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Abstract

A feed forward amplifier circuit for amplifying an input signal to produce an amplified replica thereof. A first splitter splits the input signal into first and second signal cancellation branches. The first signal cancellation branch contains an amplifier and a first 'delay, gain and phase adjuster' (DGPA) connected in series between a-first output of the first splitter and the amplifier; and, a second splitter connected in series with the amplifier's output for splitting the amplified output signal into first and second distortion cancellation branches. The second signal cancellation branch contains a first delay line connected in series between a second output of the first splitter and a first input of a first combiner. The second splitter has a first output coupled to a second input of the first combiner. The first distortion cancellation branch contains a second delay line connected in series between a second output of the second splitter and a first input of a second combiner. The second distortion cancellation branch contains a third splitter connected in series between the first combiner and a second DGPA, and an auxiliary amplifier connected in series between the second DGPA and a second input of the second combiner. A first controller is connected between an output of the third splitter and the first DGPA to adapt the first DGPA to changes in signals at the third splitter's output and to changes in signals output by the first DGPA. A second controller is connected between an output of a fourth splitter and the second DGPA to adapt the second DGPA to changes in signals at, the fourth splitter's output and to changes in signals output by the second DGPA. The fourth splitter is connected to receive the output of the second combiner and provides the amplified replica at its output.

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