Feedforward amplifier and control method thereof

Details Feedforward amplifier and control method thereof Feedforward amplifier and control method thereof

2011-03-08

2011-03-08

Pascal, Robert (Department: 2817)

Amplifiers

With amplifier bypass means

Reexamination Certificate

active

07902922

ABSTRACT:
In a feedforward amplifier (200) including a signal cancellation circuit (10) and a distortion eliminating circuit (20), a harmonic reaction amplifier (130) is used as a main amplifier of the signal cancellation circuit. A controller (43) obtains an adjacent channel leakage power ratio (ACLR) and a power efficiency from an output of the feedforward amplifier (200) and controls the gate bias voltages of two transistors (33A and33B) of the harmonic reaction amplifier (130) to maximize the power efficiency under the condition that the ACLR is less than or equal to a reference value.

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