Image sensor and imaging system with shared low conversion gain capacitor

Abstract

An image sensor comprising a pixel cell array is described. The pixel cell array includes a plurality of pixel cells arranged in rows and columns. Individual pixel cells included in the plurality of pixel cells each includes one or more photodiodes configured to photogenerate image charge in response to incident light, a first floating diffusion, a second floating diffusion, a third floating diffusion, a dual floating diffusion transistor coupled between the first floating diffusion and the second floating diffusion, a lateral overflow transistor coupled between the first floating diffusion and the third floating diffusion, and a shared low conversion gain capacitor. The dual floating diffusion transistor and the lateral overflow transistor are coupled in parallel to the first floating diffusion. The second floating diffusion is coupled between the shared low conversion gain capacitor and the first floating diffusion.

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