Bias control circuit and method of controlling bias of RF...

Details Bias control circuit and method of controlling bias of RF... Bias control circuit and method of controlling bias of RF...

2007-02-27

2008-10-21

Nguyen, Patricia (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including gain control means

C330S296000, C330S133000, C330S288000

Reexamination Certificate

active

07439806

ABSTRACT:
A bias control circuit for an RF amplifier having an output device for providing an output signal to a load and a driver device for driving the output device includes a current mirror circuit for providing a driver device bias current to the driver device and an output device bias current to the output device. When the amplifier operates in a high power mode, the current mirror circuit supplies the driver device bias current at a level to turn on the driver device at a high current level and an output device bias current to turn on the output device. When the amplifier operates in a low power mode, the current mirror circuit supplies a driver device bias current to turn on the driver device at a reduced current level and an output device bias current to turn off the output device.

REFERENCES:
patent: 6339361 (2002-01-01), Khesbak et al.
patent: 6831517 (2004-12-01), Hedberg et al.
patent: 6937102 (2005-08-01), Lopez et al.
patent: 7157974 (2007-01-01), Grillo et al.
patent: 2007/0286609 (2007-12-01), Ikram et al.

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