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为了减轻辐射环境中静态随机存储器(SRAM)受单粒子翻转(SEU)的影响以及解决低功耗和稳定性的问题,采用TSMC 90nm工艺,设计了一款可应用于辐射环境中的超低功耗容错静态随机存储器。该SRAM基于双互锁存储单元(DICE)结构,以同步逻辑实现并具有1KB(1K×8b)的容量,每根位线上有128个标准存储单元,同时具有抗SEU特性,提高并保持了SRAM在亚阈值状态下的低功耗以及工作的稳定性。介绍了这种SRAM存储单元的电路设计及其功能仿真,当电源电压VDD为0.3V时,该SRAM工作频率最大可达到2.7MHz,此时功耗仅为0.35μW;而当VDD为1V时,最大工作频率为58.2MHz,功耗为83.22μW。 相似文献
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提出了一种具有软错误自恢复能力的12管SRAM单元。该单元省去了专用的存取管,具有高鲁棒性、低功耗的优点。在65 nm CMOS工艺下,该结构能够完全容忍单点翻转,容忍双点翻转的比例是64.29%,与DICE加固单元相比,双点翻转率降低了30.96%。与DICE、Quatro等相关SRAM加固单元相比,该SRAM单元的读操作电流平均下降了77.91%,动态功耗平均下降了60.21%,静态电流平均下降了44.60%,亚阈值泄漏电流平均下降了27.49%,适用于低功耗场合。 相似文献
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为了提高航空航天设备的可靠性和运行速度,提出了一种新型读写分离的14T静态随机存储器(SRAM)单元。基于65 nm体硅CMOS工艺,对读写分离14T存储单元的性能进行仿真,并通过在关键节点注入相应的电流源模拟高能粒子轰击,分析了该单元抗单粒子翻转(Single Event Upset,SEU)的能力。与传统6T相比,该单元写速度、读静态噪声容限和位线写裕度分别提升了约5.1%、20.7%和36.1%。写速度优于其他存储单元,读噪声容限优于6T单元和双联锁存储单元(DICE),在具有较好的抗SEU能力的同时,提高了读写速度和读静态噪声容限。 相似文献
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文章首先分析了静态随机存储器(SRAM)6T存储单元结构的基本工作原理,总结了6T存储单元的优缺点并介绍了存储单元的重要参数静态噪声容限(SNM)。在此基础上给出了一种基于实际深亚微米CMOS工艺的存储单元的设计方法,该方法的优势在于首先考虑单个读、写操作的限制,然后将多个限制因素综合在一起考虑,并通过三维曲线图形为仿真提供指导,以提高设计效率,缩短设计周期。最后给出了存储单元的晶体管参数并采用Hspice进行验证,仿真结果表明,采用这种方法设计出来的单元是稳定可靠的。 相似文献
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提出了两种新的电路技术,在降低多输入多米诺"或门"的动态功耗的同时减小了漏电流,并提高了电路的噪声容限.采用新的电路技术设计了八输入多米诺"或门"并基于45nm BSIM4 SPICE 模型对其进行了模拟.模拟结果表明,设计的两种新多米诺电路在同样的噪声容限下有效地降低了动态功耗,减小了总的漏电流,同时提高了工作速度.与双阈值多米诺电路相比,设计的两种电路动态功耗分别降低了8.8%和11.8%,电路速度分别提高了9.5%和13.7%,同时总的漏电流分别降低了80.8%和82.4%.基于模拟结果,也分析了双阈值多米诺电路中求值点的不同逻辑状态对总的漏电流的影响. 相似文献
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为减小共源线噪声对NAND闪存读可靠性的影响,设计了一种可实现C/F(Coarse/Fine)读取操作的页缓存器电路,并设计实现了适用于此电路的C/F读取算法,显著减小了共源线噪声.该算法通过两次子读感应读取存储单元,在第一次子读感应中分辨出阈值电压较低的存储单元并标记在页缓存器中,使其不再进行第二次子读感应,从而减小共源线噪声引起的阈值偏移.电路仿真计算表明,该支持C/F读取算法的页缓存器结构能够减小阈值偏移至少495.6mV,有效提高了NAND闪存读操作的精确性. 相似文献
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提出了两种新的电路技术,在降低多输入多米诺"或门"的动态功耗的同时减小了漏电流,并提高了电路的噪声容限.采用新的电路技术设计了八输入多米诺"或门"并基于45nm BSIM4 SPICE 模型对其进行了模拟.模拟结果表明,设计的两种新多米诺电路在同样的噪声容限下有效地降低了动态功耗,减小了总的漏电流,同时提高了工作速度.与双阈值多米诺电路相比,设计的两种电路动态功耗分别降低了8.8%和11.8%,电路速度分别提高了9.5%和13.7%,同时总的漏电流分别降低了80.8%和82.4%.基于模拟结果,也分析了双阈值多米诺电路中求值点的不同逻辑状态对总的漏电流的影响. 相似文献
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Michael Reilly 《半导体技术》2004,29(12)
DUV lithography, using the 248 nm wavelength, is a viable manufacturing option for devices with features at 130 nm and less. Given the low kl value of the lithography, integrated process development is a necessary method for achieving acceptable process latitude. The application of assist features for rule based OPC requires the simultaneous optimization of the mask, illumination optics and the resist.Described in this paper are the details involved in optimizing each of these aspects for line and space imaging.A reference pitch is first chosen to determine how the optics will be set. The ideal sigma setting is determined by a simple geometrically derived expression. The inner and outer machine settings are determined, in turn,with the simulation of a figure of merit. The maximum value of the response surface of this FOM occurs at the optimal sigma settings. Experimental confirmation of this is shown in the paper.Assist features are used to modify the aerial image of the more isolated images on the mask. The effect that the diffraction of the scattering bars (SBs) has on the image intensity distribution is explained. Rules for determining the size and placement of SBs are also given.Resist is optimized for use with off-axis illumination and assist features. A general explanation of the material' s effect is discussed along with the affect on the through-pitch bias. The paper culminates with the showing of the lithographic results from the fully optimized system. 相似文献
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Thomas M.Trexler 《半导体技术》2004,29(5)
From its emergence in the late 1980s as a lower cost alternative to early EEPROM technologies, flash memory has evolved to higher densities and speedsand rapidly growing acceptance in mobile applications.In the process, flash memory devices have placed increased test requirements on manufacturers. Today, as flash device test grows in importance in China, manufacturers face growing pressure for reduced cost-oftest, increased throughput and greater return on investment for test equipment. At the same time, the move to integrated flash packages for contactless smart card applications adds a significant further challenge to manufacturers seeking rapid, low-cost test. 相似文献
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The relation between the power of the Brillouin signal and the strain is one of the bases of the distributed fiber sensors of temperature and strain. The coefficient of the Bfillouin gain can be changed by the temperature and the strain that will affect the power of the Brillouin scattering. The relation between the change of the Brillouin gain coefficient and the strain is thought to be linear by many researchers. However, it is not always linear based on the theoretical analysis and numerical simulation. Therefore, errors will be caused if the relation between the change of the Brillouin gain coefficient and the strain is regarded as to be linear approximately for measuring the temperature and the strain. For this reason, the influence of the parameters on the Brillouin gain coefficient is proposed through theoretical analysis and numerical simulation. 相似文献
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The parallel thinning algorithm with two subiterations is improved in this paper. By analyzing the notions of connected components and passes, a conclusion is drawn that the number of passes and the number of eight-connected components are equal. Then the expression of the number of eight-connected components is obtained which replaces the old one in the algorithm. And a reserving condition is proposed by experiments, which alleviates the excess deletion where a diagonal line and a beeline intersect. The experimental results demonstrate that the thinned curve is almost located in the middle of the original curve connectivelv with single pixel width and the processing speed is high. 相似文献
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Today, micro-system technology and the development of new MEMS (Micro-Electro-Mechanical Systems) are emerging rapidly. In order for this development to become a success in the long run, measurement systems have to ensure product quality. Most often, MEMS have to be tested by means of functionality or destructive tests. One reason for this is that there are no suitable systems or sensing probes available which can be used for the measurement of quasi inaccessible features like small holes or cavities. We present a measurement system that could be used for these kinds of measurements. The system combines a fiber optical, miniaturized sensing probe with low-coherence interferometry, so that absolute distance measurements with nanometer accuracy are possible. 相似文献
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Qi-jiang Ran Pei-de Han Yu-jun Quan Li-peng Gao Fan-ping Zeng Chun-hua Zhao 《光电子快报》2008,4(4):239-242
This paper presents a new method to increase the waveguide coupling efficiency in hybrid silicon lasers. We find that the propagation constant of the InGaAsP emitting layer can be equal to that of the Si resonant layer through improving the design size of the InP waveguide. The coupling power achieves 42% of the total power in the hybrid lasers when the thickness of the bonding layer is 100 nm. Our result is very close to 50% of the total power reported by Intel when the thickness of the thin bonding layer is less than 5 nm. Therefore, our invariable coupling power technique is simpler than Intel's. 相似文献
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It is well known that adding more antennas at the transmitter or at the receiver may offer larger channel capacity in the multiple-input multiple-output(MIMO) communication systems. In this letter, a simple proof is presented for the fact that the channel capacity increases with an increase in the number of receiving antennas. The proof is based on the famous capacity formula of Foschini and Gans with matrix theory. 相似文献
18.
Teleportation of an arbitrary unknown N-qubit entangled state under the controlling of M controllers
A new quantum protocol to teleport an arbitrary unknown N-qubit entangled state from a sender to a fixed receiver under M controllers(M < N) is proposed. The quantum resources required are M non-maximally entangled Greenberger-Home-Zeilinger (GHZ) state and N-M non-maximally entangled Einstein-Podolsky-Rosen (EPR) pairs. The sender performs N generalized Bell-state measurements on the 2N particles. Controllers take M single-particle measurement along x-axis, and the receiver needs to introduce one auxiliary two-level particle to extract quantum information probabilistically with the fidelity unit if controllers cooperate with it. 相似文献
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A continuous-wave (CW) 457 nm blue laser operating at the power of 4.2 W is demonstrated by using a fiber coupled laser diode module pumped Nd: YVO4 and using LBO as the intra-cavity SHG crystal With the optimization of laser cavity and crystal parameters, the laser operates at a very high efficiency. When the pumping power is about 31 W, the output at 457nm reaches 4.2 W, and the optical to optical conversion efficiency is about 13.5% accordingly. The stability of the out putpower is better than 1.2% for 8 h continuously working. 相似文献
20.
《中国通信》2014,(7)
正Wireless Body-area Networks The last decade has witnessed the convergence of three giant worlds:electronics,computer science and telecommunications.The next decade should follow this convergence in most of our activities with the generalization of sensor networks.In particular with the progress in medicine,people live longer and the aging of population will push the development of wireless personal networks 相似文献