Multimode power amplifier, multimode switching method and mobile terminal thereof

Multimode power amplifier, multimode switching method and mobile terminal thereof

  • CN 103,633,949 B
  • Filed: 08/21/2012
  • Issued: 04/03/2020
  • Est. Priority Date: 08/21/2012
  • Status: Active Grant
First Claim
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1. A multimode power amplifier, characterized by:

  • the multimode power amplifier comprises at least two stages of amplifying circuits, wherein the amplifying circuits are connected in a cascade mode;

    each stage of amplifying circuit is provided with at least one basic amplifying unit array, and the basic amplifying unit array is formed by connecting a plurality of basic amplifying units in parallel;

    each basic amplification unit comprises a capacitor, an amplification transistor and a resistor, wherein the capacitor is connected with a radio frequency signal input end on one hand and is connected with a base electrode of the amplification transistor on the other hand;

    the resistor is connected with a bias voltage port on one hand and the base electrode of the amplifying transistor on the other hand, and the collector electrode of the amplifying transistor is connected with a power supply voltage port;

    the bias voltage of each basic amplification unit array is independently controlled;

    the multimode power amplifier covers different communication systems or meets different power modes under a certain communication system by adjusting the number of the basic amplification units in the cut-off state and the conduction state and adjusting the bias voltage of the basic amplification units in the conduction state.

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