Patent ID: 8706062
Filing Date: 2014-04-22
Classification: H03F

Abstract:
1. A mixed-signal adaptive integrated circuit receiving an RF input signal and coupled to a power amplifier, comprising: a first pre-distortion circuit operable to receive the RF input signal and to add a first pre-distortion signal to the RF input signal to thereby provide a first pre-distorted RF input signal which is provided to the power amplifier to provide the amplified RF output signal; a compensation module operable to receive the RF input signal and to provide a compensation signal, wherein the compensation module is coupled to an auxiliary amplifier which receives the compensation signal and is operable to amplify the compensation signal, to selectively add the amplified compensation signal to the amplified RF output signal when a burst pulse appears in the amplified RF output signal, and to provide a compensated output signal; and a signal analyzer operable to process the RF input signal and the compensated output signal to generate, based on an error signal derived from digitally delay-matching the RF input signal and the compensated output signal, a first digital control signal for the first pre-distortion circuit, and a second digital control signal for the compensation module, wherein the first digital control signal provides a group of coefficients for a polynomial function of an envelope of the RF input signal.