System and method for RF amplifiers
OwnerFadhel Ghannouchi, Andrew Kwan +2inventors
InventorsFadhel Ghannouchi, Andrew Kwan, Mayada Younes, Mohamed Helaoui
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Abstract
A digital predistorter comprising a first predistorter for generating out-of-band and inter-band distortion components for compensating for the static nonlinearity of a nonlinear element, and a second predistorter cascaded with the first predistorter, the second predistorter compensating for the in-band distortion of the nonlinear device wherein the cascade of the first predistorter and the second predistorter compensate for in-band, out-of-band and inter-band distortions when the cascade of the first, the second predistorter and the nonlinear element are driven with multiband signals.
Claims13
A digital predistorter comprising:
- a first predistorter coupled to receive multiple input signals, and for generating multiple output signals, the first predistorter being configured to compensate for in-band distortion signals around each one of the multiple input signal frequencies;
- a frequency distribution network for positioning the multiple output signals from the first predistorter into representative carrier frequencies to generate a multi-band signal;
- and
- a second predistorter coupled to receive the multi-band signal and output a predistorted multi-band signal, the second predistorter generating out-of-band and inter-band distortion remote to frequency bands of the multiple input signals,
- wherein the cascade of the first predistorter, the frequency distribution network, and the second predistorter compensate for in-band, out-of-band and inter-band distortions.
A method for suppressing intermodulation distortion produced by nonlinear elements in a transmission signal path comprising:
- generating a first predistorted multiple output signal from multiple input signals, the predistorted multiple output signal having in-band distortion around each one of the multiple input signals;
- positioning the predistorted multiple output signals into their representative carrier frequencies to generate a multi-band signal;
- and
- generating a second predistorted multi-band signal from the multi-band signal, the second predistorted multi-band signal including out-of-band and inter-band distortions remote to frequency bands of the multiple input signals.
Dependencies are inferred from the claim text.