高精度光电编码器ASIC芯片信号读出电路设计  

Signal Readout Circuit Design for A High-Precision Optical Encoder ASIC Chip

作　　者：王风唯 常玉春[2] 赵东旭[1] WANG Fengwei;CHANG Yuchun;ZHAO Dongxu(State Key Laboratory of Luminescence and Applications,Changchun Institute of Optics,Fine Mechanics and Physics,Chinese Academy of Sciences,Changchun 130021,CHN;College of Electronic Science and Engineering,Jilin University,Changchun 130012,CHN;University of Chinese Academy of Sciences,Beijing 100049,CHN)

机构地区：[1]中国科学院长春光学精密机械与物理研究所发光学及应用国家重点实验室,长春130021 [2]吉林大学电子科学与工程学院,长春130012 [3]中国科学院大学,北京100049

出　　处：《半导体光电》2024年第5期713-719,共7页Semiconductor Optoelectronics

基　　金：国家重点研发计划项目(2022YFE0202300);吉林省与中国科学院科技合作高技术产业化专项资金项目(2022SYHZ0001);吉林省发展改革委资助项目(2019C035-3).

摘　　要：为满足光电编码器信号读出电路在集成度、体积和分辨率等方面的设计要求,文章基于伪随机编码原理和莫尔条纹光信号理论,对增量式光电编码器和绝对式光电编码器的编码原理进行研究。设计并流片了一款基于增量式与伪随机混合编码方式的高分辨率光电编码器专用集成芯片,基于350 nm CMOS工艺实现了光电探测器与读出电路的全集成。该芯片尺寸仅有4.6 mm×3.5 mm,分辨率可以达到22 bit,在50 kHz的信号周期下能同时产生精确的正弦和余弦输出信号,以及在2 MHz的时钟频率下输出数字形式的伪随机码信号,满足系统的设计指标。To meet the design requirements of integration,volume,and resolution for the signal readout circuit of optical encoders,this study analyzes the encoding principles of incremental and absolute optical encoders,based on the pseudo-random coding principle and Moiréfringe optical signal theory.A dedicated integrated circuit for high-resolution optical encoders,based on the incremental and pseudo-random mixed encoding scheme,is designed and fabricated.Utilizing a 350 nm CMOS process,full integration of the photodetector and readout circuitry is achieved.The chip size is only 4.6 mm×3.5 mm,with a resolution of up to 22 bit.It can simultaneously generate precise sine and cosine output signals within a signal period of 50 kHz,as well as output digital pseudo-random code signals at a clock frequency of 2 MHz,meeting the design specifications of the system.

关 键 词：光电编码器 光电集成芯片 M序列 莫尔条纹原理 光电探测器 

分 类 号：TN911.8[电子电信—通信与信息系统]