| 摘要 |
An amplifier circuit ( 1 ) includes an amplifying transistor (QO) and a do bias circuit ( 2 ) for biasing the amplifier transistor (QO) to obtain a conduction angle of at least about 180°. The do bias circuit ( 2 ) includes a self-bias boosting circuit which has a Wilson current-mirror (Q 4, Q 5 , Q 6 ) integrated with a cascode current-mirror circuit (Q 2 , Q 3 ) to form an extended Wilson current-mirror circuit (Q 2 -Q 6 ) having an output coupled to a control terminal of the amplifying transistor (QO) by a resistor (R 1 ), and a capacitor (C 2 ) coupled from the extended Wilson current-mirror circuit (Q 2 -Q 6 ) to a common terminal (Gnd).
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