Patent ID: 6433641
Filing Date: 2002-08-13
Classification: H03F

Abstract:
A power amplifier, comprising:a power amplification element including a first bipolar transistor of a common-emitter type; a voltage supply circuit for supplying a base of said first bipolar transistor with a bias voltage; and a distortion compensation circuit for compensating for distortion of said power amplification element, said distortion compensation circuit including: a variable impedance element provided between said voltage supply circuit and the base of said first bipolar transistor, and an adjustment circuit which compensates for said distortion of said power amplification element by adjusting a value of at least one of a reactance component and a resistance components wherein said variable impedance element is formed of a second bipolar transistor having an emitter connected to the base of said first bipolar transistor, a base connected to said voltage supply circuit, and a collector connected to a node for connecting said adjustment circuit.