公开(公告)号：US10224970B2

公开(公告)日：2019-03-05

申请号：US15159492

申请日：2016-05-19

Applicant: Analog Devices Global

Inventor： Patrick Pratt

IPC: H04B1/04 ,  H04L25/03

Abstract: Various examples are directed to systems and methods for wideband digital predistortion. A digital pre-distortion circuit may be programmed to receive a complex baseband signal and generate a pre-distorted signal. Generating the pre -distorted signal may comprise applying to the complex baseband signal a first correction for an Nth order distortion of a power amplifier at an Ith harmonic frequency zone centered at about an Ith harmonic of a carrier frequency and applying to the complex baseband signal a second correction for the Nth order distortion at a Jth harmonic frequency zone centered at about a Jth harmonic of the carrier frequency different than the Ith harmonic of a carrier frequency.

公开(公告)号：US20180167091A1

公开(公告)日：2018-06-14

申请号：US15372723

申请日：2016-12-08

Applicant: Analog Devices Global

Inventor： Patrick Pratt ,  Michael O'Brien

IPC: H04B1/04 ,  H04B7/06

CPC classification number: H04B1/0475 ,  H04B1/0483 ,  H04B7/0617 ,  H04B2001/0425 ,  Y02D70/40 ,  Y02D70/444

Abstract: Power amplifier circuits can behave in a non-linear manner particularly when operated to produce output signal swings approaching an amplifier saturation region. A pre-distortion signal can be applied to a signal to be transmitted to compensate for such power amplifier non-linearity. In applications where two or more transmitter power amplifiers are used, a beam-former can be configured to modify a digitally pre-distorted transmission signal by applying respective beam-forming weighting factors to the digitally pre-distorted transmission signal to provide input transmission signals for respective ones of the power amplifier circuits. The pre-distortion signal can be established at least in part using one or more of a sensed or estimated representation of a transmitted beam formed by spatially aggregating transmitted outputs from the two or more power amplifier circuits. In this manner, power amplifier efficiency can be enhanced without entirely separate pre-distortion compensation for each of the power amplifier circuits.

公开(公告)号：US09831898B2

公开(公告)日：2017-11-28

申请号：US13801130

申请日：2013-03-13

Applicant: Analog Devices Global

Inventor： Patrick Pratt ,  Peadar Antony Forbes ,  David J. McLaurin ,  Martin McCormick

IPC: H04B1/00 ,  H04B1/04 ,  H04B1/525

CPC classification number: H04B1/0475 ,  H04B1/525

Abstract: Transmitter noise cancellation may be applied on a channel by channel basis to active channels of an incoming radio frequency signal received at a receiver. A noise cancellation filter may be provided for each active channel in a predetermined signal band. Applying noise cancellation on a per active channel basis instead of to the entire receive band may substantially reduce the filtering requirement and number of filter coefficients or taps to save power and reduce manufacturing costs. Channelized transmitter noise cancellers, multi transmitter-receiver cross coupling cancellers, and hybrid full signal band and channelized transmitter noise cancellers are also provided.