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Patent Agency Ranking
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.
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2.发明授权公开(公告)号：US11764833B2
公开(公告)日：2023-09-19
申请号：US17452806
申请日：2021-10-29
Applicant: NXP B.V.
Inventor： Johannes Stahl , Ulrich Andreas Muehlmann , Adrian Rafael Krenn
CPC classification number: H04B5/0062 , H04B5/0068 , H04L5/0048
Abstract: There is described a method of determining a phase value for an NFC card emulating device that enables said NFC card emulating device to communicate in phase with an NFC reader device while utilizing active load modulation, wherein the NFC card emulating device comprises a card antenna and the NFC reader device comprises a reader antenna, the method comprising receiving a reader signal from the NFC reader device at the NFC card emulating device through coupling of the card antenna and the reader antenna, the reader signal comprising a subcarrier modulation; estimating a resonance frequency of a system corresponding to the coupled card antenna and reader antenna based on the received communication signal; and determining the phase value based on the estimated resonance frequency and a set of parameters that represents a predetermined reference system. Furthermore, an NFC card emulating device, an NFC system, and a computer program are described.
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3.发明申请公开(公告)号：US20220166463A1
公开(公告)日：2022-05-26
申请号：US17452806
申请日：2021-10-29
Applicant: NXP B.V.
Inventor： Johannes Stahl , Ulrich Andreas Muehlmann , Adrian Rafael Krenn
Abstract: There is described a method of determining a phase value for an NFC card emulating device that enables said NFC card emulating device to communicate in phase with an NFC reader device while utilizing active load modulation, wherein the NFC card emulating device comprises a card antenna and the NFC reader device comprises a reader antenna, the method comprising receiving a reader signal from the NFC reader device at the NFC card emulating device through coupling of the card antenna and the reader antenna, the reader signal comprising a subcarrier modulation; estimating a resonance frequency of a system corresponding to the coupled card antenna and reader antenna based on the received communication signal; and determining the phase value based on the estimated resonance frequency and a set of parameters that represents a predetermined reference system. Furthermore, an NFC card emulating device, an NFC system, and a computer program are described.
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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
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.
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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.
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