A low-voltage PWM CMOS imager with small pixel size using an in-pixel gate-common comparator

IEICE Electronics Express

Keiichiro Kagawa¹  Tatsuya Sasaki¹  Sanshiro Shishido¹  Masahiro Nunoshita¹  Itsuki Nagahata¹  Jun Ohta¹ 

[1] Graduate School of Materials Science, Nara Institute of Science and Technology

关键词: CMOS imager;    pulse width modulation;    low voltage;   

DOI  :  10.1587/elex.4.271

学科分类：电子、光学、磁材料

来源: Denshi Jouhou Tsuushin Gakkai

【 摘 要 】

References(9)Cited-By(3)We propose a new pixel structure of pulse-width-modulation (PWM) CMOS active pixel sensor with a small pixel size performing a pixel-level single-slope A/D conversion to realize a low and single power supply operation. The pixel is composed of only three transistors without pixel-circuit sharing, and has a gate-common amplifier that compares a photodiode voltage on the gate node with a ramp signal on the source for A/D conversion. We have fabricated a 128×96-pixel prototype imager with an on-chip ramp generator and bootstrap circuits in a 0.35-µm CMOS technology, and successfully demonstrated image acquisition with a 1.4-1.8-V single power supply.

【 授权许可】

Unknown