A. Khanifar, Y. Buch, G. Sideris, K. Sheikh, A. Rabinovich | 2012
Abstract: A method and related systems for amplifier performance stabilization of a digitally predistorted RF power amplifier are disclosed. The characteristics of power amplifiers change as a function of temperature making adaptive digital predistortion highly problematic during initial application of an RF signal to a power amplifier. Embodiments disclose a method and systems in which the power amplifier is taken through a preparatory phase before the RF signal is applied to the power amplifier and the digital predistortion calculation starts. This is achieved by increasing the quiescent current of the power stages beyond nominal values for a rapid warm up and readjusting to its normal bias point when the radio frequency signal is applied and the digital predistortion is turned on.
