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1. WO2020069941 - CAPACITANCE TO DIGITAL CONVERTER, INTEGRATED SENSOR INTERFACE AND SENSOR DEVICE

Publication Number WO/2020/069941
Publication Date 09.04.2020
International Application No. PCT/EP2019/075914
International Filing Date 25.09.2019
IPC
G01R 27/26 2006.01
GPHYSICS
01MEASURING; TESTING
RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
27Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
02Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
26Measuring inductance or capacitance; Measuring quality factor, e.g. by using the resonance method; Measuring loss factor; Measuring dielectric constants
G01R 31/312 2006.01
GPHYSICS
01MEASURING; TESTING
RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
31Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
28Testing of electronic circuits, e.g. by signal tracer
302Contactless testing
312by capacitive methods
G01D 5/24 2006.01
GPHYSICS
01MEASURING; TESTING
DMEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED BY A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; TRANSFERRING OR TRANSDUCING ARRANGEMENTS NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
5Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
12using electric or magnetic means
14influencing the magnitude of a current or voltage
24by varying capacitance
CPC
G01D 5/24
GPHYSICS
01MEASURING; TESTING
DMEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
5Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
12using electric or magnetic means
14influencing the magnitude of a current or voltage
24by varying capacitance
G01R 27/2605
GPHYSICS
01MEASURING; TESTING
RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
27Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
02Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
26Measuring inductance or capacitance; Measuring quality factor, e.g. by using the resonance method; Measuring loss factor; Measuring dielectric constants ; ; Measuring impedance or related variables
2605Measuring capacitance
G01R 31/312
GPHYSICS
01MEASURING; TESTING
RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
31Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
28Testing of electronic circuits, e.g. by signal tracer
302Contactless testing
312by capacitive methods
Applicants
  • AMS AG [AT]/[AT]
Inventors
  • SERRANO GOTARREDONA, Rafael
  • GARCIA GONZALEZ, Jose Manuel
Agents
  • EPPING HERMANN FISCHER PATENTANWALTSGESELLSCHAFT MBH
Priority Data
18198139.002.10.2018EP
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) CAPACITANCE TO DIGITAL CONVERTER, INTEGRATED SENSOR INTERFACE AND SENSOR DEVICE
(FR) CONVERTISSEUR CAPACITIF-NUMÉRIQUE, INTERFACE DE CAPTEUR INTÉGRÉE ET DISPOSITIF DE CAPTEUR
Abstract
(EN)
A capacitance to digital converter, CDC, has a first and a second reference terminal (T1, T2) for receiving first and second reference voltages (VREFP, VREFN), a reference block (GREF) comprising one or more reference charge stores and being coupled to the first and second reference terminals (T1, T2) via a first switching block (SWB1), a scaling block (SOB) for providing at third and fourth reference terminals (T3, T4) downscaled voltages (SVREFP, SVREFN) from the first and second reference voltages (VREFP, VREFN) depending on a scaling factor, first and second measurement terminals (M1, M2) for connecting a capacitive sensor element (CS), the first measurement terminal (Ml) being coupled to the third and fourth reference terminals (T3, T4) via a second switching block (SWB2), and a processing block (PROG) coupled to the reference block (GREF) and to the second measurement terminal (M2) and being configured to determine a digital output signal based on a charge distribution between the sensor element (CS) and the reference block and based on the scaling factor, the output signal representing a capacitance value of the sensor element (CS).
(FR)
L'invention concerne un convertisseur capacitif-numérique (CDC) comprenant une première et une deuxième borne de référence (T1. T2) permettant de recevoir des première et deuxième tensions de référence (VREFP, VREFN), un bloc de référence (GREF) comprenant une ou plusieurs mémoires de charge de référence et étant couplé aux première et deuxième bornes de référence (T1, T2) par l'intermédiaire d'un premier bloc de commutation (SWB1), un bloc de mise à l'échelle (SOB) permettant de fournir à des troisième et quatrième bornes de référence (T3, T4) des tensions à échelle réduite (SVREFP, SVREFN) à partir des première et deuxième tensions de référence (VREFP, VREFN) en fonction d'un facteur de mise à l'échelle, des première et deuxième bornes de mesure (M1, M2) permettant de connecter un élément de capteur capacitif (CS), la première borne de mesure (M1) étant couplée aux troisième et quatrième bornes de référence (T3, T4) par l'intermédiaire d'un deuxième bloc de commutation (SWB2), et un bloc de traitement (PROG) couplé au bloc de référence (GREF) et à la deuxième borne de mesure (M2) et étant conçu pour déterminer un signal de sortie numérique en fonction d'une distribution de charge entre l'élément de capteur (CS) et le bloc de référence et en fonction du facteur de mise à l'échelle, le signal de sortie représentant une valeur de capacité de l'élément de capteur (CS).
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