Patent ID: 7602240

Claim:
A power amplifier device configured for broadband operation, comprising: (a) a multiple stage power amplifier section comprising an input stage coupled with one or more subsequent stages, wherein one of the one or more subsequent stages being an output stage, and wherein the input stage and the one or more subsequent stages amplify an input signal to form an output signal, the input stage comprising: (i) a transistor having a base node, a collector node and an emitter node; (ii) a first feedback path coupled with the emitter node; (iii) a second feedback path coupled between the base node and the collector node, the second feedback path comprising a resistive element and a capacitive element; and (iv) an input node coupled with the base node, the input node for receiving an input signal to the multiple stage power amplifier, wherein the collector node is coupled with a subsequent stage of the power amplifier; and (b) an output matching network section coupled with the output stage of the power amplifier, wherein the one or more subsequent stages comprises a first subsequent stage coupled to the input stage, and a second subsequent stage coupled to the first subsequent stage, wherein the second subsequent stage is the output stage.