**This is an old revision of the document!** CMOS manufacturing This page focuses on the process of the tacked Back-Illuminated CMOS Image Sensor (BI-CIS). Figure 1: Strcuture of a 3 layers pixel/DRAM/CIS 1) 1) A Review of the Recent Developments in the Fabrication Processes of CMOS Image Sensors for Smartphones, Kirthika Nahalingam, Linda P. B. Katehi, 2023