Power amplifier bias circuit having controllable current...

Details Power amplifier bias circuit having controllable current... Power amplifier bias circuit having controllable current...

2011-01-25

2011-01-25

Choe, Henry K (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including gain control means

C330S296000

Reexamination Certificate

active

07876157

ABSTRACT:
A power amplifier bias circuit having a controllable current profile includes a first transistor device configured as a switch, and configured to receive a non-regulated system voltage, and a plurality of resistors configured to provide a current and configured to determine an amount of a bias current that flows through a second transistor device, where the second transistor device is part of a current mirror comprising a third transistor device and the amount of bias current flowing through the second transistor device determines a power output of the third transistor device.

REFERENCES:
patent: 6819185 (2004-11-01), Jensen
patent: 6992524 (2006-01-01), Yang et al.
patent: 7262666 (2007-08-01), Luo
patent: 7332968 (2008-02-01), Luo
patent: 7355480 (2008-04-01), Honda
patent: 7365604 (2008-04-01), Luo et al.

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