铁电晶体管近似搜索存储器的电流模测量实现  

Current-Based Design of Ferroelectric Approximate Search Memory

作　　者：陈雨过 王观涛 黄文韬 卓成[1] 尹勋钊 Chen Yuguo;Wang Guantao;Huang Wentao;Zhuo Cheng;Yin Xunzhao(College of Information Science and Electronic Engineering,Zhejiang University,Hangzhou 310027;Zhejiang Lab,Hangzhou 310027;Key Laboratory of Dependable Service Computing in Cyber Physical Society,Ministry of Education of China,Chongqing University,Chongqing 400044)

机构地区：[1]浙江大学信息与电子工程学院,杭州310027 [2]之江实验室,杭州310027 [3]重庆大学信息物理社会可信服务计算教育部重点实验室,重庆400044

出　　处：《计算机辅助设计与图形学学报》2023年第5期796-802,共7页Journal of Computer-Aided Design & Computer Graphics

基　　金：信息物理社会可信服务计算教育部重点实验室基金(CPSDSC202002);国家自然科学基金(62104213,92164203);浙江省自然科学基金(LQ21F040006,LD21F040003);浙江省科技计划(2022C01232);之江实验室基金(2021MD0AB02);浙江大学曹光彪高科技发展基金。

摘　　要：在高硬件容错性模型中,近似搜索可应对数据量与运算量需求能效提高的问题.针对三态内容寻址存储器在近似搜索模式下精度低、可扩展性差等问题,提出了一种电流模测量方案.该方案基于铁电晶体管优化了存储单元的结构设计以降低面积与功耗;将阵列搜索不匹配度由原先的电压输出改为电流输出,提高了电路可扩展性;引入了将模拟电流信号转化为数字脉冲信号的感测放大器(sense amplifier,SA)作为外围电路以检测存储阵列的不匹配度输出.通过Hspice与Virtuoso仿真平台搭建瞬态仿真电路实验,验证了该方案成功地实现了高能效三态内容寻址存储器近似搜索.In the models with excellent fault-tolerance to hardware,approximate search can deal with the higher efficiency requirement of the amount of data and processing.A current based measurement scheme is proposed in this paper for the existing ternary content addressable memories in approximate search mode array suffered poor accuracy and scalability.The memory architecture is improved by ferroelectric field effect tran-sistor aiming to achieve low power and area;the architecture of the proposed memory cell replaces the volt-age-based output signal with the current-based one,which efficiently increases the scalability of the array;a sense amplifier which converts the analog signal to digital spike signal is introduced as the peripheral circuitry to measure the output of the mismatch numbers of the TCAM array.Through the transient simulation circuit in Hspice and Virtuoso software simulation platform,the results indicate that the high energy efficiency approxi-mate search is successfully achieved.

关 键 词：存内计算 三态内容寻址存储器 铁电场效应晶体管 近似搜索 

分 类 号：TN432[电子电信—微电子学与固体电子学]