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Publication
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The invention relates to a photoplethysmography (PPG) sensing device comprising - a pulsed light source, - at least one pixel to create photo-generated electrons, synchronized with said pulsed light source. It is mainly characterized in that each pixel comprises: - a pinned photodiode (PPD) having two electronic connection nodes, - a sense node (SN), to convert the photo-generated electrons into a voltage, and - a Transfer Gate (TGtransfer) transistor, having its source electronically connected to one electronic connection node of said pinned photodiode (PPD), and being configured to act as a transfer gate (TG) between said pinned photodiode (PPD) and said sense node (SN), allowing the photo-generated electrons to sink when the light is pulsed-off, the photo-generated electrons integration when the light is pulsed-on and the transfer of at least part of the integrated photo-generated electrons to said sense node for a read-out.
Jan Wienold, Stephen William Wasilewski
Edoardo Charbon, Claudio Bruschini, Ivan Michel Antolovic