An image sensor includes a logic die, including column readout circuits and bitlines connected to the column readout circuits. A sensor die is overlaid on the logic die. The image sensor includes an array of detector elements, each including a sensing circuit on the sensor die, which includes a photodiode, a floating diffusion node connected to one of the terminals of the photodiode, a reset transistor coupled to the floating diffusion node, and a source follower transistor. In each detector ...
