Patent ID: 8615207

Claim:
A system for improving linearity of a power amplifier, comprising: a first input operable to couple to an input signal path of the power amplifier for obtaining a first sample of an input signal of the power amplifier; a second input operable to couple to an output signal path of the power amplifier for obtaining a second sample of an output signal of the power amplifier, the output signal comprising at least one non-linearity component imposed on the output signal by the power amplifier, the second sample comprising at least one sampled non-linearity component corresponding to the at least one non-linearity component; an output operable to couple to the input signal path of the power amplifier, the output for applying a linearity improving signal to the input signal path; and a linearizer electrically coupled to the first input, the second input, and the output, the linearizer comprising: a first signal canceller for receiving the first sample from the first input and the second sample from the second input and deducting the first sample from the second sample to produce an intermediate signal comprising the at least one sampled non-linearity component; and a second signal canceller coupled between the first signal canceller and the output, the second signal canceller operable to produce the linearity improving signal by adjusting at least one of amplitude, phase, and delay of the at least one sampled non-linearity component of the intermediate signal, the linearity improving signal operable to reduce an intensity of the at least one non-linearity component in response to being coupled to the input signal path and amplified by the power amplifier.