公开(公告)号：US11005534B2

公开(公告)日：2021-05-11

申请号：US16988852

申请日：2020-08-10

Applicant: NXP B.V.

Inventor： Fred George Nunziata ,  Martin Buchsbaum ,  Erich Merlin ,  Adrian Rafael Krenn

IPC: H04B5/00

Abstract: In accordance with a first aspect of the present disclosure, a near field communication (NFC) device is provided, comprising: a modulator configured to modulate a carrier signal received from an external reader, resulting in a modulated carrier signal; a controller configured to control a transmission of the modulated carrier signal to the external reader; a transmitter driver configured to transmit said modulated carrier signal, said transmitter driver having a variable resistance; wherein the controller is further configured to change said variable resistance during a modulation phase of the NFC device such that a clock synchronization window is widened. In accordance with a second aspect of the present disclosure, a corresponding method of operating an NFC device is conceived. In accordance with a third aspect of the present disclosure, a non-transitory machine-readable medium is provided, comprising instructions which, when executed, carry out a method of the kind set forth.

公开(公告)号：US10237000B1

公开(公告)日：2019-03-19

申请号：US15973724

申请日：2018-05-08

Applicant: NXP B.V.

Inventor： Martin Buchsbaum ,  Erich Merlin ,  Manuel Markus Figer

IPC: H04L7/00 ,  H04L25/00 ,  H04L25/40 ,  H04B17/12 ,  H04B5/00 ,  H04L7/033 ,  H04B5/02 ,  G06Q20/32

Abstract: A method for compensating phase shift is provided. The method includes sweeping a transmitter (TX) clock frequency over a frequency range and sampling resistance values at a receiver (RX) circuit while sweeping the TX clock frequency. A first frequency in the frequency range is determined which corresponds to a maximum resistance value sampled at the RX circuit. Using a look-up table (LUT), a phase adjust value is determined based on the first frequency. A phase of the TX clock is adjusted based on the phase adjust value.

公开(公告)号：US20230396274A1

公开(公告)日：2023-12-07

申请号：US18321078

申请日：2023-05-22

Applicant: NXP B.V.

Inventor： Adrian Rafael Krenn ,  Rahul Nadgouda ,  Erich Merlin ,  Martin Buchsbaum

IPC: H04B1/04 ,  H04B5/00

CPC classification number: H04B1/0458 ,  H03H7/38 ,  H04B5/0062 ,  H04B5/0031

Abstract: There is described a method of operating an NFC device, the method comprising: determining a resonance frequency of a matching network of the NFC device; modulating, by a modulator, a carrier signal received from an external reader, resulting in a modulated carrier signal; controlling, using a controller, a transmission of the modulated carrier signal to the external reader; and transmitting, by a transmitter driver, said modulated carrier signal, said transmitter driver having at least one configurable setting that influences a damping behavior of the transmitted modulated carrier signal, wherein, during a modulation phase of the NFC device, the controller selects and applies the at least one configurable setting based on the determined resonance frequency such that a clock synchronization window is widened. Furthermore, a corresponding NFC device is described.

公开(公告)号：US20210075470A1

公开(公告)日：2021-03-11

申请号：US16988852

申请日：2020-08-10

Applicant: NXP B.V.

Inventor： Fred George NUNZIATA ,  Martin Buchsbaum ,  Erich Merlin ,  Adrian Rafael Krenn

IPC: H04B5/00

Abstract: In accordance with a first aspect of the present disclosure, a near field communication (NFC) device is provided, comprising: a modulator configured to modulate a carrier signal received from an external reader, resulting in a modulated carrier signal; a controller configured to control a transmission of the modulated carrier signal to the external reader; a transmitter driver configured to transmit said modulated carrier signal, said transmitter driver having a variable resistance; wherein the controller is further configured to change said variable resistance during a modulation phase of the NFC device such that a clock synchronization window is widened. In accordance with a second aspect of the present disclosure, a corresponding method of operating an NFC device is conceived. In accordance with a third aspect of the present disclosure, a non-transitory machine-readable medium is provided, comprising instructions which, when executed, carry out a method of the kind set forth.