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Multi-band power amplification system having enhanced efficiency through elimination of band selection switch

  • US 10,177,711 B2
  • Filed: 09/29/2015
  • Issued: 01/08/2019
  • Est. Priority Date: 02/15/2015
  • Status: Active Grant
First Claim
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1. A power amplification system comprising:

  • a plurality of power amplifiers, each configured to amplify a signal in a respective frequency band; and

    an output filter coupled to each power amplifier by a separate output path, the output filter having a load impedance and the corresponding power amplifier configured to be operated at a high voltage in an average power tracking mode to provide an impedance that is approximately the same as the load impedance of the output filter, such that the power amplification system is substantially free of a band selection switch between the plurality of power amplifiers and their corresponding output filters to result in a reduction in loss by at least 0.3 dB between each power amplifier and the corresponding output filter, each output path free of an impedance transformation circuit to result in a reduction in loss by at least 0.5 dB between the corresponding power amplifier and the output filter.

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