Dual mode RF power amplifier

Details Dual mode RF power amplifier Dual mode RF power amplifier

2007-06-22

2009-11-03

Nguyen, Hung T. (Department: 2612)

Communications: electrical

Condition responsive indicating system

Specified power supply

C340S572100, C340S635000, C340S654000, C340S657000, C340S010100

Reexamination Certificate

active

07612684

ABSTRACT:
Briefly, in accordance with one or more embodiments, a dual mode power amplifier is capable of operating in either linear mode such as class A operation, or a non-linear mode such as class F operation. The power amplifier may be utilized in an RFID interrogator. The power amplifier may be biased to operate in a linear mode if the power amplifier is operating in a higher linearity mode, or may be biased to operate in a non-linear mode if the power amplifier is operating in a higher efficiency, lower power mode. The power amplifier may comprise two or more amplifiers coupled in parallel. A current mirror circuit may turn on more amplifiers if the power amplifier is operating in a higher power mode, and may turn on fewer amplifiers if the power amplifier is operating a lower power mode.

REFERENCES:
patent: 5550548 (1996-08-01), Schuermann
patent: 2005/0261564 (2005-11-01), Ryu et al.
patent: 2007/0236336 (2007-10-01), Borcherding
patent: 2008/0238626 (2008-10-01), Rofougaran et al.

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