Patent ID: 11864877
Assignee: ECOLE POLYTECHNIQUE FEDERALE DE LAUSANNE (EPFL)
Field: Audio-visual technology (Electrical engineering)
Classification: CPC A  H | IPC A  H

Claim 5:
6. A photoplethysmography (PPG) sensing device, the device comprising:
a pulsed light source,
at least one pixel for light-to-charge conversion to create photo-generated electrons, comprising:
a pinned photodiode including a well,
a sense node, and
a transfer gate having its source electronically connected to one electronic connection node of the pinned photodiode, and being configured to act as a transfer gate between the pinned photodiode and the sense node to transfer at least part of any integrated photo-generated electrons to the sense node for a read-out;
wherein each pixel further comprises a sink gate electronically connected to said pinned photodiode, and being configured to allow photo-generated electrons to sink towards a constant DC power source or a capacitance when the light source is pulsed-off and the photo-generated electrons integration when the light source is pulsed-on.