We find that electrostatic cross-talk may define the ultimate density limit of SWNT-PCM memory, by making co-programming of neighboring cells difficult. Scaling of the nanogap or structures free of broken tubes promis...
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ISBN:
(纸本)9781479954063
We find that electrostatic cross-talk may define the ultimate density limit of SWNT-PCM memory, by making co-programming of neighboring cells difficult. Scaling of the nanogap or structures free of broken tubes promise denser arrays, but the practical and economic viability of these approaches remain a concern.
Due to the growing demand for large memories, using emerging technologies such as Phase Change Memories (PCM) are inevitable. PCM with appropriate scalability, power consumption and multiple bits per cell storage capa...
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ISBN:
(纸本)9781479936090
Due to the growing demand for large memories, using emerging technologies such as Phase Change Memories (PCM) are inevitable. PCM with appropriate scalability, power consumption and multiple bits per cell storage capability is a probable candidate for substituting DRAM. Although storing multiple bits per cell seems to be a rational response to large memory demands, there is a significant problem to achieve this goal. Resistance drift problem is an important reliability concern that is coupled to a multi-level cell PCM (MLC PCM) memory system. In this paper, we propose a memory system architecture that, by exploiting the benefits of compression, converts resistance drift prone blocks to drift resilient blocks in order to protect the memory system from resistance drift. Evaluations on a full-system simulator, consisting of a quad-core ALPHA CMP and a banked PCM memory, show that our proposed approach provides up to 9.8x reduction in bit error rate, an average of 8% reduction in energy consumption, and 21% IPC improvement.
This work presents a statistical characterization of the set operation in phase change memory (PCM) arrays. The set performance was studied in devices programmed with increasing size of the amorphous region by means o...
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ISBN:
(纸本)9781479980000
This work presents a statistical characterization of the set operation in phase change memory (PCM) arrays. The set performance was studied in devices programmed with increasing size of the amorphous region by means of suitable reset pulses. The thickness-dependent set time and statistics are explained by the different roles of the nucleation and growth of crystalline grains in the amorphous volume. We then analyzed the set transition kinetics comparing 2 set techniques, namely: i) crystallization in the solid state through rectangular pulses below the reset level and ii) crystallization from the liquid phase through triangular pulses above the reset level. The experimental results provide guiding rules for minimizing the energy consumption and the switching variability in PCM arrays.
This paper presents an LTSpice model for a Phase Change Memory (PCM) cell that accurately simulate the temperature profile, the crystalline fraction and the resistance of the cell as a function of the programming puls...
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ISBN:
(纸本)9781479946532
This paper presents an LTSpice model for a Phase Change Memory (PCM) cell that accurately simulate the temperature profile, the crystalline fraction and the resistance of the cell as a function of the programming pulse based on physical theories. The model is able to generate the I-V characteristics of a PCM cell, and precisely simulate the drift phenomenon of resistance and threshold voltage at the amorphous phase. The parameters in the model are calibrated with experimental data, and the exact duration of the programming pulse and OFF time are calculated to accurately assess the impact of time. The simulation results of the proposed PCM model are in close agreement with experimental results.
Digital Communications: Principles and Systems provides a thorough grounding in digital communications using an innovative engineering-first approach to build a nonmathematical overview covering building blocks, signa...
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ISBN:
(数字)9781849196123
ISBN:
(纸本)9781849196116
Digital Communications: Principles and Systems provides a thorough grounding in digital communications using an innovative engineering-first approach to build a nonmathematical overview covering building blocks, signal processing tasks, general features and design considerations. Topics covered include transmission channels, source coding, digital baseband transmission, digital modulation, noise impact in digital transmission, error control coding, advanced signal enhancement techniques for wireless channels and digital transmission link analysis and *** reader is given an insight into the engineering concept and the underlying physical considerations, a clear appreciation of the parameters involved, and an understanding of the interplay of these parameters. The book includes several unpublished original derivations, new insights and alternative approaches that make the understanding of key topics and their application much *** covered include:* overview of digital communication* linear channels and systems* nonlinear systems* sampling of baseband and bandpass signals* quantization and PCM* source coding and lossless data compression* line codes* transmission through bandlimited AWGN channels* transmitted digital signals* noise impact in digital transmission* error control coding* digital transmission link analysis and designMany works on emerging digital transmission techniques are largely confined to academic research papers. This book will give postgraduate students and practicing engineers a sound mastery of the subject.
According to the characteristics of PCM/FM signals, we propose a new method based on STFT resolve tune software. Firstly, the spectral characteristics of PCM/FM signal is given use of the spectrum PCM/FM signal is dem...
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Aimed at the problem that the demodulation threshold of non-coherent demodulation technology of PCM/FM telemetry system using frequency modulation in the present situation of aerospace measurement and control is highe...
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According to the characteristics of PCM/FM signal demodulation, the research based on short-time Fourier transform STFT software resolving method. First detected using STFT f1 and f0 corresponding spectrum energy, acc...
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In order to improve the performance of PCM/FM signal demodulation system, this paper studies a kind of Symbol Detection more (Multi-Symbol Detection, MSD) technology. First for PCM/FM in hardware demodulation, a serie...
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Because the reentry telemetry wireless channel multipath propagation effects and the effect, channel will introduce transmission time delay dispersion, caused between the PCM/FM telemetry signal crosstalk and signal t...
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