KONDENSATORGEKOPPELTE DYNAMISCHE VORSTROM-BOOST-SCHALTUNG FÜR EINEN LEISTUNGSVERSTÄRKER

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 tran...

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Bibliographic Details
Main Authors SOWLATI, TIRDAD, LUO, SIFEN
Format Patent
LanguageGerman
Published 29.03.2007
Subjects
AMPLIFIERS
BASIC ELECTRONIC CIRCUITRY
ELECTRICITY
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Summary: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 current in direct proportion to an increase in the input signal provided to the power amplifier. An input to the dc bias circuit is coupled to a stage of the power amplifier circuit by a capacitor. The bias boosting circuit permits the power amplifier circuits to operate in Class B or Class AB with improved linearity, improved efficiency and reduced idle current.
Bibliography:Application Number: DE20036007492T