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.

公开(公告)号：US20240027263A1

公开(公告)日：2024-01-25

申请号：US18267062

申请日：2021-12-08

Applicant: ams International AG

Inventor： Ravi Kumar ADUSUMALLI ,  Rahul THOTTATHIL ,  Gowri Krishna Kanth AVALUR ,  Sudhakar SINGAMALA ,  Dinesh KURUGANTI ,  Vijay ELE

IPC: G01J1/44

CPC classification number: G01J1/44 ,  G01J2001/4247

Abstract: 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.