US 12,355,474 B2
Enhanced DPD method to correct gain flatness for wireless communications systems
Stephen Summerfield, Santa Clara, CA (US); and Sefa Tanis, North Chelmsford, MA (US)
Assigned to ANALOG DEVICES, INC., Wilmington, MA (US)
Filed by Analog Devices, Inc., Wilmington, MA (US)
Filed on May 11, 2022, as Appl. No. 17/741,448.
Claims priority of provisional application 63/187,372, filed on May 11, 2021.
Prior Publication US 2022/0376714 A1, Nov. 24, 2022
Int. Cl. H04B 1/04 (2006.01); H04L 25/49 (2006.01); H04L 27/26 (2006.01); H04L 27/36 (2006.01)
CPC H04B 1/04 (2013.01) [H04L 25/49 (2013.01); H04L 27/2695 (2013.01); H04L 27/367 (2013.01); H04B 2001/0425 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A transmitter with gain flatness correction when transitioning from narrowband operation to wideband operation, comprising:
an input;
a digital predistortion function to predistort the input and generate a predistorted input;
an amplifier to receive the predistorted input, amplify the predistorted input, and generate an output;
data store to store (1) one or more captures of the predistorted input and the output of the amplifier and (2) regularization data, wherein the regularization data is pre-loaded on the data store; and
adaptation logic coupled to the data store to determine coefficients for the digital predistortion function.