US 12,308,897 B2
Active damping and power control in NFC active load modulation
Ziga Korosak, Mojstrana (SI)
Assigned to STMicroelectronics Razvoj Polprevodnikov D.O.O., Ljubljana (SI)
Filed by STMicroelectronics Razvoj Polprevodnikov D.O.O., Ljubljana (SI)
Filed on Apr. 11, 2023, as Appl. No. 18/298,914.
Claims priority of application No. 22170024 (EP), filed on Apr. 26, 2022.
Prior Publication US 2023/0344468 A1, Oct. 26, 2023
Int. Cl. H04B 5/45 (2024.01); G06K 19/07 (2006.01)
CPC H04B 5/45 (2024.01) [G06K 19/0723 (2013.01)] 22 Claims
OG exemplary drawing
 
1. A method for managing a signal transmission emitted by a wireless transponder to a reader, the transmission using an active load modulation and being based on transmitted bursts separated by pause periods, each transmitted burst including transmitted pulses, the method comprising:
performing an active damping operation at an end of the transmitted bursts in a beginning of the pause periods, the active damping operation including transmitting a number of additional pulses having a phase opposite to a phase of the transmitted pulses; and
controlling the transmitted pulses' power, the additional pulses' power, and the number of additional pulses based on a distance between the reader and the wireless transponder and on reference values of the transmitted pulses' power, the additional pulses' power, and the number respectively associated with reference distances.