公开(公告)号：US20230268955A1

公开(公告)日：2023-08-24

申请号：US18160474

申请日：2023-01-27

Applicant: Stichting IMEC Nederland

Inventor： Yao-Hong Liu ,  Minyoung Song

IPC: H04B1/7176

CPC classification number: H04B1/7176

Abstract: A method of generating an impulse for impulse radio transmission signals and an impulse-radio ultra-wideband transmitter are provided. In one aspect, the method includes distributing input digital data according to time information data and amplitude information data along a first modulation path and a second modulation path, respectively. Pulse position modulation is performed based on the time information data along the first modulation path to define a timing position of the impulse. Pulse amplitude modulation is performed based on the amplitude information data along the second modulation path to define an envelope of the impulse. The input digital data can be distributed according to phase information data along a third modulation path, and phase shift keying modulation can be performed based on the phase information data along the third modulation path to define a phase of a carrier signal of the impulse.

公开(公告)号：US11689209B2

公开(公告)日：2023-06-27

申请号：US17590211

申请日：2022-02-01

Applicant: IMEC VZW ,  KATHOLIEKE UNIVERSITEIT LEUVEN ,  Stichting IMEC Nederland

Inventor： Qiuyang Lin ,  Nick Van Helleputte ,  Roland Van Wegberg ,  Shuang Song

IPC: H03M1/06

CPC classification number: H03M1/0604

Abstract: 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.

公开(公告)号：US11684772B2

公开(公告)日：2023-06-27

申请号：US17318005

申请日：2021-05-12

Applicant: Stichting IMEC Nederland

Inventor： Vojkan Mihajlovic

IPC: A61N1/36 ,  A61N1/04 ,  G06F3/01 ,  A61N1/08

CPC classification number: A61N1/0456 ,  A61N1/0476 ,  A61N1/36034 ,  G06F3/015 ,  A61N2001/083

Abstract: An electrode (10) for transcranial current stimulation is provided. The electrode (10) comprises at least two pins (11a, 11b) for contacting the skin of a living or human being, and a current delivering unit (12) connected to the at least two pins (11a, 11b). The current delivering unit (12) is configured to estimate the corresponding range of the respective contact impedance with respect to the skin for each of the at least two pins (11a, 11b) or to analyze the corresponding level of the respective contact impedance with respect to the skin for each of the at least two pins (11a, 11b). The current delivering unit (12) is configured to distribute a desired current over all of the at least two pins (11a, 11b) or to select a set of the at least two pins (11a, 11b) for delivering a set of partial currents in order to achieve the desired current.

公开(公告)号：US11559220B2

公开(公告)日：2023-01-24

申请号：US16784235

申请日：2020-02-06

Applicant: IMEC VZW ,  STICHTING IMEC NEDERLAND

Inventor： Hyunsoo Ha ,  Nick Van Helleputte

IPC: A61B5/053 ,  A61B5/0245 ,  A61B5/08 ,  A61B5/00

Abstract: A measurement unit for measuring a bio-impedance of a body, the measurement unit comprising a current generator circuit, a readout circuit, and a baseline cancellation current circuit, wherein the current generator circuit is configured to amplify a reference current to form a measurement current to be driven through a body to generate a measurement voltage representing the bio-impedance; wherein the readout circuit comprises a Instrumentation amplifier (IA) which has a transconductance stage and a transimpedance stage, wherein the IA is configured to: produce a first current in the transconductance stage, the first current being proportional to the measurement voltage, receive a second current from the baseline cancellation current circuit, produce an output voltage in the transimpedance stage, the output voltage being proportional to a difference between the first current and the second current and representative of the measured bio-impedance; wherein the baseline cancellation current circuit is configured to amplify the reference current by a factor to form the second current and deliver it to the IA, wherein the factor is such that that the absolute value of the difference between the first and the second current is below a threshold such that a baseline of the first current is cancelled by the second current.

公开(公告)号：US11480654B2

公开(公告)日：2022-10-25

申请号：US16789757

申请日：2020-02-13

Applicant: Stichting IMEC Nederland

Inventor： Yao-Hong Liu ,  Marco Mercuri

IPC: G01S7/03 ,  G01S7/34 ,  G01S13/12 ,  G01S13/58

Abstract: Example embodiments relate to radar transceivers. One embodiment includes a radar transceiver. The radar transceiver includes a chirp generator for generating a chirp having an initial frequency and a final frequency. The radar transceiver also includes a controllable variable gain amplifier having an input connected to an output of the chirp generator. Further, the radar transceiver includes a control unit connected to a control input on the chirp generator and to a control input on the controllable variable gain amplifier. The control unit is adapted to output a first control signal to the chirp generator such that the chirp generator starts generating the chirp. The control unit is also adapted to output a second control signal to the controllable variable gain amplifier such that the controllable variable gain amplifier starts increasing an amplification in the controllable variable gain amplifier from a first amplification level to a second amplification level.

公开(公告)号：US11463232B2

公开(公告)日：2022-10-04

申请号：US17142214

申请日：2021-01-05

Applicant: Stichting IMEC Nederland

Inventor： Ming Ding ,  Yao-Hong Liu

IPC: H04L7/00

Abstract: A system is provided for generating a time reference in duty-cycled wireless communications. The system includes at least one master module including a master transceiver adapted to transmit data packets. The system further includes at least one slave module including a slave transceiver adapted to receive the data packets. The slave module further includes a signal generator adapted to generate a clock signal with a period equal to the time interval of two data packets transmitted by the master module. Moreover, the slave module further includes a slave timer adapted to utilize the clock signal as a time reference in order to perform the sleep/wakeup control for the slave module.

公开(公告)号：US20220216879A1

公开(公告)日：2022-07-07

申请号：US17563635

申请日：2021-12-28

Applicant: Stichting IMEC Nederland

Inventor： Ming Ding ,  Martijn Timmermans ,  Pieter Harpe

IPC: H03M1/10

Abstract: Example embodiments relate to systems and methods for analog-to-digital signal conversion. One embodiment includes a system for analog-to-digital signal conversion. The system includes an analog input signal. The system also includes a digital-to-analog converter configured to generate a reference signal. Further, the system includes an amplifier configured to amplify an error signal that includes a difference between the analog input signal and the reference signal. Additionally, the system includes a level-crossing based sampling circuit that includes a first comparator configured to compare the error signal with respect to a first reference level, and a second comparator configured to compare the error signal with respect to a second reference level, thereby generating event-based reset signals corresponding to a plurality of sampling instances in order to reset the digital-to-analog converter. Yet further, the system includes a trigger circuit configured to generate reset signals asynchronous to the event-based reset signals.

公开(公告)号：US20220178982A1

公开(公告)日：2022-06-09

申请号：US17546722

申请日：2021-12-09

Applicant: Stichting IMEC Nederland

Inventor： Chengyao Shi ,  Yao-Hong Liu

IPC: G01R29/08 ,  H01Q1/27 ,  H04B5/00 ,  H01Q1/24

Abstract: An implantable device for detecting an antenna misalignment with respect to a transmitting implantable device in a near field communication system comprises an antenna unit configured to receive signals through a body channel from the transmitting implantable device. The antenna unit comprises at least two pairs of electrodes configured to cover a blind angle of a radiation pattern of the transmitting implantable device. The implantable device further comprises a processing unit electrically coupled to the antenna unit and configured to detect the antenna misalignment of the at least two pairs of electrodes with respect to the transmitting implantable device.

公开(公告)号：US20220140860A1

公开(公告)日：2022-05-05

申请号：US17518873

申请日：2021-11-04

Applicant: Stichting IMEC Nederland

Inventor： Erwin Allebes ,  Johan van den Heuvel ,  Gaurav Singh

IPC: H04B1/717 ,  H04L27/36 ,  H04L25/03

Abstract: A polar transmitter is provided. The polar transmitter includes a baseband generation unit configured to generate phase data bits and amplitude data bits of an output pulse. The polar transmitter further includes a bandwidth control unit downstream to the baseband generation unit configured to regulate the width of the output pulse. Moreover, the polar transmitter includes a pulse shaping unit downstream to the bandwidth control unit configured to generate a predefined amplitude envelope of the output pulse. In this context, the pulse shaping unit includes a delay-line with a plurality of taps, where each tap output is configured to be amplitude weighted in order to generate the amplitude envelope of the output pulse.

公开(公告)号：US11184047B2

公开(公告)日：2021-11-23

申请号：US16911938

申请日：2020-06-25

Applicant: Stichting IMEC Nederland

Inventor： Minyoung Song ,  Yao-Hong Liu

IPC: H04B1/40 ,  H04B1/10 ,  H04L25/02

Abstract: Example embodiments relate to methods for adjusting an impedance of a tunable matching network, One embodiment includes a method for adjusting an impedance of a tunable matching network (TMN) connected between an antenna and a transceiver front-end. The TMN includes a receive path to provide signals from the antenna to a receiver during a receive (Rx) mode and a transmit path to provide signals from a transmitter to the antenna during a transmit (Tx) mode. The method includes tuning the TMN. The method also includes measuring values of an output DC-offset at the receiver while tuning the TMN. The output DC-offset is caused by a coupling between the transmitter and the receiver. Further, the method includes determining a maximum value of the output DC-offset from the measured output DC-offset values. Additionally, the method includes adjusting the impedance of the TMN by tuning the TMN to the output DC-offset maximum value.