公开(公告)号：US11043929B2

公开(公告)日：2021-06-22

申请号：US16702793

申请日：2019-12-04

Applicant: NXP B.V.

Inventor： Steve Charpentier ,  Stefan Mendel ,  Ulrich Andreas Muehlmann ,  Helmut Kranabenter

IPC: H03G3/30 ,  H03G3/00 ,  H03M1/18 ,  H04L27/08 ,  H04W52/52

Abstract: Embodiments of methods and systems for gain control in a communications device are described. In an embodiment, a method for gain control in a communications device involves detecting a change in an amplification gain that is applied to an analog signal in the communications device and compensating for the change in the amplification gain by manipulating an amplitude of a digital signal that is converted from the analog signal. Other embodiments are also described.

公开(公告)号：US11171687B2

公开(公告)日：2021-11-09

申请号：US16691959

申请日：2019-11-22

Applicant: NXP B.V.

Inventor： Steve Charpentier ,  Ulrich Andreas Muehlmann ,  Stefan Mendel

IPC: H04B5/00 ,  H04L7/00 ,  H04L7/02 ,  H04B5/02

Abstract: Embodiments of methods and systems for operating a communications device that communicates via inductive coupling are described. In an embodiment, a method for operating a communications device that communicates via inductive coupling involves detecting a falling signal edge corresponding to a received signal at the communications device based on a falling signal edge threshold, detecting a rising signal edge corresponding to the received signal based on a rising signal edge threshold, where the rising signal edge threshold is independent from the falling signal edge threshold, and decoding the received signal based on the detected falling signal edge and the detected rising signal edge. Other embodiments are also described.

公开(公告)号：US10735038B2

公开(公告)日：2020-08-04

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 ,  H04B17/318 ,  H04B5/00 ,  H03M1/06 ,  H03M1/12

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.

公开(公告)号：US11206170B2

公开(公告)日：2021-12-21

申请号：US16704262

申请日：2019-12-05

Applicant: NXP B.V.

Inventor： Ulrich Andreas Muehlmann ,  Stefan Mendel ,  Steve Charpentier

IPC: H04L27/36 ,  H04L27/38 ,  H03D7/14

Abstract: Embodiments of communications devices and methods for operating a communications device are described. In an embodiment, a communications device includes a complex multiplier configured to multiply a first input complex signal with a second input complex signal to generate an output complex signal, an amplifier configured to amplify an imaginary part of the output complex signal to generate an amplification result, a delay element configured to delay a rotation angle signal that is related to the second input complex signal, and a subtractor configured to subtract the amplification result from the delayed rotation angle signal to generate the rotation angle signal. Other embodiments are also described.

公开(公告)号：US11025302B2

公开(公告)日：2021-06-01

申请号：US16849062

申请日：2020-04-15

Applicant: NXP B.V.

Inventor： Steve Charpentier ,  Stefan Mendel ,  Ulrich Andreas Muehlmann

IPC: H04B5/00

Abstract: A contactless communication device includes a near field communication (NFC) module for generating an electromagnetic carrier signal and modulating the carrier signal according to data to be transmitted, and an antenna coupled to and driven by said NFC module with the modulated carrier signal. The device includes an RF front end coupled between said NFC module and said antenna and further includes a detection module coupled to said NFC module for detecting an end of a PauseA of an incoming RF signal by monitoring an amplitude of a digital output signal derived from the incoming RF signal. The detection module detects the PauseA in said digital output signal by comparing the amplitude of said output digital signal to a first level. The detection module further detects the end of the PauseA in said digital output signal by comparing the amplitude of said digital output signal to a second level.