Patent ID: 7429892
Filing Date: 2008-09-30
Classification: H03F

Abstract:
1. A method of processing a signal comprising: generating a digital signal; converting the digital signal to an analog signal at a first sample rate; generating an amplified analog signal having distortions; converting the amplified analog signal to a feedback digital signal at a second sample rate; and updating a model of the distortions based on the feedback digital signal, wherein the model of the distortions models the amplified analog signal at a bandwidth corresponding to the first sample rate, which is greater than the bandwidth corresponding to the second sample rate; compensating for the distortions wherein compensating for the distortions is processing the digital signal using the model to create a predicted distorted digital signal and subtracting the predicted distorted digital signal from the digital signal to create a precompensated digital signal wherein the precompensated digital signal is converted to the analog signal and wherein the distortions in the amplified analog output signal are reduced, wherein the distortions in the amplified analog output signal are reduced for frequencies higher than half the sample rate of the feedback digital signal.