Amplifiers – With plural amplifier channels – Redundant amplifier circuits
Reexamination Certificate
2006-05-30
2006-05-30
Choe, Henry (Department: 2817)
Amplifiers
With plural amplifier channels
Redundant amplifier circuits
C330S084000
Reexamination Certificate
active
07053706
ABSTRACT:
The present invention relates to bias control of a power amplification circuit of a mobile device for improving the efficiency and the linearity properties of the power amplifier. In one embodiment, the power amplifier improves these properties by receiving a voltage control signal to bias a supplemental amplifier so that the power amplifier operates in a Doherty mode in a low output power range and in a non-Doherty mode in a high output power range. In the non-Doherty mode, the supplemental amplifier is biased as a class AB amplifier via the received voltage control signal to satisfy the non-linear operational requirements of the power amplifier in the high output power range. The power amplifier generates the voltage control signal based upon power levels of signals received from a remote base station.
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Kim Jung-hyun
Kwon Youngwoo
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