公开(公告)号：US20210275035A1

公开(公告)日：2021-09-09

申请号：US17195634

申请日：2021-03-08

Applicant: Stichting IMEC Nederland

Inventor： Yiting LU ,  Marco MERCURI

IPC: A61B5/024 ,  G16H10/60 ,  G16H50/30 ,  G16H40/60

Abstract: A method for automatic multi-object localization and/or vital sign monitoring is provided. The method comprises the steps of receiving a radar signal in order to form a corresponding observation matrix, reducing noise by applying singular value decomposition to the observation matrix, processing the result of the singular value decomposition by an independent component analysis in order to estimate the corresponding sources, and estimating propagation channels of the estimated sources by minimizing the corresponding residual error based on the observation matrix and the estimated sources.

公开(公告)号：US11096629B2

公开(公告)日：2021-08-24

申请号：US15247172

申请日：2016-08-25

Applicant: Stichting IMEC Nederland

Inventor： Pieter Harpe ,  Jiawei Xu

IPC: A61B5/00 ,  A61B5/0537 ,  G01N27/02 ,  G01N33/483 ,  A61B5/30 ,  A61B5/318 ,  A61B5/0205 ,  A61B5/053

Abstract: The present disclosure is directed to an impedance spectroscopy system for bio-impedance measurement. The impedance spectroscopy system includes a signal generator configured to generate a signal with a broadband frequency spectrum and to generate an analog injection current from the signal with the broadband frequency spectrum. The analog injection current has a high pass frequency characteristic. The impedance spectroscopy system also includes an amplifier configured to measure a voltage signal in response to the analog injection current and to simultaneously measure a biopotential signal. Further, the impedance spectroscopy system includes a processor configured to analyze the voltage signal to derive a bio-impedance spectrum as well to derive further information from the biopotential signal.

公开(公告)号：US11064454B2

公开(公告)日：2021-07-13

申请号：US16721351

申请日：2019-12-19

Applicant: Stichting IMEC Nederland

Inventor： Pouria Zand ,  Jac Romme

IPC: H04W64/00 ,  H04W72/04 ,  G01S13/84 ,  H04W74/04

Abstract: A method is disclosed for group ranging in a wireless network. The wireless network comprises a plurality of nodes, including an initiator node and a plurality of responder nodes. The method includes performing, for each frequency in a plurality of frequencies, a measurement procedure involving a two-way phase measurement between the initiator node and each of the responder nodes. The measurement procedure includes the initiator node transmitting a carrier signal having the frequency, each responder node of the plurality of responder nodes receiving and performing a phase measurement of the carrier signal, each responder node of the plurality of responder nodes transmitting a carrier signal having the frequency, and the initiator node receiving and performing a phase measurement of the carrier signal. The method further includes calculating, between the initiator node and each responder node of the plurality of responder nodes, a distance, based on the performed two-way phase measurements.

公开(公告)号：US20210194430A1

公开(公告)日：2021-06-24

申请号：US17128882

申请日：2020-12-21

Applicant: Stichting IMEC Nederland

Inventor： Johan van den Heuvel

IPC: H03C3/09 ,  H03L7/099 ,  H03L7/093

Abstract: A signal generator has a nominal frequency control input and a modulation frequency control input and comprises an oscillator, with a first set of capacitors at least partially switchably connectable for adjusting a frequency of the oscillator as part of a phase-locked loop, and a second set of capacitors comprised in a modulation stage of the oscillator, switchably connectable for modulating the frequency and controlled by the modulation frequency control input; a modulation gain estimation stage configured to determine a frequency-to-capacitor modulation gain; and a modulation range reduction module configured for clipping a modulation range of the oscillator to a range achievable using the second set of capacitors, using the modulation gain averaging out, in time, a phase error caused by the said clipping; and mimicking the said clipping, additively output to the nominal frequency control input to compensate said PLL for the said modulation.

公开(公告)号：US20210052169A1

公开(公告)日：2021-02-25

申请号：US16997908

申请日：2020-08-19

Applicant: Stichting IMEC Nederland

Inventor： Evelien HERMELING ,  Eva WENTINK

IPC: A61B5/02 ,  A61B5/021 ,  A61B5/022 ,  A61B5/0225 ,  A61B5/0402 ,  A61B5/053

Abstract: The present invention provides a method for assessing at least one parameter related to the microcirculation function of a person, said method comprising the steps of a) determining an arrival time (AT) of a pulse wave, wherein the AT is the time between the onset of an activity of the heart that produces said pulse wave and the arrival of said pulse wave in a part of the body of said person; b) varying an applied pressure (P) on said part of the body over time and determining said AT as a function of applied pressure and time; and c) assessing said at least one parameter related to the microcirculation function based on said determination of AT and said AT as a function of applied pressure and time in steps a) and b). The present invention further provides a system for assessing at least one parameter related to the microcirculation function of a person.

公开(公告)号：US10892710B2

公开(公告)日：2021-01-12

申请号：US16427933

申请日：2019-05-31

Applicant: Stichting IMEC Nederland

Inventor： Yue Chen ,  Masoud Babaie

IPC: H03B5/12

Abstract: An LC oscillator powering arrangement comprises an LC oscillator configured to provide an oscillating signal output; a current source configured to supply the LC oscillator with a supply current, the current source during operation being controlled by a control voltage and supplied with a supply voltage subject to supply voltage ripple; and a replication block configured to generate an amplified replica of the supply voltage ripple directly from the supply voltage and to overlay the replica on the control voltage.

公开(公告)号：US10862439B2

公开(公告)日：2020-12-08

申请号：US16222340

申请日：2018-12-17

Applicant: Stichting IMEC Nederland

Inventor： Elbert Bechthum ,  Ao Ba

IPC: H03F3/217 ,  H03F3/00 ,  H03F1/02 ,  H03F3/193 ,  H03F3/30 ,  H03F3/72

Abstract: A switched-capacitor power amplifier comprising a plurality of cells and methods for its operation are described. Switched signal lines switch supply to respective capacitors. Switches connect respective signal lines to a first supply and switches connect respective signal lines to a second supply. Pairs of switches on each signal line are switched so that one is switched off whilst the other is switched on. In a “full amplitude” mode, operation of the switches provides an output having a peak determined by the first supply. A switch signal line is provided between nodes in respective signal lines, a switch being provided in the switch signal line. In a “half amplitude” mode, switch is switched at the radio frequency in the other direction to that of switches connecting the signal lines to respective ones of the first and second supplies with the other switches being kept open.

公开(公告)号：US10709372B2

公开(公告)日：2020-07-14

申请号：US16217384

申请日：2018-12-12

Applicant: Stichting IMEC Nederland

Inventor： Valer Pop ,  Salvatore Polito

IPC: A61B5/20 ,  A61B5/11 ,  A61B5/07 ,  A61B5/00 ,  A61B5/1473 ,  A61B5/145

Abstract: According to one aspect of the inventive concept there is provided a system for monitoring incontinence comprising: a urine sensitive circuit arranged to present a changed electrical characteristic when exposed to urine; a measurement circuit arranged to perform a measurement on a urine bladder of a wearer to determine at least one parameter which varies with a fill level of the urine bladder; a sensor arranged to determine an orientation and/or a movement of the sensor; and a processing circuit arranged to: determine whether the urine sensitive circuit has been exposed to urine; estimate an amount of urine released on to the urine sensitive circuit; and in response to determining that the urine sensitive circuit has been exposed to urine, record data representing said at least one parameter determined by the measurement circuit, an estimated movement and/or posture of the wearer based on an orientation and/or a movement determined by the sensor, and an estimate of the amount of urine released on to the urine sensitive circuit.

公开(公告)号：US10694971B2

公开(公告)日：2020-06-30

申请号：US15689930

申请日：2017-08-29

Applicant: Stichting IMEC Nederland

Inventor： Jiawei Xu

IPC: A61B5/05 ,  A61B5/053 ,  A61B5/00 ,  H03F3/45 ,  A61B5/04 ,  A61B5/0408 ,  A61B5/0478

Abstract: According to an aspect of the present inventive concept there is provided a reconfigurable sensor circuit comprising: an input stage including a first input terminal and a second input terminal, and an amplification stage including: a first amplifier having a non-inverting input, an inverting input and an output connected to the inverting input of the first amplifier via a first resistor, a second amplifier having a non-inverting input, an inverting input and an output connected to the inverting input of the second amplifier via a second resistor, and first switching circuitry adapted to be arranged in a first state, wherein the amplification stage is in a differential amplifier configuration, and in a second state, wherein the amplification stage is in a transimpedance amplifier configuration, wherein, in the differential amplifier configuration, the first amplifier and the second amplifier are together configured as a differential amplifier connected to the first and the second input terminals, and wherein, in the transimpedance amplifier configuration, at least the first amplifier is configured as a transimpedance amplifier connected to the first input terminal.

公开(公告)号：US20200136628A1

公开(公告)日：2020-04-30

申请号：US16670394

申请日：2019-10-31

Applicant: Stichting IMEC Nederland

Inventor： Johan van den Heuvel ,  Paul Mateman

IPC: H03L7/099 ,  H03M1/82 ,  H03L1/00

Abstract: A signal generator comprises (i) a first set of capacitors at least partially switchably connectable for adjusting a frequency of an oscillator as part of a phase-locked loop and (ii) a second set of capacitors comprised in one or more oscillator control subsystems. A method of controlling the signal generator comprises: (i) acquiring a frequency lock in the phase-locked loop, (ii) calculating, in conjunction with the acquiring of the frequency lock, a systematic capacitance error of the first set of capacitors due to process, voltage, and temperature variations based on the frequency of the oscillator and a switching state of the first set of capacitors, and (iii) calibrating the one or more oscillator control subsystems using the systematic capacitance error, thereby compensating for process, voltage, and temperature variations common between the first set of capacitors and the second set of capacitors.