公开(公告)号：US11481595B2

公开(公告)日：2022-10-25

申请号：US17247650

申请日：2020-12-18

Applicant: NXP B.V.

Inventor： Thomas Pichler ,  Ivan Jesus Rebollo Pimentel ,  Christian Weidinger ,  Franz Amtmann ,  Werner Zettler ,  Heinz Umfahrer

IPC: G06K19/077 ,  G06K7/10

Abstract: A Radio Frequency Identification (RFID) tag is disclosed. The RFID tag includes an antenna to receive an input AC signal and a tuning system coupled with the antenna to optimize signal strength of the input AC signal. The tuning system includes a charge pump rectifier. A diode rectifier is included and is coupled with the antenna to receive the input AC signal after the tuning system optimizes the signal strength by tuning input impedance of the antenna.

公开(公告)号：US11411492B1

公开(公告)日：2022-08-09

申请号：US17303485

申请日：2021-05-29

Applicant: NXP B.V.

Inventor： Thomas Pichler ,  Ivan Jesus Rebollo Pimentel

IPC: H02M3/07 ,  G06K19/07

Abstract: A charge pump for a Radio Frequency Identification (RFID) tag is disclosed. The charge pump includes an antenna port to receive an input AC signal, an input port to receive an input signal, and a main transistor having a gate, a source and a drain. A threshold voltage cancellation circuit is included and is coupled between one terminal of the antenna port and the input port, wherein an output of the threshold voltage cancellation circuit is configured to drive the gate of the main transistor. The threshold voltage cancellation circuit is configured to reduce the threshold voltage of the main transistor when the voltage of the input signal is below a predefined voltage level and to remove threshold voltage cancellation when the voltage of the input signal is above the predefined voltage levels.

公开(公告)号：US11206058B2

公开(公告)日：2021-12-21

申请号：US17024055

申请日：2020-09-17

Applicant: NXP B.V.

Inventor： Thomas Pichler ,  Ivan Jesus Rebollo Pimentel

IPC: H04B5/00 ,  G06K19/07

Abstract: In accordance with a first aspect of the present disclosure, a radio frequency identification (RFID) transponder is provided, comprising a modulator, a current sensor and a clock recovery circuit, wherein: the modulator is configured to modulate an unmodulated carrier signal received from an external RFID reader; the current sensor is configured to sense a current that flows through one or more transistors comprised in the modulator; and the clock recovery circuit is configured to recover a clock signal using the current sensed by the current sensor. In accordance with a second aspect of the present disclosure, a corresponding method of operating a radio frequency identification (RFID) transponder is conceived.

公开(公告)号：US11164062B2

公开(公告)日：2021-11-02

申请号：US17065582

申请日：2020-10-08

Applicant: NXP B.V.

Inventor： Thomas Pichler ,  Ivan Jesus Rebollo Pimentel ,  Stefan Maier ,  Egas Carvalho Henes Neto ,  Harcharan Singh Madaan ,  Slawomir Rafal Malinowski

IPC: G06K19/07

Abstract: In accordance with a first aspect of the present disclosure, a radio frequency identification (RFID) transponder is provided, comprising a modulator and a controller, wherein: the modulator is configured to generate a modulated signal to be transmitted to an external RFID reader; the controller is configured to regulate an input voltage for the modulator, resulting in a regulated input voltage, and to feed said regulated input voltage to the modulator. In accordance with a second aspect of the present disclosure, a corresponding method of operating a radio frequency identification (RFID) transponder is provided.

公开(公告)号：US20210103789A1

公开(公告)日：2021-04-08

申请号：US17015871

申请日：2020-09-09

Applicant: NXP B.V.

Inventor： Thomas Pichler ,  Ivan Jesus Rebollo Pimentel

IPC: G06K19/07 ,  H02M3/07

Abstract: In accordance with a first aspect of the present disclosure, a radio frequency identification (RFID) transponder is provided, comprising: at least one functional component configured to perform a function of the RFID transponder; a charge pump configured to supply an output voltage to said functional component, wherein said charge pump comprises a plurality of charge pump stages; a charge pump controller configured to control a number of charge pump stages which contribute to the output voltage. In accordance with a second aspect of the present disclosure, a corresponding method of operating an RFID transponder is conceived.

公开(公告)号：US11720778B2

公开(公告)日：2023-08-08

申请号：US17445752

申请日：2021-08-24

Applicant: NXP B.V.

Inventor： Thomas Pichler ,  Ivan Jesus Rebollo Pimentel

IPC: G08B13/14 ,  G06K19/07 ,  H03K17/693

CPC classification number: G06K19/0713 ,  G06K19/0715 ,  G06K19/0726 ,  H03K17/693

Abstract: A voltage limiter incorporated in a radio frequency identification (RFID) integrated circuit (IC) for a RFID tag is disclosed. The RFID IC includes a radio frequency (RF) rectifier and a clock generator. The RF rectifier is configured to convert an AC signal received from an antenna incorporated in the RFID tag to a DC signal. The voltage limiter includes a current sink device coupled between output of the RF rectifier and ground and a charge pump to control conduction of current through the current sink device to limit output voltage of the RF rectifier to a predefined voltage level.

公开(公告)号：US11636303B2

公开(公告)日：2023-04-25

申请号：US17247997

申请日：2021-01-04

Applicant: NXP B.V.

Inventor： Thomas Pichler ,  Ivan Jesus Rebollo Pimentel

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

Abstract: A ground switch is disclosed. The ground switch includes an antenna port, a pair of switching devices coupled with the antenna port and a charge pump coupled with the pair of devices and configured to turn on/off the pair of devices based on an AC input signal received through the antenna port and a DC offset voltage added to the AC input signal. The ground switch further includes a clamping circuit to clamp an output of the charge pump. The ground switch is configured to provide a stable ground to components of devices such that a radio frequency identification (RFID) device.

公开(公告)号：US11126906B2

公开(公告)日：2021-09-21

申请号：US16893652

申请日：2020-06-05

Applicant: NXP B.V.

Inventor： Thomas Pichler

IPC: G06K19/07

Abstract: In accordance with a first aspect of the present disclosure, a radio frequency identification (RFID) transponder is provided, comprising a modulator and a controller, wherein: the modulator is configured to generate a modulated signal to be transmitted to an external RFID reader; the controller is configured to increase a transmitter impedance during a first period of time; the controller is configured to decrease the transmitter impedance by enabling the modulator during a second period of time. In accordance with a second aspect of the present disclosure, a corresponding method of operating a radio frequency identification (RFID) transponder is conceived.

公开(公告)号：US12141636B2

公开(公告)日：2024-11-12

申请号：US17655113

申请日：2022-03-16

Applicant: NXP B.V.

Inventor： Christian Schwar ,  Christian Weidinger ,  Franz Amtmann ,  Heinz Umfahrer ,  Christoph Hans Joachim Garbe ,  Thomas Pichler

IPC: G06K19/077 ,  G06K7/10 ,  G06Q10/087 ,  H04W4/80

Abstract: There is described an RFID tag IC, comprising: i) an NFC interface configured to initiate a power-up, when coupled with an HF field, and receive a read command from an RFID device; ii) a non-volatile memory, wherein the non-volatile memory is configured to store a counter value; and iii) a processing unit configured to increment the counter value when coupled with the HF field, set an increment flag, when the increment is successful, and thereby block a further increment of the counter value, in particular when fulfilling the read command, and reset the increment flag after fulfilling the read command. Further, a communication system and a method of operating are described.

公开(公告)号：US20230359234A1

公开(公告)日：2023-11-09

申请号：US18298005

申请日：2023-04-10

Applicant: NXP B.V.

Inventor： Thomas Pichler ,  Ivan Jesus Rebollo Pimentel

IPC: G05F1/575 ,  G05F1/565 ,  G06K19/07

CPC classification number: G05F1/575 ,  G05F1/565 ,  G06K19/0715

Abstract: A voltage limiter for a radio-frequency identification (RFID) integrated circuit (IC) for an RFID tag and a method for operating a voltage limiter is disclosed. The RFID IC includes a radio-frequency (RF) rectifier. The voltage limiter comprises: a current sink device coupled between an output of the RF rectifier and ground; a reference generator having an output for providing a reference voltage (Vlim) for controlling a current through the current sink device to limit a voltage (Vrec) at the output of the RF rectifier to values below a predefined voltage level; and feedback circuitry arranged to provide a feedback current to the reference generator to vary the reference voltage (Vlim), the feedback current being dependent on the current through the current sink device.