| 摘要 |
An amplifier circuit comprises a main stage amplifier connected between a RF input and a RF output and at least one secondary stage amplifier, which is connected in parallel to the main stage amplifier between the RF input and the RF output. The secondary stage amplifier comprises an input bipolar transistor, whose collector terminal or emitter terminal is high frequency-coupled to the RF input. The secondary stage amplifier further comprises an output bipolar transistor, whose base terminal is high frequency-coupled to the base terminal of the input bipolar transistor and whose collector terminal or emitter terminal is high frequency-coupled to the RF output. The output bipolar transistor is further coupled to a supply voltage terminal.
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