公开(公告)号：US20220123696A1

公开(公告)日：2022-04-21

申请号：US17459050

申请日：2021-08-27

Applicant: NXP B.V.

Inventor： Robert van Veldhoven ,  Khalid Mabtoul ,  Dmitrij Andreevits Sjwed

IPC: H03F3/181

Abstract: A digital signal generator apparatus and method is described. The digital signal generator includes a counter, an integrator and a comparator. The counter counts up or down from an initial counter value dependent on a counter control input. The comparator has a first input coupled to the counter output, a threshold input and a comparator output coupled to the counter control input. The integrator has an input coupled to the counter output and an output coupled to the digital signal generator output. The digital signal generator determines the count direction after the initial direction dependent on the comparison between a threshold value applied to the threshold input and the counter output value. The digital signal generator may implement the generation of a waveform having an approximation to a raised cosine function. The generated waveform may be used for audio artefact reduction in an audio amplifier during mute or unmute operations or during power up power down operations.

公开(公告)号：US10014873B1

公开(公告)日：2018-07-03

申请号：US15714230

申请日：2017-09-25

Applicant: NXP B.V.

Inventor： Robert van Veldhoven ,  Rui Quan

IPC: H03M1/66 ,  H03M1/06 ,  H03M1/78

CPC classification number: H03M1/0604 ,  H03M1/066 ,  H03M1/765 ,  H03M1/785

Abstract: A digital-to-analog converter (DAC) includes a plurality of resistive elements connected together in series to form a ring of resistive elements. A node is formed by each of the connections of adjacent resistive elements of the ring. Groups of parallel-connected switches are coupled to each node. A first switch of the group of switches is for selectively coupling a first power supply voltage terminal to the node. A second switch of the group of switches is for selectively coupling a second power supply voltage to the node. A third switch of the group of switches is for selectively coupling an output terminal to the node. A differential or single-ended analog output may be provided. Mismatch induced error is removed using a mismatch error shaping technique that shapes the errors outside a pass-band.

公开(公告)号：US10006972B2

公开(公告)日：2018-06-26

申请号：US15347872

申请日：2016-11-10

Applicant: NXP B.V.

Inventor： Klaus Reimann ,  Robert van Veldhoven ,  Jaap Ruigrok ,  Selcuk Ersoy ,  Ralf van Otten ,  Jörg Kock

IPC: G01R33/09 ,  G01R33/00

CPC classification number: G01R33/0029 ,  G01R33/0017 ,  G01R33/0035 ,  G01R33/0082 ,  G01R33/096

Abstract: A magnetic field sensor is disclosed for providing an output signal in response to an external magnetic field. The sensor comprises a primary magnetic field transducer for producing a primary signal in response to the external magnetic field and having a first magnetic field saturation characteristic; a secondary magnetic field transducer for producing a secondary signal in response to the external magnetic field and having a second magnetic field saturation characteristic. The first magnetic field saturation characteristic is different from the second magnetic field saturation characteristic. The sensor is configured to use the secondary signal to correct for errors in the output signal arising from saturation of the primary transducer.