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Amplification in presence of a variable antenna impedance

  • US 10,608,598 B2
  • Filed: 06/28/2018
  • Issued: 03/31/2020
  • Est. Priority Date: 06/28/2018
  • Status: Active Grant
First Claim
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1. An apparatus comprising:

  • a balanced power amplifier including;

    a first power amplifying path and a second power amplifying path, the first power amplifying path including a first power amplifier, the second power amplifying path including a second power amplifier;

    a quadrature output power combiner having an input port, a coupled port, and an isolated port, the input port and the coupled port respectively coupled to the first power amplifying path and the second power amplifying path;

    detection circuitry including at least one power detector and a resistor, the resistor coupled between the isolated port and a ground, the at least one power detector coupled to the isolated port, the at least one power detector configured to measure power at the isolated port, the power based on a resistance of the resistor; and

    control circuitry coupled to the first power amplifying path, the second power amplifying path, and the detection circuitry, the control circuitry configured to adjust operating conditions of the first power amplifier and the second power amplifier based on the power that is measured at the isolated port.

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