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US 11,394,412 B2Granted
Predistortion circuit, method for generating a predistorted baseband signal, control circuit for a predistortion circuit, method to determine parameters for a predistortion circuit, and apparatus and method for predistorting a baseband signal
AssigneeApple Inc.
InventorsAndreas Menkhoff, Gunther Kraut, Andreas Langer
Life of this patent
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Abstract
A predistortion circuit for a wireless transmitter includes a signal input configured to receive a baseband signal. Further, the predistortion circuit includes a predistorter configured to generate a predistorted baseband signal using the baseband signal and a select of one of a first predistorter configuration and a second predistorter configuration.
Claims20
A predistortion circuit for a wireless transmitter, the predistortion circuit comprising:
- a signal input configured to receive a baseband signal;
- and
- a predistorter comprising a plurality of predistortion sub-circuits, each predistortion sub-circuit configured to perform corresponding predistortion computations, the predistorter configured to generate a predistorted baseband signal using the baseband signal and a predistorter configuration, wherein the predistorter configuration is selected from among a first predistorter configuration and a second predistorter configuration by selectively activating a corresponding unique combination of predistortion sub-circuits based at least on which one of an Average Power Tracking Mode and an Envelope Tracking mode is a current operating mode of a power amplifier of the wireless transmitter.
A method for generating a predistorted baseband signal for a wireless transmitter, the method comprising:
- selecting a predistorter configuration from among a first predistorter configuration and a second predistorter configuration by selectively activating a corresponding unique combination of predistortion sub-circuits from a plurality of predistortion sub-circuits based at least on which one of an Average Power Tracking Mode and an Envelope Tracking mode is a current operating mode of a power amplifier of the wireless transmitter, wherein each predistortion sub-circuit performs corresponding predistortion computations;
- and
- generating the predistorted baseband signal using a baseband signal and the selected predistorter configuration.
Dependencies are inferred from the claim text.