Patent ID: 11913831
Assignee: STMICROELECTRONICS (RESEARCH & DEVELOPMENT) LIMITED
Field: Audio-visual technology (Electrical engineering)
Classification: CPC G  H | IPC G  H

Claim 8:
9. An optical sensor comprising:
a first photodetector, wherein a first terminal of the first photodetector is coupled to a first voltage supply node;
a first control circuit comprising a first pull down circuit and a first pull up circuit, wherein the first pull down circuit is coupled between a second terminal of the first photodetector and a first reference voltage node, wherein the first reference voltage node is configured to be coupled to a first reference voltage that varies during a shot cycle of a photoemitter, wherein the first pull up circuit is coupled between the second terminal of the first photodetector and a second voltage supply node;
a second photodetector, wherein a first terminal of the second photodetector is coupled to the first voltage supply node; and
a second control circuit comprising a second pull down circuit and a second pull up circuit, wherein the second pull down circuit is coupled between a second terminal of the second photodetector and a second reference voltage node, wherein the second reference voltage node is configured to be coupled to a second reference voltage that varies during the shot cycle of the photoemitter, wherein the first reference voltage and the second reference voltage are configured to vary differently during the shot cycle of the photoemitter, wherein the second pull up circuit is coupled between the second terminal of the second photodetector and the second voltage supply node.