US 12,488,213 B2
Smart card for performing biometric authentication and method of operating the same
Ji-Eun Jang, Suwon-si (KR); and Huijun Yang, Suwon-si (KR)
Assigned to SAMSUNG ELECTRONICS CO., LTD., Suwon-si (KR)
Filed by SAMSUNG ELECTRONICS CO., LTD., Suwon-si (KR)
Filed on Dec. 14, 2023, as Appl. No. 18/540,498.
Claims priority of application No. 10-2023-0042264 (KR), filed on Mar. 30, 2023.
Prior Publication US 2024/0330638 A1, Oct. 3, 2024
Int. Cl. G06K 19/073 (2006.01); G06K 7/00 (2006.01); G06K 7/016 (2006.01)
CPC G06K 19/07354 (2013.01) [G06K 7/0047 (2013.01); G06K 7/0166 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A smart card comprising:
a frequency measurement circuit configured to measure a first clock frequency of an external clock signal;
a sensor clock output circuit configured to select a first range from a plurality of first clock ranges based on the first clock frequency and to output a sensor clock signal having a second clock frequency corresponding to the first range; and
a sensor circuit configured to output sensing data for biometric authentication based on the sensor clock signal and first compensation image data,
wherein the sensor clock output circuit is configured to:
determine a first reference frequency corresponding to the first range; and
determine a value for the second clock frequency by multiplying the first reference frequency by a negative power of 2 or a positive power of 2.