Canon Files for Dual-Scale Column-Parallel ADC Patent

Canon's patent application US20130206961 "Solid-State Image Sensing Device" by Ikeda Yasuji, Hashimoto Seiji, Muto Takashi, Matsuno Yasushi, and Yoshida Daisuke describes a dual gain column-parallel ramp ADC (Reference Signal 1 & 2 are the two different scale ramps):

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