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公开(公告)号：US20190131934A1
公开(公告)日：2019-05-02
申请号：US15801232
申请日：2017-11-01
Applicant: ANALOG DEVICES GLOBAL UNLIMITED COMPANY
Inventor： Ahmed I. Khalil , Patrick Pratt
Abstract: Apparatus and methods provide predistortion for a phased array. Radio frequency (RF) sample signals from phased array elements are provided along return paths and are combined by a hardware RF combiner. Phase shifters are adjusted such that the RF sample signals are phase-aligned when combined. Adaptive adjustment of predistortion for the amplifiers of the phased array can be based on a signal derived from the combined RF sample signals.
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公开(公告)号：US11038474B2
公开(公告)日：2021-06-15
申请号：US15801232
申请日：2017-11-01
Applicant: ANALOG DEVICES GLOBAL UNLIMITED COMPANY
Inventor： Ahmed I. Khalil , Patrick Pratt
Abstract: Apparatus and methods provide predistortion for a phased array. Radio frequency (RF) sample signals from phased array elements are provided along return paths and are combined by a hardware RF combiner. Phase shifters are adjusted such that the RF sample signals are phase-aligned when combined. Adaptive adjustment of predistortion for the amplifiers of the phased array can be based on a signal derived from the combined RF sample signals.
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公开(公告)号：US20210376800A1
公开(公告)日：2021-12-02
申请号：US17303021
申请日：2021-05-18
Applicant: ANALOG DEVICES GLOBAL UNLIMITED COMPANY
Inventor： Ahmed I. Khalil , Patrick Pratt
Abstract: Apparatus and methods provide predistortion for a phased array. Radio frequency (RF) sample signals from phased array elements are provided along return paths and are combined by a hardware RF combiner. Phase shifters are adjusted such that the RF sample signals are phase-aligned when combined. Adaptive adjustment of predistortion for the amplifiers of the phased array can be based on a signal derived from the combined RF sample signals.
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公开(公告)号：US10320340B1
公开(公告)日：2019-06-11
申请号：US15868295
申请日：2018-01-11
Applicant: Analog Devices Global Unlimited Company
Inventor： Patrick Pratt , David Jennings
Abstract: Various examples are directed to a digital predistortion (DPD) circuit comprising a DPD actuator circuit, a DPD feedback frequency-shaping filter, a basis matrix generator circuit, a basis matrix frequency-shaping filter, and a DPD adaption circuit. The DPD actuator circuit may generate a predistorted signal based at least in part on an input signal and a set of frequency-shaped DPD parameters. The DPD feedback frequency-shaping filter may filter a DPD feedback signal to generate a frequency-shaped DPD feedback signal. A passband of the DPD feedback frequency-shaping filter may include substantially all of a bandwidth of the input signal and exclude a distortion term outside the bandwidth of the input signal. The basis matrix generator may generate a basis matrix based at least in part on a power amplifier feedback signal The basis matrix frequency-shaping filter may generate a frequency-shaped basis matrix based at least in part on the basis matrix. The DPD adaption circuit may be configured to generate the set of frequency-shaped DPD parameters based at least in part on the frequency-shaped basis matrix and the frequency-shaped DPD feedback signal.
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