US 12,132,495 B2
Telepowered contactless card
Julien Goulier, Grenoble (FR); and Franck Montaudon, Meylan (FR)
Assigned to Microelectronics France, Montrouge (FR); and STMicroelectronics (Grenoble 2) SAS, Grenoble (FR)
Filed by STMicroelectronics France, Montrouge (FR); and STMicroelectronics (Grenoble 2) SAS, Grenoble (FR)
Filed on Dec. 21, 2022, as Appl. No. 18/069,459.
Claims priority of application No. 2200102 (FR), filed on Jan. 7, 2022.
Prior Publication US 2023/0223948 A1, Jul. 13, 2023
Int. Cl. H03M 1/12 (2006.01); H04B 5/72 (2024.01); G06K 19/077 (2006.01); H04B 5/00 (2006.01)
CPC H03M 1/124 (2013.01) [H04B 5/72 (2024.01); G06K 19/07773 (2013.01); H04B 5/00 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method, comprising:
receiving, by an antenna couplable to an electronic device, an amplitude-modulated analog signal associated with an electromagnetic field generated by an external device, the electromagnetic field having intervals with minimal levels;
generating a demodulated signal based on the amplitude-modulated analog signal, the demodulated signal comprising a rectified, filtered, and demodulated signal of the amplitude-modulated analog signal;
generating a binary signal based on the demodulated signal;
determining a maximum amplitude value of the electromagnetic field before a pause based on the binary signal; and
coupling a resistance to the antenna during the pause, a value of the resistance being based on the maximum amplitude value.