Patent ID: 6816015
Filing Date: 2004-11-09
Classification: H03F

Abstract:
An improved bipolar transistor power amplifier circuit comprising:a bias input node; an RF input node; an RF output node; a plurality of HBTs each including: a base, an emitter, a collector, a base resistor connected to the base and selected to offset a portion of the voltage drop across the base and emitter of each transistor, an emitter resistor connected to the emitter, and a base capacitor having two electrodes one of which is coupled to the base; the HBTs grouped together in two or more group each group including: a second base resistor selected to offset another portion of the voltage drop across said base and emitter of the transistors; the second base resistors coupled to the bias input node; the collectors of each HBT coupled to the RF output node; and the other electrode of each base capacitor coupled to the RF input node.