US 12,451,913 B2
Systems and methods of compensating a transmit signal for charge trapping effects of a power amplifier
Patrick Pratt, Mallow (IE); Dong Chen, Beijing (CN); Mark Cope, Bath (GB); Christopher Mayer, Dover, MA (US); Praveen Chandrasekaran, Bangalore (IN); Stephen Summerfield, Melrose, MA (US); and Naveen Naraharisetti, Westford, MA (US)
Assigned to Analog Devices International Unlimited Company, Co. Limerick (IE)
Appl. No. 18/569,401
Filed by Analog Devices International Unlimited Company, County Limerick (IE)
PCT Filed Jun. 8, 2022, PCT No. PCT/EP2022/065580
§ 371(c)(1), (2) Date Dec. 12, 2023,
PCT Pub. No. WO2022/268508, PCT Pub. Date Dec. 29, 2022.
Claims priority of provisional application 63/202,781, filed on Jun. 24, 2021.
Prior Publication US 2024/0283474 A1, Aug. 22, 2024
Int. Cl. H04B 1/04 (2006.01); H03F 1/32 (2006.01); H03F 3/24 (2006.01)
CPC H04B 1/0475 (2013.01) [H03F 1/3258 (2013.01); H03F 3/245 (2013.01); H03F 2200/451 (2013.01); H03F 2201/3224 (2013.01); H04B 2001/0425 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A radio frequency (RF) communication system comprising:
a transmitter configured to receive an input transmit signal and to output an RF transmit signal; and
a power amplifier configured to amplify the RF transmit signal,
wherein the transmitter comprises a digital pre-distortion (DPD) system configured to process the input transmit signal to pre-distort the RF transmit signal, the DPD system including a first non-linear filter along a first signal path and a second non-linear filter along a second signal path in parallel with the first signal path, wherein the DPD system is configured to train the second non-linear filter based on both a first set of observations captured from the first signal path and a second set of observations captured from the RF transmit signal.