小型光电编码器细分芯片的设计  

Design of interpolation chip for small photoelectric encoders

作　　者：丁宁[1,2] 李海彬[1,2] 彭乐立 余芝帅 常玉春[1,2] 

机构地区：[1]吉林大学集成光电子国家重点实验室,长春130012 [2]吉林大学电子科学与工程学院,长春130012

出　　处：《吉林大学学报（工学版）》2016年第2期602-608,共7页Journal of Jilin University:Engineering and Technology Edition

基　　金：国家自然科学基金项目(61274023);教育部新世纪优秀人才支持计划项目(NCET-12-0236);吉林大学研究生创新研究计划项目(2015066)

摘　　要：为了实现在不增编码器体积和码盘刻线数的前提下提高中低精度小型光电编码器分辨力,设计了一种适用于小型光电编码器的细分芯片。首先,分析目前电子学细分方法的优缺点,折中分辨率、精度、电路复杂性和可集成性等因素,在相位调制理论基础上提出了把对空间相位位移的测量转化为对瞬时周期时间差值的测量的细分算法,并结合算法原理进行芯片架构总体设计。其次,利用Cadence软件设计了信号细分处理芯片的各个模块电路。然后,对芯片总体电路进行仿真得到调制信号瞬时周期值。最后,将细分后的测量角位移结果与理论基准值对比,并计算最终细分精度。实验结果表明：当光电编码器信号输入在1-100kHz频率范围内,该细分芯片可以实现对光电信号的0-100倍细分。在输入100kHz时细分精度达到0.4571′。与同类处理电路相比具有集成度高、细分辨向功能统一、可移植性好等特点,有一定的工程应用价值。In order to improve the resolution of low precision small photoelectric encoder without increasing the encoder size and the scribed line number,an interpolation chip is designed that is suitable to small photoelectric encoder.First,the advantages and disadvantages of current electronic interpolation methods are analyzed,considering the resolution,precision,the circuit complexity and integration,and other factors.Based on the theory of phase modulation,an interpolation algorithm is proposed,which converts the measurement of spatial phase displacement to that of time difference value of instantaneous cycle.Then,the overall architecture of the whole chip is designed according to the algorithm principle,and each module of the chip is designed using Cadence software.The instantaneous cycle value of the modulation signal is obtained by simulation of the overall chip circuit.Finally,the measured spatial angular displacement after subdivision is compared with the theoretical value,and the subdivision precision is calculated.Experiment results show that,when the frequency of the photoelectric encoder signal input is in the range from 1kHz to 100 kHz,thechip can realize optical signal segment of 0to 100 times.When the input is at 100 kHz,the precision of 0.4571＇can be achieved.Compared with other similar processing circuit,the designed chip has the advantages of high integration level,combining the distinguishing function and subdivision,good portability,and has certain engineering application value.

关 键 词：光电编码器 细分芯片 空间位移测量 分辨率 精度 

分 类 号：TP212.1[自动化与计算机技术—检测技术与自动化装置]