Switchable conversion gain image sensor with improved uniformity and methods thereof

A switchable conversion gain (SCG) image sensor, comprising:

• a pixel cell array including a plurality of pixel cells arranged in rows and columns, wherein individual pixel cells included in the plurality of pixel cells each include:
• one or more photodiodes configured to generate image charge in response to incident light;
• a plurality of conversion gain capacitors, including a high conversion gain capacitor with a first capacitance and a low conversion gain capacitor with a second capacitance, wherein the second capacitance is greater than the first capacitance;
• and
• a switch transistor coupled between the high conversion gain capacitor and the low conversion gain capacitor, wherein the high conversion gain capacitor and the low conversion gain capacitor are selectively coupled to receive the image charge from the one or more photodiodes,
• wherein the pixel cell array is segmented into a plurality of zones, and wherein the low conversion gain capacitor for the individual pixel cells physically vary on a zone-by-zone basis.