High frequency amplifier circuit

Amplifiers – With semiconductor amplifying device – Including particular biasing arrangement

Reexamination Certificate

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Details

C330S285000

Reexamination Certificate

active

06946913

ABSTRACT:
A high-frequency amplifier has an amplifying transistor and a bias circuit that supplies a bias current to the base of the amplifier transistor. The bias circuit has a reference voltage input terminal to which a reference voltage is input from an external source, a first transistor that supplies a bias current to the base of the amplifier transistor in response to the reference voltage, a second transistor whose collector is connected to the connecting point of the first transistor to the base of the amplifying transistor, and whose emitter is grounded, a third transistor that supplies a bias current to the base of the second transistor in response to the reference voltage, and temperature compensation portions connected between the connecting point of the control input terminal to the third transistor and the grounding point.

REFERENCES:
patent: 6414553 (2002-07-01), Luo
patent: 6549076 (2003-04-01), Kuriyama
patent: 6556082 (2003-04-01), Wang et al.
patent: 6566954 (2003-05-01), Miyazawa
patent: 6690237 (2004-02-01), Miyazawa
patent: 6744321 (2004-06-01), Noh et al.
patent: 6806775 (2004-10-01), Abe
patent: 6882227 (2005-04-01), Barry et al.
patent: 2001/0054933 (2001-12-01), Miyazawa
patent: 2002-009558 (2002-11-01), None

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