Patents by Inventor Pieter Rombouts

Pieter Rombouts has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 11604234
    Abstract: A sensor system for measuring a physical quantity includes: a bridge sensor having at least two terminal pairs, a current source for applying a bias current between the bias terminal pair, resulting in a differential sensor signal on a readout terminal pair, wherein the differential sensor signal is indicative for the physical quantity, and an amplifier comprising a first input node and a second input node for receiving the differential signal and at least one output node, wherein the amplifier is configured for amplifying the differential sensor signal and putting the resulting signal on the at least one output node, wherein the sensor system is configured such that, in operation, the amplifier is powered by at least part of the bias current.
    Type: Grant
    Filed: November 10, 2021
    Date of Patent: March 14, 2023
    Assignee: MELEXIS TECHNOLOGIES NV
    Inventors: Johan Raman, Pieter Rombouts
  • Patent number: 11428549
    Abstract: A position sensing device for measuring a position, comprises a position sensing device for measuring a position; a plurality of sensors arranged to produce sense signals each being a function of an input phase representative of a position to be measured; a combiner circuit arranged to generate an error signal by combining the sense signals according to an array of weight factors; a processing block including a loop filter to filter the error signal and arranged to output a phase value representative of the position; and a feedback loop comprising a feedback signal unit arranged for receiving the output phase value and for adjusting based on the received output phase value of the array of weight factors.
    Type: Grant
    Filed: January 24, 2019
    Date of Patent: August 30, 2022
    Assignee: MELEXIS TECHNOLOGIES SA
    Inventors: Johan Raman, Gael Close, Pieter Rombouts
  • Patent number: 11255696
    Abstract: A circuit for biasing and reading out a bridge sensor structure comprises at least two pairs of connection terminals. The circuit comprises an excitation signal generator for generating an excitation signal for biasing and/or exciting the bridge, in which the excitation signal is provided as a non-constant periodic continuous function of time, and a detection circuit for obtaining the sensor signal from the bridge sensor structure by electrically connecting the detection circuit to any pair of connection terminals while applying the excitation signal to another pair. The circuit comprises a switch unit for switching the electrical excitation signal and for switching the detection circuit. A controller controls the switch unit to switch the first pair from being connected to the excitation signal generator at a time when the generated excitation signal is in a predetermined signal range where the excitation signal value is substantially equal to zero.
    Type: Grant
    Filed: April 25, 2018
    Date of Patent: February 22, 2022
    Assignee: MELEXIS TECHNOLOGIES SA
    Inventors: Johan Raman, Pieter Rombouts
  • Patent number: 10892723
    Abstract: A semiconductor amplifier circuit comprising an input block adapted for receiving a voltage signal to be amplified, an integrator circuit having an integrating capacitor providing a continuous-time signal representative for the integral of the voltage signal, a first feedback path comprising: a sample-and-hold block and a first feedback block, the first feedback path providing a proportional feedback signal upstream of the current integrator. The amplification factor is larger than 1 for a predefined frequency range. Charge stored on the integrating capacitor at the beginning of a sample period is linearly removed during one single sampling period in such a way that the absolute value of the charge is smaller at the end of the sampling period than at the beginning of the sample period when the voltage signal to be amplified is equal to zero.
    Type: Grant
    Filed: October 31, 2018
    Date of Patent: January 12, 2021
    Assignee: Melexis Technologies SA
    Inventors: Johan Raman, Pieter Rombouts
  • Patent number: 10739418
    Abstract: A method of reading out a Hall plate which comprises at least 4 contacts. The method comprises: reading out two of the contacts while biasing two other contacts of the at least 4 contacts thereby obtaining a readout signal; switching biasing and readout contacts according to a random or pseudo-random sequence of phases, each phase corresponding with a different permutation of biasing and readout contacts selected from the at least 4 contacts of the Hall plate wherein the biasing and readout contacts are selected such that the readout signal is a measure for the magnetic field; processing of the readout signal to obtain a readout of the Hall plate representative for the magnetic field.
    Type: Grant
    Filed: July 5, 2019
    Date of Patent: August 11, 2020
    Assignee: Melexis Technologies SA
    Inventors: Johan Raman, Pieter Rombouts
  • Patent number: 10698009
    Abstract: A method of biasing and reading-out a passive resistive sensor structure having two excitation nodes and two readout nodes, comprises the steps of: a) determining a first state of a first capacitor corresponding to a first amount of charge biasing the sensor structure such that a biasing current flows through said first capacitor during a first time interval determining a second state of the first capacitor corresponding to a second amount of charge integrating or averaging the readout signal during a second time interval related to the first time interval, thereby obtaining an integrated or averaged readout signal determining the sensor readout signal based on the integrated or averaged readout signal and a change in state of the first capacitor.
    Type: Grant
    Filed: February 1, 2018
    Date of Patent: June 30, 2020
    Assignee: Melexis Technologies SA
    Inventors: Johan L. Raman, Pieter Rombouts
  • Patent number: 10554219
    Abstract: An analog-to-digital converter comprises a first quantizer arranged for yielding a first digital signal; an error signal generation block arranged for generating an error signal representative of a difference between an analog input signal and the first digital signal; an analog loop filter arranged for receiving the error signal; a second quantizer arranged for receiving an output signal of the analog loop filter and for outputting a second digital signal; a digital loop filter arranged for receiving the second digital signal and for providing an input signal to the first quantizer; and a recombiner block comprising a first recombination and a second recombination filter, and an adder circuit for adding outputs of the first and second recombination filters. The first and second recombination filters are selected to obtain an analog-to-digital converted output signal being less dependent on quantization noise caused by the first quantizer than a first digital signal.
    Type: Grant
    Filed: April 9, 2019
    Date of Patent: February 4, 2020
    Assignee: MELEXIS TECHNOLOGIES SA
    Inventors: Johan Raman, Pieter Rombouts
  • Patent number: 10491236
    Abstract: An offset compensation circuit comprises an error signal generation block arranged for receiving an input phase and an output phase, and for generating an error signal indicative of an error between the input phase and the output phase. Means are provided for combining the error signal with an offset compensation signal, yielding an offset compensated signal. A loop filter is arranged for receiving the offset compensated signal and for outputting the output phase. An offset compensation block is arranged for receiving the output phase and for determining the offset compensation signal. The offset compensation signal comprises at least a contribution proportional to a periodic function of the output phase.
    Type: Grant
    Filed: February 15, 2019
    Date of Patent: November 26, 2019
    Assignee: MELEXIS TECHNOLOGIES SA
    Inventors: Johan Raman, Pieter Rombouts
  • Patent number: 10345394
    Abstract: A method for providing offset compensation in a Hall sensor comprising at least one Hall element having a plate-shaped sensor element made of a doped semiconductor material, comprises using measurements on the Hall element itself. The method comprises obtaining a first readout signal (VH) from the at least one Hall element which is substantially dependent on the magnetic field, obtaining a second readout signal (VP) from the at least one Hall element which is substantially independent of the magnetic field, and using the second readout signal (VP) for obtaining a prediction ({circumflex over (V)}O) of the offset (VO) on the first readout signal (VH).
    Type: Grant
    Filed: November 6, 2014
    Date of Patent: July 9, 2019
    Assignee: MELEXIS TECHNOLOGIES NV
    Inventors: Johan Raman, Pieter Rombouts
  • Patent number: 10148237
    Abstract: A semiconductor circuit comprising an input block having a first chopper providing a chopped voltage signal, a first transconductance converting said chopped voltage signal into a chopped current signal, a second chopper providing a demodulated current signal, a current integrator having an integrating capacitor providing a continuous-time signal, a first feedback path comprising: a sample-and-hold block and a first feedback block, the first feedback path providing a proportional feedback signal upstream of the current integrator. The amplification factor is at least 2. Charge stored on the integrating capacitor at the beginning of a sample period is linearly removed during one single sampling period. Each chopper operates at a chopping frequency. The sample-and-hold-block operates at a sampling frequency equal to an integer times the chopping frequency.
    Type: Grant
    Filed: January 10, 2017
    Date of Patent: December 4, 2018
    Assignee: MELEXIS TECHNOLOGIES SA
    Inventors: Johan Raman, Pieter Rombouts
  • Patent number: 10067173
    Abstract: A method for reading out a sensor unit having a first set of nodes and a second set of nodes and a symmetry which allows different configurations of excitation and sensing lead to a same readout. The method includes changing the readout configuration of the sensor unit by exchanging excitation and sensing between the first set of nodes and the second set of nodes, evaluating the similarity or deviation between measurement signals obtained in different readout configurations of the sensor unit, raising an error if the measurement signals differ more from one another than a predetermined value.
    Type: Grant
    Filed: August 18, 2017
    Date of Patent: September 4, 2018
    Assignee: MELEXIS TECHNOLOGIES SA
    Inventors: Johan Raman, Pieter Rombouts
  • Patent number: 9977064
    Abstract: A difference measurement circuit having a first port and a second port for connection to a first set of nodes and a second set of nodes of a sensor unit. The circuit further has switching units for switching excitation signals emanating from excitation nodes from being applied to the first set of nodes (A, B) via the first port to being applied to the second set of nodes via the second port and for switching differential measurement signals measured at sensing nodes from being obtained from the second set of nodes via the second port to being obtained from the first set of nodes via the first port. The circuit further includes redundancy testing circuitry for evaluating the similarity or deviation between measurement signals obtained in different states of the switching units.
    Type: Grant
    Filed: August 18, 2017
    Date of Patent: May 22, 2018
    Assignee: MELEXIS TECHNOLOGIES SA
    Inventors: Johan Raman, Pieter Rombouts
  • Patent number: 9857247
    Abstract: A method determines isotropic stress by means of a Hall element which includes a plate-shaped area made of a doped semiconductor material and comprises four contacts contacting the plate-shaped area and forming corners of a quadrangle, two neighboring corners of the quadrangle defining an edge thereof. At least one van der Pauw transresistance value in at least one van der Pauw measurement set-up of the Hall element is determined, wherein the four contacts of the Hall element form contact pairs, a contact pair comprising two contacts defining neighboring corners of the quadrangle. One contact pair supplies a current and the other contact pair measures a voltage. A relationship between the supplied current and the measured voltage defines the Van der Pauw transresistance value. The method comprises determining a stress signal which depends on the at least one Van der Pauw transresistance value and determining isotropic stress.
    Type: Grant
    Filed: May 7, 2013
    Date of Patent: January 2, 2018
    Assignee: MELEXIS TECHNOLOGIES NV
    Inventors: Samuel Huber, Johan Raman, Pieter Rombouts, Appolonius Jacobus Van Der Wiel
  • Patent number: 9766280
    Abstract: A difference measurement circuit including a first port and a second port for connection to a first set of nodes and a second set of nodes of a sensor unit. The circuit further includes switching units for switching excitation signals emanating from excitation nodes from being applied to the first set of nodes via the first port to being applied to the second set of nodes via the second port and for switching differential measurement signals measured at sensing nodes from being obtained from the second set of nodes via the second port to being obtained from the first set of nodes via the first port. A corresponding method is described. The circuit further includes redundancy testing circuitry for evaluating the similarity or deviation between measurement signals obtained in different states of the switching units.
    Type: Grant
    Filed: November 29, 2016
    Date of Patent: September 19, 2017
    Assignee: MELEXIS TECHNOLOGIES N.V.
    Inventors: Johan Raman, Pieter Rombouts
  • Patent number: 9535103
    Abstract: A difference measurement circuit including a first port and a second port for connection to a first set of nodes and a second set of nodes of a sensor unit. The circuit further includes switching units for switching excitation signals emanating from excitation nodes from being applied to the first set of nodes via the first port to being applied to the second set of nodes via the second port and for switching differential measurement signals measured at sensing nodes from being obtained from the second set of nodes via the second port to being obtained from the first set of nodes via the first port. A corresponding method is described. The circuit further includes redundancy testing circuitry for evaluating the similarity or deviation between measurement signals obtained in different states of the switching units.
    Type: Grant
    Filed: April 10, 2012
    Date of Patent: January 3, 2017
    Assignee: MELEXIS TECHNOLOGIES N.V.
    Inventors: Johan Raman, Pieter Rombouts
  • Publication number: 20160252589
    Abstract: A method for providing offset compensation in a Hall sensor comprising at least one Hall element having a plate-shaped sensor element made of a doped semiconductor material, comprises using measurements on the Hall element itself. The method comprises obtaining a first readout signal (VH) from the at least one Hall element which is substantially dependent on the magnetic field, obtaining a second readout signal (VP) from the at least one Hall element which is substantially independent of the magnetic field, and using the second readout signal (VP) for obtaining a prediction ({circumflex over (V)}O) of the offset (VO) on the first readout signal (VH).
    Type: Application
    Filed: November 6, 2014
    Publication date: September 1, 2016
    Inventors: Johan Raman, Pieter Rombouts
  • Patent number: 9170308
    Abstract: Circuit and method for biasing a plate-shaped sensor element (2) made of doped semiconductor material and having a first resp. second excitation contact (C, A) connected to a first resp. second excitation node (Cn, An), and a first resp. second sense contact (B, D) connected to a first resp. second sense node (Bn, Dn). The plate-shaped sensor element is electrically isolated from a substrate or well (5) by means of a first PN-junction.
    Type: Grant
    Filed: October 16, 2013
    Date of Patent: October 27, 2015
    Assignee: MELEXIS TECHNOLOGIES N.V.
    Inventors: Johan Raman, Pieter Rombouts
  • Publication number: 20150142342
    Abstract: A method determines isotropic stress by means of a Hall element which includes a plate-shaped area made of a doped semiconductor material and comprises four contacts contacting the plate-shaped area and forming corners of a quadrangle, two neighboring corners of the quadrangle defining an edge thereof. At least one van der Pauw transresistance value in at least one van der Pauw measurement set-up of the Hall element is determined, wherein the four contacts of the Hall element form contact pairs, a contact pair comprising two contacts defining neighbouring corners of the quadrangle. One contact pair supplies a current and the other contact pair measures a voltage. A relationship between the supplied current and the measured voltage defines the Van der Pauw transresistance value. The method comprises determining a stress signal which depends on the at least one Van der Pauw transresistance value and determining isotropic stress.
    Type: Application
    Filed: May 7, 2013
    Publication date: May 21, 2015
    Inventors: Samuel Huber, Johan Raman, Pieter Rombouts, Appolonius Jacobus Van Der Wiel
  • Patent number: 8464585
    Abstract: A MEMS structure for a combined gyroscope and accelerometer unit (100) based on in-plane vibratory movements comprises a proof mass (101) and comb-drives (102) operable to cause the proof mass (101) to resonate in the x-direction, commonly referred to as the primary mode. Under the influence of a rotation ?z around the z-axis, a Coriolis force acting in the y-direction results. This excites the secondary (or sense) mode. A set of parallel-plate capacitors 103 are provided to enable position readout along the secondary axis. In addition to the above, the comb-drive capacitors (102) of the primary mode can also be used for readout of position along the primary axis, and the parallel-plate capacitors (103) for actuation along the secondary axis. This can be achieved either by time-multiplexing these capacitors (102, 103) or by providing separate sets of capacitors (102, 103) for sensing and actuation along each axis. The unit can operate in separate ?? force-feedback loops with respect to both axes.
    Type: Grant
    Filed: October 20, 2008
    Date of Patent: June 18, 2013
    Assignees: Melexis Technologies NV, Universiteit Gent
    Inventors: Johan Raman, Pieter Rombouts
  • Publication number: 20100307241
    Abstract: A MEMS structure for a combined gyroscope and accelerometer unit (100) based on in-plane vibratory movements comprises a proof mass (101) and comb-drives (102) operable to cause the proof mass (101) to resonate in the x-direction, commonly referred to as the primary mode. Under the influence of a rotation ?z around the z-axis, a Coriolis force acting in the y-direction results. This excites the secondary (or sense) mode. A set of parallel-plate capacitors 103 are provided to enable position readout along the secondary axis. In addition to the above, the comb-drive capacitors (102) of the primary mode can also be used for readout of position along the primary axis, and the parallel-plate capacitors (103) for actuation along the secondary axis. This can be achieved either by time-multiplexing these capacitors (102, 103) or by providing separate sets of capacitors (102, 103) for sensing and actuation along each axis. The unit can operate in separate ?? force-feedback loops with respect to both axes.
    Type: Application
    Filed: October 20, 2008
    Publication date: December 9, 2010
    Applicants: MELEXIS NV, UNIVERSITEIT GENT
    Inventors: Johan Raman, Pieter Rombouts