A 12-bit single slope ADC with multi-step structure and ramp calibration technique for image sensors. - Hao Li; Dongsheng Liu; Yingxiang Liang; Ang Hu; Zheng Nie; Chengcheng Zhang; Kaiyue Li; Guangda Niu; Liang Gao; Jiang Tang (Microelectron. J., 2023)