公开(公告)号：US11369275B2

公开(公告)日：2022-06-28

申请号：US16709908

申请日：2019-12-10

申请人： IMEC VZW ,  STICHTING IMEC NEDERLAND

发明人： Shuang Song ,  Jiawei Xu ,  Roland Van Wegberg ,  Nick Van Helleputte

IPC分类号： A61B5/0295 ,  A61B5/0205 ,  A61B5/1455 ,  A61B5/00 ,  A61B5/024

摘要： A device for read-out of a photoplethysmography (PPG) signal comprises: a photodiode, which is configured to detect a PPG signal, the photodiode comprising a first and a second terminal; and a read-out circuitry for reading out the PPG signal, wherein an input stage is connected to receive a first and a second input signal from the terminals and a DC bias voltage, and wherein the input stage is configured for current sensing to provide a fully differential amplification of the input signals to a first and a second current signal, and wherein an output stage is configured to receive the current signals, wherein the current signals comprise an AC and a DC component of the PPG signal, and wherein the output stage is configured to generate a differential output voltage through a gain component.

公开(公告)号：US20190192018A1

公开(公告)日：2019-06-27

申请号：US16173817

申请日：2018-10-29

申请人： IMEC VZW ,  STICHTING IMEC NEDERLAND

发明人： Yifan Zhang ,  Willemijn Groenendaal ,  Shuang Song ,  Rik Vullings

IPC分类号： A61B5/024 ,  A61B5/00

CPC分类号： A61B5/02416 ,  A61B5/02405 ,  A61B5/02438 ,  A61B5/6824 ,  A61B5/721 ,  A61B5/7246 ,  A61B5/725 ,  A61B5/7257 ,  A61B2562/0219

摘要： A method for time domain signal reconstruction for representing heart activity of a subject from a photoplethysmogram (PPG) signal comprises: receiving a PPG signal carrying information of heart activity of the subject; decomposing frequency information of the PPG signal into a plurality of components, each component having a frequency spectrum and a weight; for each component of the plurality of components: comparing the frequency spectrum of the component to a spectrum mask based on an estimate of heart rate of the subject; and adjusting the weight of the component based on the comparing; and reconstructing a time domain signal based on recombination of the plurality of components with adjusted weights.

公开(公告)号：US11864876B2

公开(公告)日：2024-01-09

申请号：US16886714

申请日：2020-05-28

申请人： IMEC VZW ,  Katholieke Universiteit Leuven ,  Stichting IMEC Nederland

发明人： Qiuyang Lin ,  Jiawei Xu ,  Shuang Song ,  Nick Van Helleputte ,  Filip Tavernier

IPC分类号： A61B5/024 ,  A61B5/00 ,  G01J1/44

CPC分类号： A61B5/02427 ,  A61B5/0042 ,  A61B5/0075 ,  A61B5/6826 ,  G01J1/44 ,  G01J2001/446

摘要： A light-to-digital converter (2) comprises a light-to-current converter (10); a current integrator (4) with an integrator output (30) resettable to a baseline level; and a counter (18) with a digital output (26), wherein the light-to-current converter (10) is switchably connectable as a positive integration input to the current integrator (4), for, during a light-collecting phase (404-406), integrating a current from the light-to-current converter (10), the integrator output (30) starting from the baseline value and ending at a value to be digitized; a reference current source (14) is switchably connectable as a negative integration input to the current integrator (4), for, during a counting phase (406-408) subsequent to the light-collecting phase (404-406), integrating a reference current from the reference current source (14), the integrator output (30) starting from the value to be digitized and ending at the baseline value, the time spent integrating the reference current corresponding to the value to be digitized; and the counter (18) is configured for measuring the time.

公开(公告)号：US11689209B2

公开(公告)日：2023-06-27

申请号：US17590211

申请日：2022-02-01

申请人： IMEC VZW ,  KATHOLIEKE UNIVERSITEIT LEUVEN ,  Stichting IMEC Nederland

发明人： Qiuyang Lin ,  Nick Van Helleputte ,  Roland Van Wegberg ,  Shuang Song

IPC分类号： H03M1/06

CPC分类号： H03M1/0604

摘要： An analog-to-digital converter, ADC, circuitry, comprises: an integrator connected to a capacitor, the integrator being configured to switch between integrating an analog input signal for ramping an integrator output and integrating a reference input signal for returning integrator output towards a threshold; a comparator for comparing integrator output to the threshold; and a timer for determining a time duration during which the reference input signal is integrated, the time duration providing a digital representation of an analog input signal value; the ADC circuitry further comprising a feedforward noise shaping loop configured to store a quantization error signal based on digitizing a first sample, the comparator being configured to receive a feedforward noise shaping signal for changing the threshold for digitizing a later sample of the analog input signal following the first sample.