[18p-Z22-1~15] 12.7 Biomedical Engineering and Biochips

▼ [18p-Z22-13] A self-reset CMOS imaging device with high capacitance photodiode

〇(D)Thanet Pakpuwadon¹, Kiyotaka Sasagawa¹, Mark Christian Guinto¹, Makito Haruta¹, Hironari Takehara¹, Hiroyuki Tashiro^1,2, Jun Ohta¹ (1.Nara Inst. of Sci. and Tech., 2.Kyushu Univ.)

Keywords:Image sensor, Intrinsic signal, Somatosensory cortex

Be able to observe or monitoring an intrinsic signal in the mouse brain is an important step in understanding the brain function. Acquiring those signals require high signal-to-noise ratio (SNR). We developed a self-reset image sensor with high effective SNR. The self-resetting system was designed using Schmitt trigger inverter to prevent the pixel from its saturation even at a high light intensity, which cause this imager succeeded in getting such high SNR. This time, the pixel was designed with P+/N-well/P-sub as a photodiodes structure for higher capacitance for reducing the number of self-resetting. Therefore, this image sensor has an extremely high SNR and also high stability.