parts of the dynamic range of the composite amplifier.
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14. A radio terminal comprising a power amplifying stage comprising:
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an even number of power amplifiers arranged into a plurality of Chireix pair connected to a common load; means for driving at least one Chireix pair by drive signals having amplitude dependent phase over at least a part of the dynamic range of the composite amplifier; means for driving at least two Chireix pairs in outphasing mode over different parts of the dynamic range of the composite amplifier. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23)
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Specification