Dynamic bias boosting circuit for a power amplifier
First Claim
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1. A power amplifier circuit for amplifying an input signal and having a conduction angle of at least about 180°
- , said power amplifier circuit comprising an amplifying transistor and a dc bias circuit for biasing said amplifying transistor to obtain said conduction angle, and said dc bias circuit comprising a dynamic bias boosting circuit for increasing a dc bias current provided to said amplifying transistor by said dc bias circuit in direct proportion to an increase in said input signal provided to said power amplifier circuit.
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Abstract
A power amplifier circuit includes an amplifying transistor and a dc bias circuit for biasing the amplifier transistor to obtain a conduction angle of at least about 180°. The dc bias circuit includes a dynamic bias boosting circuit for increasing the dc bias current provided to the amplifying transistor by the dc bias circuit in direct proportion to an increase in the input signal provided to the power amplifier. The bias boosting circuit permits the power amplifier circuits to operate in Class B or Class AB with improved power output characteristics and reduced power dissipation at low power levels.
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5 Claims
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1. A power amplifier circuit for amplifying an input signal and having a conduction angle of at least about 180°
- , said power amplifier circuit comprising an amplifying transistor and a dc bias circuit for biasing said amplifying transistor to obtain said conduction angle, and said dc bias circuit comprising a dynamic bias boosting circuit for increasing a dc bias current provided to said amplifying transistor by said dc bias circuit in direct proportion to an increase in said input signal provided to said power amplifier circuit.
- View Dependent Claims (2, 3, 4, 5)
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