Abstract: Systems and methods for controlling power amplifier (PA) performance metrics such as linearity and stability based on out-of-band feedback are presented. Various embodiments provide for synthesizing negative baseband termination using a feedback network between the drain and gate bias paths of the PA, so that the intermodulation distortion (IMD) is suppressed without an increase in system complexity. Other embodiments include a feedback network topology between the drain and gate bias paths of the PA that provides stability enhancement of the PA without the need for conventional stability networks in the radio frequency (RF) path. The out-of-band feedback nature of the approach means that the continuous wave (CW) RF performance is not perturbed, enabling conventional design techniques to be used for the input and output matching networks while enhancing aspects of the PA performance.

Abstract: Systems and methods for controlling power amplifier (PA) performance metrics such as linearity and stability based on out-of-band feedback are presented. Various embodiments provide for synthesizing negative baseband termination using a feedback network between the drain and gate bias paths of the PA, so that the intermodulation distortion (IMD) is suppressed without an increase in system complexity. Other embodiments include a feedback network topology between the drain and gate bias paths of the PA that provides stability enhancement of the PA without the need for conventional stability networks in the radio frequency (RF) path. The out-of-band feedback nature of the approach means that the continuous wave (CW) RF performance is not perturbed, enabling conventional design techniques to be used for the input and output matching networks while enhancing aspects of the PA performance.