RF amplifier with a bias boosting scheme

Amplifiers – With semiconductor amplifying device – Including particular biasing arrangement

Reexamination Certificate

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C330S285000, C330S288000

Reexamination Certificate

active

07365604

ABSTRACT:
The present invention provides methods and apparatuses for an amplifier circuit for amplifying an input signal. An amplifier circuit for amplifying an input signal comprises an amplifying transistor circuit having a power transistor and a dc bias circuit having a plurality of current mirror circuits and a discharge transistor wherein the discharge transistor and the power transistor form a combined current mirror circuit to control quiescent current in the power transistor.

REFERENCES:
patent: 5548248 (1996-08-01), Wang
patent: 5808511 (1998-09-01), Kobayashi
patent: 6414553 (2002-07-01), Luo
patent: 6486739 (2002-11-01), Luo
patent: 6492874 (2002-12-01), Shih
patent: 6784743 (2004-08-01), Taniguchi et al.
patent: 6922107 (2005-07-01), Green
patent: 7224230 (2007-05-01), Apel et al.

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