共查询到15条相似文献,搜索用时 62 毫秒
1.
2.
由于二极管在单元尺寸上的优势,被认为是高密度相变存储器中驱动管的不二之选.如果制备二极管的工艺参数不恰当,则大的漏电流会影响PCRAM存储数据的准确性和长久的保持力.首先简要介绍了具有自主知识产权的相变存储器中驱动二极管阵列的制备方法,然后从载流子分布以及半导体器件角度,分析了驱动二极管之间串扰电流的产生原因,最后,依据工艺流程介绍了一种简单的方法来减小驱动二极管之间的串扰电流.依据SMIC的工艺进行TCAD仿真,结果表明此种方法能够在增大驱动电流的同时大大减小串扰电流. 相似文献
3.
4.
5.
6.
7.
8.
9.
10.
基于中芯国际40 nm工艺制备的64 Mbit相变存储器,设计并进行了两组对比实验.分别使用不同幅值和脉宽的RESET电流脉冲对存储器单元进行疲劳操作,对相变存储器单元的疲劳性能与RESET操作电流的关系进行了研究.实验结果表明,存储单元的疲劳寿命和RESET脉冲幅值的平方呈反比关系,和脉冲宽度呈反比关系.在相变存储器的操作过程中,高阻态下的电阻值出现先减小后增大的漂移现象,这是因为操作电流会对相变材料组分产生影响,在相变材料层中会出现逐渐增大的孔洞,孔洞最终导致相变器件失效,与实验中高阻态阻值漂移现象相吻合,同时可以用来预测存储单元的疲劳寿命. 相似文献
11.
As DRAM technology is facing scalability limitations due to its excessive leakage power in nano-scale technologies, various non-volatile memory technologies have been emerged to replace it in memory hierarchy. Among these technologies, Phase Change Memory (PCM) is a promising technology for main memory due to its near-zero leakage power, higher density, non-volatility and soft error immunity. However, its major drawbacks, including high write energy and limited write endurance, have prevented its usage as a drop-in replacement of DRAM technology. In this paper, we propose a technique to swap data between memory lines with goal of reducing bit flips. The proposed swapping technique finds the best place to write a chunk of data among a limited set of lines to minimize number of bit flips. The proposed swapping operation works online i.e, does not require any data profiling. Moreover, it does not require major modifications of existing solutions and works only by the addition of a proposed circuitry. It is remarkable that, this technique is additive to various other architectures aiming at PCM lifetime enhancement. Experimental results carried out on a quad core CMP system show that the proposed technique prolongs PCM main memory lifetime by 48% which is achieved at the price of 1% and 2% overhead in read and write latencies respectively. 相似文献
12.
Simone Raoux Robert M. Shelby Becky Munoz Yi-Chou Chen Erh-Kun Lai 《Microelectronic Engineering》2008,85(12):2330-2333
Phase change materials can exist in two different phases, the amorphous and the crystalline phase, which exhibit distinctly different physical properties. It is possible to repeatedly switch the state of these materials, from the amorphous phase to the crystalline phase by heating the material above its crystallization temperature, and from the crystalline to the amorphous phase by melt-quenching. Phase change materials have been utilized very successfully in all modern optical re-writable storage media such as CDs, DVDs and Blu-ray disks. Recently, they have also been applied to solid-state memory devices where their large difference in electrical resistivity is used to store information. This paper reviews the unique properties of phase change materials in particular as they are important for their application to these devices. 相似文献
13.
14.