Amplifier circuit having an extended Wilson current-mirror...

Details Amplifier circuit having an extended Wilson current-mirror... Amplifier circuit having an extended Wilson current-mirror...

2007-08-28

2007-08-28

Mottola, Steven J. (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including particular biasing arrangement

Reexamination Certificate

active

10537592

ABSTRACT:
An amplifier circuit (1) includes an amplifying transistor (QØ) and a dc bias circuit (2) for biasing the amplifier transistor (QØ) to obtain a conduction angle of at least about 180°. 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 (QØ) by a resistor (R1), and a capacitor (C2) coupled from the extended Wilson current-mirror circuit (Q2-Q6) to a common terminal (Gnd).

REFERENCES:
patent: 5548248 (1996-08-01), Wang
patent: 5844443 (1998-12-01), Wong
patent: 6064268 (2000-05-01), Felps
patent: 6300837 (2001-10-01), Sowlati
patent: 6358516 (2002-03-01), Harod
patent: 6414553 (2002-07-01), Luo
patent: 6486739 (2002-11-01), Luo
patent: 6492875 (2002-12-01), Luo

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