公开(公告)号：US20220164618A1

公开(公告)日：2022-05-26

申请号：US17451886

申请日：2021-10-22

Applicant: NXP B.V.

Inventor： Thomas Pichler ,  Ivan Jesus Rebollo Pimentel

IPC: G06K19/07 ,  G06K19/077 ,  H02M3/07

Abstract: There is described a rectifier circuit for providing and limiting a supply voltage to an RFID tag, the circuit including a pair of antenna input terminals configured to receive an input signal from an RFID tag antenna. A plurality of charge pump stages are coupled in cascade in such a way that an input terminal of a first charge pump stage in the cascade is connected to ground and an input terminal of each subsequent charge pump stage in the cascade is coupled to an output terminal of the preceding charge pump stage in the cascade. A control logic is configured to select the output terminal of one charge pump stage among the plurality of charge pump stages to provide the supply voltage. Furthermore, an RFID tag and a method of providing and limiting a supply voltage to an RFID tag are described.

公开(公告)号：US11321600B1

公开(公告)日：2022-05-03

申请号：US17303488

申请日：2021-05-29

Applicant: NXP B.V.

Inventor： Thomas Pichler ,  Ivan Jesus Rebollo Pimentel

IPC: G06K19/07 ,  G06K19/077

Abstract: A Radio Frequency Identification (RFID) tag is disclosed. The RFID tag includes an antenna port to receive an input AC signal and a self-tuning circuit coupled with the antenna port to optimize signal strength of the input AC signal during a self-tuning phase. The RFID tag further includes an AC limiter configured to limit the voltage of the input AC signal to a preconfigured limit and a limiter controller configured to disable the AC limiter during the self-tuning phase and re-enable the AC limiter after the self-tuning phase. The self-tuning phase occurs prior to the data communication period in which the data stored in the RFID tag is transmitted back to a reader.

公开(公告)号：US20220027581A1

公开(公告)日：2022-01-27

申请号：US17305071

申请日：2021-06-30

Applicant: NXP B.V.

Inventor： Thomas Pichler ,  Ivan Jesus Rebollo Pimentel

IPC: G06K7/10 ,  G06K19/07

Abstract: In accordance with a first aspect of the present disclosure, a radio frequency identification (RFID) transponder is provided, comprising: a receiver configured to receive a command from an external RFID reader, wherein the command is a first command transmitted by the RFID reader during a communication session and wherein said command comprises a at least one parameter indicative of one or more modifiable settings of the RFID transponder; and a controller configured to modify the settings of the RFID transponder in accordance with a value of said parameter. In accordance with a second aspect of the present disclosure, a corresponding method of operating a radio frequency identification (RFID) transponder is conceived.