US 12,431,924 B2
Digital pre-distortion calibration of a radio frequency power amplifier
Amit Shaw, Bangalore (IN); and Kempraju Gopinath, Bangalore (IN)
Assigned to Cypress Semiconductor Corporation, San Jose, CA (US)
Filed by Cypress Semiconductor Corporation, San Jose, CA (US)
Filed on Jun. 14, 2023, as Appl. No. 18/335,038.
Prior Publication US 2024/0421839 A1, Dec. 19, 2024
Int. Cl. H04B 1/04 (2006.01); H03F 1/32 (2006.01)
CPC H04B 1/0475 (2013.01) [H03F 1/3241 (2013.01); H04B 2001/045 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method comprising:
initiating digital pre-distortion calibration of a power amplifier of a radio frequency (RF) module to learn a non-linearity of the power amplifier;
determining, based on varying a transmission power of a training signal transmitted to the power amplifier between a first transmission power value and a second transmission power value, a set of estimated coefficients;
generating, based on a subset of the set of estimated coefficients, a set of predicted coefficients, wherein the set of predicted coefficients is obtained from a fitted curve derived from a fitting curve applied to the subset of the set of estimated coefficients;
storing the set of estimated coefficients and the set of predicted coefficients which represent the non-linearity of the power amplifier; and
linearizing, using the set of estimated coefficients and the set of predicted coefficients, the power amplifier.