| 摘要 |
<p>A power amplifier circuit (1) includes an amplifying transistor (10) and a dc bias circuit for biasing the amplifier transistor to obtain a conduction angle of at least about 180°. The dc bias circuit (2) includes a self-bias boosting circuit for initially decreasing and then increasing the dc bias voltage provided to a control terminal of the amplifying transistor (10) by the dc bias circuit (2) as the input signal provided to the power amplifier increases. The self-bias boosting circuit is extremely simple and compact in design, and permits the power amplifier circuit (1) to operate in Class B or Class AB with improved power output characteristics.</p> |
