Method of enhancing power amplifier linearity

A method of enhancing power amplifier linearity, the method comprising the steps of:

• applying two distinct signal tones into a power amplifier and generating digitized output signals there from;
• observing second and third order intermodulation products associated with the digitized output signals;
• extracting coefficients associated with the second and third order intermodulation products;
• applying the extracted coefficients to an inverse non-linear function associated with the digitized output signal and generating an inverse non-linear function output signal there from;
• converting the inverse non-linear function output signal to an analog signal;
• and
• applying the analog signal into the power amplifier and generating an amplified output signal there from such that second and third order intermodulation products are substantially eliminated.

A method of enhancing power amplifier linearity, the method comprising the steps of:

• applying an input signal to a power amplifier and generating a digitized output signal there from;
• passing the digitized output signal through an inverse non-linear function signal processor and generating a feedback signal having harmonics less than fourth order there from;
• converting the feedback signal to an analog signal;
• and
• subtracting the feedback signal from the power amplifier input signal and generating an amplified output signal there from such that second and third order harmonics are substantially eliminated.

A method of enhancing power amplifier linearity, the method comprising the steps of:

• applying a two-tone input signal to a power amplifier and generating a digitized output signal there from;
• passing the digitized output signal through an inverse non-linear function signal processor and generating a feedback signal having intermodulation products less than fourth order there from;
• converting the feedback signal to an analog signal;
• and
• subtracting the feedback signal from the power amplifier input signal and generating an amplified output signal there from such that second and third order intermodulation products are substantially eliminated.