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公开(公告)号：US20210036726A1
公开(公告)日：2021-02-04
申请号：US16928411
申请日：2020-07-14
Applicant: NXP B.V.
Inventor： Ulrich Andreas MUEHLMANN , Shuli Chi , Martin Hrastnik
Abstract: Disclosed is a method for sensitivity control in a near-field communication, NFC, device operating in a receiving mode. The method comprises calculating a threshold value, using a threshold value calculating unit, as a function of a determined current received signal strength indicator, RSSI, value, optionally a determined current gain control, GC, value, and further optionally a so-called margin value that is a product-specific parameter, and applying the calculated threshold value as a threshold parameter to a threshold comparison unit, which is configured to receive, as input. a first time-derivative signal derived from a combined output signal that is determined as a function of a digital I-channel signal output and a digital Q-channel signal output of an I&Q demodulating block, to compare the first time-derivative signal with the applied threshold parameter, and to provide a binary output that is indicative of whether the input first time-derivative signal is greater than the applied threshold parameter or not.
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公开(公告)号：US20240372258A1
公开(公告)日：2024-11-07
申请号：US18144188
申请日：2023-05-06
Applicant: NXP B.V.
Abstract: A device may include a data storage device storing a first look-up table that contains a plurality of distance mappings that each associate a value of a first signal feature with a distance value. An NFC reader is configured to communicate with an NFC tag includes: an antenna, a transmitter that is configured to use the antenna to transmit a radio frequency transmitted field, a receiver configured to receive from the antenna one or more response signals in response to the radio frequency transmitted field transmitted by the transmitter, and a signal processor configured to: process the one or more response signals to determine a first value of the first signal feature, access the first look-up table to determine a first distance mapping that associates the value of the first signal feature with a first distance, and generate an output signal based upon the first distance.
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公开(公告)号：US20210351961A1
公开(公告)日：2021-11-11
申请号：US17232379
申请日：2021-04-16
Applicant: NXP B.V.
Inventor： Ulrich Andreas MUEHLMANN , Wolfgang Hrauda , Gregor Hauseder , Tim Daniel Raspel
Abstract: In accordance with a first aspect of the present disclosure, a channel equalizer is provided for use in a near field communication (NFC) device, the channel equalizer comprising: a filter configured to receive an input signal and to generate a filtered output signal; an estimator configured to determine filter coefficients to be used by said filter; a synchronizer configured to determine when to enable the channel equalizer and to provide one or more corresponding control signals to the estimator. In accordance with a second aspect of the present disclosure, a corresponding method of operating a channel equalizer for use in a near field communication (NFC) device is conceived.
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公开(公告)号：US20190190554A1
公开(公告)日：2019-06-20
申请号：US15907544
申请日：2018-02-28
Applicant: NXP B.V.
Inventor： Radha SRINIVASAN , Ulrich Andreas MUEHLMANN , Frederic BENOIST , Stefan MENDEL , Steve CHARPENTIER
IPC: H04B1/12 , H04B5/00 , H04B17/318
Abstract: Embodiments are provided for a method of operating a receiver system, the receiver system comprising one or more channels, the method comprising: monitoring a residual DC (direct current) offset in a present channel by sampling an output of an analog-to-digital converter (ADC) of the present channel; adjusting a DCO (direct current offset) correction signal that corresponds to the residual DC offset in response to an absolute value of the residual DC offset exceeding a programmable DCO threshold; and subtracting the DCO correction signal from an analog signal provided to the ADC to reduce the residual DC offset below the programmable DCO threshold.
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