A High Dynamic Range CMOS Image Sensor With Dual-Exposure Charge Subtraction Scheme

作者：Qian Xinyuan^*; Yu Hang; Chen Shoushun; Low Kay Soon

来源：IEEE Sensors Journal, 2015, 15(2): 661-662.

DOI：10.1109/JSEN.2014.2365173

• CMOS image sensor
• capacitive transimpedance amplifier (CTIA)
• high dynamic range (HDR)
• star tracker

In this paper, we present a CMOS image sensor for star centroid measurement for the application of star trackers. We propose a new capacitive transimpedance amplifier pixel architecture with in-pixel charge subtraction scheme. The pixel is able to achieve high signal-to-noise ratio for dim stars and, at the same time, to avoid saturation for bright stars. A prototype sensor was fabricated using Global Foundry 65-nm mixed-signal CMOS process. Experimental results show that the sensor can achieve 3.8 V/lux.s and 12 dB extension of dynamic range. For the saturated star in conventional method, the centroiding accuracy is improved by over 0.1 pixels after performing charge subtraction.

• 出版日期2015-2