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

Claim 13:
14. The method according to claim 11, comprising:
pulsing-off the light source, and
integrating charge in the pinned photodiode during a predetermined period of time;
transferring the charge to the sense node and storing the charge in a first capacitor so as to generate a voltage corresponding to ambient light;
pulsing-on the light source for at least said predetermined period of time, integrating charge in the pinned photodiode during said predetermined period of time;
transferring the charge to the sense node and storing the charge in a second capacitor so as to generate a voltage corresponding to ambient light mixed with the pulsed light source; and
subtracting the voltage corresponding to the ambient light from the voltage corresponding to the pulsing-on of the pulsed light source mixed with the ambient light to result in a voltage corresponding the detected light originating from the pulsed light source exclusively.