Patent ID: 9667205
Date: 2017-05-30
CPC Classifications: H03F

Claim:
1. A multimode power amplifier (PA), comprising two or more stages of amplifier circuits connected in cascade, wherein: each amplifier circuit comprises one or more basic amplifying unit array comprising a plurality of basic amplifying units connected in parallel; each basic amplifying unit comprises a capacitor, a amplifying transistor and a resistor, wherein the capacitor connects, at one end, the radio frequency (RF) signal input terminal, and at another end, a base of the amplifying transistor; the resistor connects, at one end, a bias voltage terminal, and at another end, the base of the amplifying transistor; a collector of the amplifying transistor connects a supply voltage terminal; an emitter of the amplifying transistor of each basic amplifying unit connects a reference voltage; a bias voltage of each basic amplifying unit array is controlled independently; an inductor is installed between the supply voltage terminal of the amplifier circuit of a previous stage and a RF signal input terminal of the amplifier circuit of a next stage; the supply voltage terminal of the amplifier circuit of the previous stage couples the RF signals to the RF signal input terminal of the amplifier circuit of the next stage.