| 摘要 |
The present invention relates to a power amplifier for amplifying an electronic input signal (51) and a multi-band capable frontend with such power amplifier. The power amplifier comprises an amplifier transistor stage (1) having an input (52) and an output (53) and a feedback loop (4) placed between the output (53) and the input (52) of the amplifier transistor stage (1). The feedback loop (4) comprises a capacitor (41) and a resistive element (44) in a RF path and an inductive element (42) in a DC feed path, wherein said resistive element comprises a feedback transistor (45) arranged as variable resistor within the feedback loop, and a bias control circuit (46).
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