Method of and circuit for predistortion for a cable TV amplifier
AssigneeXilinx, Inc.
InventorsHongzhi Zhao, Christopher H. Dick, Xiaohan Chen, Hemang M. Parekh
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Abstract
A digital predistortion (DPD) system includes an input configured to receive a DPD input signal. In some examples, a non-linear datapath is coupled to the input, where the non-linear datapath is configured to add a non-linear mirror image component to the DPD input signal to provide a non-linear signal that is used to generate a first predistortion signal. In some embodiments, a linear datapath is coupled to the input in parallel with the non-linear datapath to generate a second predistortion signal. A first combiner is configured to combine the first predistortion signal and the second predistortion signal to generate a DPD output signal.
Claims20
A digital predistortion (DPD) system, comprising:
- an input configured to receive a DPD input signal;
- a first non-linear datapath coupled to the input, wherein the first non-linear datapath is configured to add a non-linear mirror image component to the DPD input signal to provide a first non-linear signal that is used to generate a first predistortion signal;
- a linear datapath coupled to the input in parallel with the first non-linear datapath to generate a second predistortion signal;
- and
- a first combiner configured to combine the first predistortion signal and the second predistortion signal to generate a DPD output signal.
A method, comprising:
- receiving a DPD input signal at an input of a digital predistortion (DPD) system;
- receiving the DPD input signal at a first non-linear datapath coupled to the input of the DPD system;
- adding, by the first non-linear datapath, a non-linear mirror image component to the DPD input signal to provide a first non-linear signal that is used to generate a first predistortion signal;
- receiving the DPD input signal at a linear datapath coupled to the input in parallel with the first non-linear datapath to generate a second predistortion signal;
- and
- combining, by a first combiner, the first predistortion signal and the second predistortion signal to generate a DPD output signal.
Dependencies are inferred from the claim text.