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Radio frequency front-end circuit

  • US 10,680,556 B2
  • Filed: 11/05/2018
  • Issued: 06/09/2020
  • Est. Priority Date: 11/05/2018
  • Status: Active Grant
First Claim
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1. A radio frequency (RF) front-end circuit comprising:

  • a power management circuit configured to;

    output a first modulated voltage via a first voltage port;

    output a second modulated voltage via a second voltage port;

    output a first bias voltage via a first bias voltage port; and

    output a second bias voltage via a second bias voltage port;

    an amplifier circuit coupled to a selected voltage port among the first voltage port and the second voltage port and a selected bias voltage port among the first bias voltage port and the second bias voltage port, the amplifier circuit configured to;

    receive a selected modulated voltage and a selected bias voltage from the selected voltage port and the selected bias voltage port, respectively; and

    amplify an RF signal from an input power to an output power based on the selected modulated voltage and the selected bias voltage; and

    a control circuit coupled to the power management circuit and configured to;

    determine whether the selected bias voltage is lower than a defined bias voltage threshold; and

    cause the power management circuit to increase the selected bias voltage at the selected bias voltage port to the defined bias voltage threshold in response to the selected bias voltage being lower than the defined bias voltage threshold.

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