Amplifiers – With semiconductor amplifying device – Including particular biasing arrangement
Reexamination Certificate
2006-06-20
2006-06-20
Mottola, Steven J. (Department: 2817)
Amplifiers
With semiconductor amplifying device
Including particular biasing arrangement
C330S288000
Reexamination Certificate
active
07064614
ABSTRACT:
An electronic circuit includes a current mirror bias circuit and a power amplifier that has a power transistor for amplifying radio frequency signals such that the output collector current of the power transistor is approximately constant over a wide range of varying power supply voltages. The power transistor is biased by a current mirror biasing circuit that has a reference voltage that maintains the quiescent DC collector current at an approximately constant value. The reference voltage may be varied to provide control of the output power of the power amplifier.
REFERENCES:
patent: 6437647 (2002-08-01), Fowler
patent: 6452456 (2002-09-01), Gharpurey et al.
patent: 6750721 (2004-06-01), Patterson
Caruth David Charles
Feng Jeffrey T.
Brinks Hofer Gilson & Lione
Mottola Steven J.
Xindium Technologies, Inc.
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