Multistage demodulation pixel and method

摘要

A demodulation structure for a n-tap pixel, mainly for 3D time-of-flight (TOF) applications uses a 2-stage switch structure for demodulating a modulated electromagnetic wave. An almost arbitrary number of storage sites per pixel can be implemented enabling an almost arbitrary number of samplings captured during one exposure. It also provides the option to demodulate and integrate different phasing samples according to the different modulation frequencies within the same exposure.

主权项

1. A demodulation pixel, comprising:
a photosensitive area in which photo-charges are generated; a first stage switch for switching the photo-charges from the photosensitive area between a first second stage switch and a second second stage switch; a first set of storage sites for receiving photo-charges from the first second stage switch; and a second set of storage sites for receiving photo-charges from the second second stage switch.