公开(公告)号：US20220139476A1

公开(公告)日：2022-05-05

申请号：US17433585

申请日：2020-02-25

Applicant: ams International AG

Inventor： Gowri Krishna Kanth Avalur ,  Rahul Thottathil ,  Ravi Kumar Adusumalli

IPC: G11C27/02 ,  H01L27/148 ,  H03K17/687 ,  G01J1/44

Abstract: A switch circuit for use in a single-ended switched-capacitor circuit for front-end circuitry of a sensor device is disclosed. The switch circuit comprises a first transistor and a second transistor having a same channel-type as the first transistor. A first node is connected to a source of the first transistor and a drain of the second transistor and a second node is connected to a drain of the first transistor and a source of the second transistor. Also disclosed is a sampling circuit comprising the switch circuit and a sampling capacitor, wherein the switch circuit is configurable to electrically couple the sampling capacitor to an integrator circuit or to a voltage reference. An integrated circuit device and a light to frequency converter or light sensor comprising the switch circuit is also disclosed.

公开(公告)号：US11996818B2

公开(公告)日：2024-05-28

申请号：US17618439

申请日：2020-06-09

Applicant: AMS INTERNATIONAL AG

Inventor： Rahul Thottathil ,  Ravi Kumar Adusumalli ,  Parvathy S. J. ,  Veeresh Babu Vulligaddala

IPC: H03M1/12 ,  H03F3/45 ,  H03H19/00 ,  H03K3/012 ,  H03K3/013

CPC classification number: H03H19/004 ,  H03F3/45475 ,  H03K3/012 ,  H03K3/013 ,  H03F2203/45514 ,  H03F2203/45551

Abstract: 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 conversion circuit is independent of an output common mode voltage of the differential current-to-voltage conversion circuit.

公开(公告)号：US11852525B2

公开(公告)日：2023-12-26

申请号：US17774854

申请日：2020-12-18

Applicant: ams International AG

Inventor： Ravi Kumar Adusumalli ,  Rahul Thottathil ,  Gowri Krishna Kanth Avalur ,  Sudhakar Singamala

IPC: G01J1/42 ,  G01J1/18 ,  G01J1/46 ,  H03M3/00 ,  G01J1/44

CPC classification number: G01J1/4204 ,  G01J1/18 ,  G01J1/46 ,  H03M3/368 ,  H03M3/458 ,  G01J2001/446

Abstract: An ambient light sensor is provided that includes a sensor input having 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. In a first clock phase, the switch network connects the switched capacitor to charge it to either a sum or difference voltage. In a second clock phase, the switch network connects the switched capacitor to transfer charge into a summing junction. A controller controls the switch network in response to a comparator output to connect the switched capacitor to either the common mode voltage or the reference voltage while in the first clock phase.

公开(公告)号：US11670392B2

公开(公告)日：2023-06-06

申请号：US17433585

申请日：2020-02-25

Applicant: ams International AG

Inventor： Gowri Krishna Kanth Avalur ,  Rahul Thottathil ,  Ravi Kumar Adusumalli

IPC: G11C27/02 ,  G01J1/44 ,  H01L27/148 ,  H03K17/687

CPC classification number: G11C27/026 ,  G01J1/44 ,  H01L27/14812 ,  H03K17/6871

Abstract: A switch circuit for use in a single-ended switched-capacitor circuit for front-end circuitry of a sensor device is disclosed. The switch circuit comprises a first transistor and a second transistor having a same channel-type as the first transistor. A first node is connected to a source of the first transistor and a drain of the second transistor and a second node is connected to a drain of the first transistor and a source of the second transistor. Also disclosed is a sampling circuit comprising the switch circuit and a sampling capacitor, wherein the switch circuit is configurable to electrically couple the sampling capacitor to an integrator circuit or to a voltage reference. An integrated circuit device and a light to frequency converter or light sensor comprising the switch circuit is also disclosed.

公开(公告)号：US20220393697A1

公开(公告)日：2022-12-08

申请号：US17774854

申请日：2020-12-18

Applicant: ams International AG

Inventor： Ravi Kumar ADUSUMALLI ,  Rahul Thottathil ,  Gowri Krishna Kanth Avalur ,  Sudhakar SINGAMALA

IPC: H03M3/00 ,  G01J1/46 ,  G01J1/42 ,  G01J1/18

Abstract: 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.