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陈雨过, 王观涛, 黄文韬, 卓成, 尹勋钊. 铁电晶体管近似搜索存储器的电流模测量实现[J]. 计算机辅助设计与图形学学报.
引用本文: 陈雨过, 王观涛, 黄文韬, 卓成, 尹勋钊. 铁电晶体管近似搜索存储器的电流模测量实现[J]. 计算机辅助设计与图形学学报.
Current-based Design of Ferroelectric Approximate Search Memory[J]. Journal of Computer-Aided Design & Computer Graphics.
Citation: Current-based Design of Ferroelectric Approximate Search Memory[J]. Journal of Computer-Aided Design & Computer Graphics.

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

  • 摘要: 在高硬件容错性模型中, 近似搜索可以应对数据量与运算量需求能效提高. 针对三态内容寻址存储器在近似搜索模式下精度低, 可扩展性差问题, 提出了一种电流模测量方案. 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以提高了电路可扩展性; 并引入将模拟电流信号转化为数字脉冲信号的感测放大器(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, 验证提出的方案成功实现了高能效三态内容寻址存储器近似搜索.

     

    Abstract: 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 transistor aiming to achieve low power and area; the architecture of the proposed memory cell replaces the voltage-based output signal with the current-based one, which efficiently increase 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 result indicate that the high energy efficiency approximate search was successfully achieved.

     

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