Study on a vision chip based on asynchronous operation

一种基于异步操作的视觉芯片的研究

• 批准号: 11650348
• 负责人: OHTA Jun
• 金额: $ 2.43万
• 依托单位: NARA INSTITUTE OF SCIENCE AND TECHNOLOGY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1999
• 资助国家: 日本
• 起止时间: 1999 至 2000
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-11650348/
• 关键词: vision chips; CMOS image sensor; non-accumulation; modulation light; demodulation; asynchronous mode; フォトゲート; イメージセンサ

In the first year we have studied a vision chip based on non-accumulation mode and its application. First of all we have evaluated photo-transistors, which are essential devices to non-accumulation mode. Next by using the non-accumulation mode we have proposed a vision chip which can take image without being affected by surrounding illumination. This chip can extract only modulated signals from reflected light signals. The simulation results have showed a proper operation. The proposed chip consists of photo-sensing part, a demodulation circuit, an averaging circuit, and a sensitivity correction circuit. To detect a small modulated signals on a strong background illumination, Darlington connected photo-transistors have been employed due to their high gain. To suppress the non-uniform gain we have introduced a sensitivity correction circuit. We have designed the circuits and demonstrated their effectiveness by HSPCIE simulation.In the second year we have studied on high performance of photo-sensing circuit. Floating diffusion has been used to improve the sensitivity and suppress the noise. Standard CMOS fabrication process has been applied to make two types of sensor chip ; photo-gate type and photodiode type. The used process is 0.35μm double poly double metal CMOS.We have preliminary showed the fundamental characteristics of photo-gate type sensor.

第一年我们研究了一种基于非积累模式的视觉芯片及其应用。首先，我们评估了光电晶体管，这是非积累模式的基本器件。接下来，通过使用非累积模式，我们提出了一种视觉芯片，可以在不受周围照明影响的情况下拍摄图像。该芯片只能从反射光信号中提取调制信号。仿真结果表明，该方法操作正确.该芯片由光传感部分、解调电路、平均电路和灵敏度校正电路组成。为了检测强背景照明上的小调制信号，由于其高增益，已经采用了达林顿连接的光电晶体管。为了抑制非均匀增益，我们引入了灵敏度校正电路。我们设计了电路并通过HSPCIE仿真验证了其有效性。第二年我们研究了高性能的光传感电路。采用浮置扩散技术提高了灵敏度，抑制了噪声。标准CMOS制造工艺已被应用于制造两种类型的传感器芯片：光电门型和光电二极管型。采用0.35μm双多晶硅双金属CMOS工艺，初步展示了光电门型传感器的基本特性。

项目成果

太田淳: "光コンピューティング研究のためのマルチプロジェクト方式LSI試作サービス"第91回光コンピューティング研究会講演予稿集. AP002223. 5-10 (2000)

Jun Ota：“用于光学计算研究的多项目型 LSI 原型服务”第 91 届光学计算研究会议论文集 AP002223（2000 年）。

Jun Akasawa, Naoyuki Tokida, Takashi Tokuda, Jun Ohta, and Masahiro Nunoshita: "Proposal of non-accumulation mode vision chip employed sensitivity correction circuits"Spring meeting of Japanese Applied Physics Society. 29p-S-15. 1023 (2000)

Jun Akasawa、Naoyuki Tokida、Takashi Tokuda、Jun Ohta 和 Masahiro Nunoshita：“采用灵敏度校正电路的非累积模式视觉芯片的提案”日本应用物理学会春季会议。