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An On-Chip Binary-Weight Convolution CMOS Image Sensor for Neural Networks

为神经网络的一个在薄片上二进制重量的卷绕旋转互补金属氧化物半导体图象传感器

作     者:Kim, Woo-Tae Lee, Hyunkeun Kim, Jung-Gyun Lee, Byung-Geun 

作者机构:Gwangju Inst Sci & Technol Sch Elect Engn & Comp Sci Gwangju 61005 South Korea 

出 版 物:《IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS》 (IEEE工业电子学汇刊)

年 卷 期:2021年第68卷第8期

页      面:7567-7576页

核心收录:

学科分类:0808[工学-电气工程] 08[工学] 0804[工学-仪器科学与技术] 0811[工学-控制科学与工程] 

基  金:MOTIE MSIT (Ministry of Science and ICT), Korea, under the ITRC (Information Technology Research Center) support program [IITP-2020-2018-0-01433] 

主  题:Kernel Convolution Quantization (signal) Modulation Neural networks Field programmable gate arrays Application specific integrated circuits Binary weight neural network CMOS image sensor convolution operation incremental delta-sigma analog-to-digital converter 

摘      要:A CMOS image sensor (CIS) that can perform on-chip binary convolution is presented. The CIS can greatly reduce memory usage and computational complexity by directly generating a feature map for a binary neural network. The pixel readout of the CIS is performed in the column-parallel fashion using incremental delta-sigma analog-to-digital converters (ADCs). The CIS operates in two different modes: convolution and normal modes. When the column ADC is working in the convolution mode, it works as a first-order delta-sigma ADC and generates convolved images using a binary kernel. In the normal operation mode, the ADC is switched to a second-order delta-sigma ADC with little hardware modification and used to capture high-quality images. To demonstrate the CIS architecture, a 192 x 128-pixel CIS, which occupies an active die area of 14.44 mm(2), is fabricated in a 0.18 mu m standard CMOS process. The performance of the CIS is evaluated through measurements and network simulations. In the normal operation mode, the CIS achieves a read noise of 14.79 e(rms)(-) and a full-well capacity of 6,420 e(-) with a resulting dynamic range of 53 dB. The power consumptions of the CIS are 49.2 and 52.5 mW during the normal and convolution modes, respectively.

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