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公开(公告)号：US20220393697A1
公开(公告)日：2022-12-08
申请号：US17774854
申请日：2020-12-18
申请人： ams International AG
摘要： A sensor circuit comprising a sensor input includes a delta-sigma analogue to digital converter. The delta-sigma analogue to digital converter includes a switched capacitor, a common mode voltage source, a reference voltage source, and a switch network. The switch network, in a first clock phase, connects the switched capacitor to charge it to either a sum or difference voltage, and in a second clock phase connects the switched capacitor to transfer charge into a summing junction. A controller controls the switch network responsive to a comparator output to selectively connect the switched capacitor to one of the common mode voltage and the reference voltage in the first clock phase. Implementations of the sensor circuit transfer charge every clock cycle and have low noise and high sensitivity.
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公开(公告)号：US20230266464A1
公开(公告)日：2023-08-24
申请号：US18005229
申请日：2021-06-15
申请人： ams International AG
CPC分类号： G01S17/04 , G01S7/484 , G01S7/4873 , H04M1/21
摘要： A proximity detection system for a mobile device. The system includes an infrared emitter to emit infrared light, an infrared detector to detect the infrared light after reflection from a target and provide a detector signal; and a signal processing subsystem. The signal processing subsystem is configured to control the proximity detection system into a first, detect mode for detecting proximity of the target as the target approaches the mobile device, and after detection of the target to control the proximity detection system into a second, release mode for detecting movement of the target out of proximity to the mobile device. The signal processing subsystem also controls the proximity detection system such that, contrary to conventional hysteresis, for a given proximity of the target the detector signal reduces when the mode switches from the detect mode to the release mode, thus increasing reliability.
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公开(公告)号：US20210343205A1
公开(公告)日：2021-11-04
申请号：US17271309
申请日：2019-08-19
申请人： ams International AG
摘要： A temperature sensor arrangement includes a current integrating modulator that provides a count value dependent on the current supplied to its input terminal. A temperature-sensitive element includes a resistor to generate a current dependent on temperature. First and second switches alternately connect the temperature-sensitive element and another resistor to the input terminal of the current integrating modulator. The temperature sensor arrangement can be combined with an ambient light sensor sharing the current integrating modulator.
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公开(公告)号：US20200033284A1
公开(公告)日：2020-01-30
申请号：US16337498
申请日：2017-09-06
申请人： ams International AG
发明人： Rohit RANGANATHAN , Sanjeev Praphulla Chandra NYSHADHAM , Krishna Kanth AVALUR , Ravi Kumar ADUSUMALLI , Prasad PONNADA
IPC分类号： G01N27/12
摘要： A measurement circuitry (MC) for evaluating a resistance of a resistive gas sensor (GS) comprises a first current path (P1), wherein a first logarithmic compression circuit (LC1) is arranged in the first current path (P1). A reference resistor (Rreference) and a second logarithmic compression circuit (LC2) is arranged in a second current path (P2) of the measurement circuitry (MC). A voltage generator (VG) provides a fixed voltage excitation for the resistive gas sensor (GS) and the reference resistor (Rreference). A first current (I1) received from the resistive gas sensor (GS) flows from the gas sensor (GS) via the first current path (P1) into the first logarithmic compression circuit (LC1). An evaluation circuit (EC) determines the resistance (Rs) of the resistive gas sensor (GS) in dependence on a first and second output signal (Ve1, Ve2) of the first and the second logarithmic compression circuit (LC1, LC2).
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公开(公告)号：US20240027263A1
公开(公告)日：2024-01-25
申请号：US18267062
申请日：2021-12-08
申请人： ams International AG
发明人： Ravi Kumar ADUSUMALLI , Rahul THOTTATHIL , Gowri Krishna Kanth AVALUR , Sudhakar SINGAMALA , Dinesh KURUGANTI , Vijay ELE
IPC分类号： G01J1/44
CPC分类号： G01J1/44 , G01J2001/4247
摘要： An optical device for characterizing flicker from an ambient light source is disclosed. The device comprises a radiation-sensitive device configured to vary a current in response to incident radiation, a second or higher-order modulator configured to output data corresponding to the current, and processing circuitry configured to provide a real-time characterization of flicker in the incident radiation based upon an analysis of changes in the data. Also disclosed is an associated method of characterizing flicker from an ambient light source.
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公开(公告)号：US20220255536A1
公开(公告)日：2022-08-11
申请号：US17618439
申请日：2020-06-09
申请人： AMS INTERNATIONAL AG
摘要： An apparatus includes a differential current-to-voltage conversion circuit that includes an input sampling stage circuit, a differential integration and DC signal cancellation stage circuit, and an amplification and accumulator stage circuit. An input common mode voltage of the differential current-to-voltage circuit is independent of an output common mode voltage of the differential current-to-voltage circuit.
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公开(公告)号：US20210190712A1
公开(公告)日：2021-06-24
申请号：US17055898
申请日：2019-05-16
申请人： ams International AG
摘要： A sensor arrangement includes a switchable voltage source having a source output for alternatively providing a first and a second excitation voltage, an integrator having an integrator input and an integrator output, a sensor resistor having a first terminal coupled to the source output, a reference resistor having a first terminal coupled to a second terminal of the sensor resistor and a second terminal coupled to the integrator input, and a comparator having a first comparator input coupled to the integrator output.
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