マルチサンプリングと無線インターコネクトを用いた浮動小数点型ワイドレンジCMOSイメージセンサ(ディジタル・情報家電,放送用,ゲーム機用システムLSI,回路技術(一般,超高速・低電力・高機能を目指した新アーキテクチャ))

概要

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In this report, we propose a floating point CMOS image sensor with the Dynamic Range 108dB, using multiple sampling and wireless interconnection. This feature is achieved by combining two techniques. To enhance the dynamic range, measurements of photo current integration time with binary weighted multi-rate sampling pulses which perform time-to-digital conversion, and analog-to-digital conversion of analog voltage sampled at the last sampling with a reference ramp voltage by using a comparator sheared with four pixels. The digital data are directly converted to the floating-point format The image sensor is composed of a stacked structure of two-chips for analog pixels and memory. To achieve mega pixel capability, pixel blocks integrated on the analog-chip communicate to memory-chip with capacitor based parallel wireless interconnection. A 32×32 pixel array test chip has been designed with a 0.18um CMOS technology and the pixel size is 18×18um^2 and a fill factor of about 40%.
2006-12-07