Bias circuit for providing a constant bias current to a...

Details Bias circuit for providing a constant bias current to a... Bias circuit for providing a constant bias current to a...

2006-09-19

2006-09-19

Pascal, Robert (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including particular biasing arrangement

C330S289000

Reexamination Certificate

active

07109800

ABSTRACT:
A power amplifier for use in a mobile handset includes an amplifying transistor, a bias circuit including a bias transistor, the bias circuit providing a bias current to bias the amplifying transistor, and a bias current control circuit, responsive to fluctuation in a reference voltage and variation in temperature, for adjusting the bias current to control an operation current of the amplifying transistor.

REFERENCES:
patent: 6424225 (2002-07-01), Choi et al.
patent: 6452454 (2002-09-01), Shapiro et al.
patent: 6515546 (2003-02-01), Liwinski

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