US 12,132,816 B2
Method and integrated circuit for clock recovery in an RFID tag
Rainer Stadlmair, Deutschfeistritz (AT); Shankar Joshi, Bangalore (IN); and Raghavendra Kongari, Bangalore (IN)
Assigned to NXP B.V., Eindhoven (NL)
Filed by NXP B.V., Eindhoven (NL)
Filed on Jan. 4, 2023, as Appl. No. 18/149,713.
Claims priority of application No. 202221056463 (IN), filed on Sep. 30, 2022.
Prior Publication US 2024/0113855 A1, Apr. 4, 2024
Int. Cl. H04L 7/033 (2006.01); G06K 19/07 (2006.01); H04L 7/00 (2006.01)
CPC H04L 7/0337 (2013.01) [G06K 19/0723 (2013.01); H04L 7/0037 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method for clock recovery in a radio frequency identification (RFID) tag, the method comprising:
receiving a radio frequency (RF) field from a RFID reader;
generating a field clock from the received RF field, wherein the RFID tag generates a clock recovery signal from the field clock;
modulating the RF field to produce a RF modulation and pausing generation of the clock recovery signal while the RF field is being modulated;
generating a modulation envelope signal and using the modulation envelope signal for load modulation; and
resuming generation of the clock recovery signal at the end of the RF modulation after a first delay of one clock cycle of the clock recovery signal in response to a falling edge of the modulation envelope signal.