Amplifier circuit having an extended Wilson current-mirror self-bias boosting circuit
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United States of America Patent
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Aug 28, 2007
Grant Date -
Jul 20, 2006
app pub date -
Nov 25, 2003
filing date -
Dec 9, 2002
priority date (Note) -
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Abstract
An amplifier circuit (1) includes an amplifying transistor (QO) and a dc bias circuit (2) for biasing the amplifier transistor (QO) to obtain a conduction angle of at least about 180.degree.. The dc bias circuit (2) includes a self-bias boosting circuit which has a Wilson current-mirror (Q4, Q5, Q6) integrated with a cascode current-mirror circuit (Q2, Q3) to form an extended Wilson current-mirror circuit (Q2-Q6) having an output coupled to a control terminal of the amplifying transistor (QO) by a resistor (R1), and a capacitor (C2) coupled from the extended Wilson current-mirror circuit (Q2-Q6) to a common terminal (Gnd).
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