有机非挥发存储器件:浮栅结构有机薄膜晶体管

提出了一种浮栅结构的新型有机薄膜晶体管(FG-OTFT)器件,并阐述了这种器件的工作机理.该器件通过控制浮 置栅上的电荷来控制 FG-OTFT 器件的阈值电压的大小,而器件不同的阈值电压便可用来存储“0”和“1”两个状态,故这种器 件可以被用作有机非挥发存储器.我们通过计算机数值模拟的方法对这种器件进行了研究.研究表明...     

共振隧穿器件应用电路概述——共振隧穿器件讲座(2)

在“共振隧穿器件概述”的基础上,对共振隧穿器件应用电路作了全面概括的介绍。首先对共振隧穿器件应用电路的特点、分类和发展趋势作了简述;进一步对由RTDH/EMT构成的单-双稳转换逻辑单元(MOBILE)和以它为基础构成的RTD应用电路,包括柔性逻辑、静态随机存储(SRAM)、神经元、静态分频器等电路的结构、工作原理和逻辑功能等进行了介绍。关于RTD/HEMT构成的更为复杂的电路,如多值逻辑、AD转换器以及RTD光电集成电路等将在本讲座最后部分进行讲解。     

一种适用于低压高速嵌入式应用的2T P沟道纳米晶存储器件

本文基于嵌入式应用的低压、高速要求,提出了一种基于2T结构的P沟道纳米晶存储新型结构。该器件采用带带隧穿激发热电子注入(BTBTIHE)的编程方式,可以同时实现高速、低功耗编程。同时采用2T结构以简化外围高压和读出电路。该器件具有良好的存储特性,包括高编程速度（5us编程脉冲下获得1.1V窗口）和优异的数据保持特性（在10年的保持时间电荷损失仅为20%）。该器件在嵌入式非挥发存储领域具有很强的应用潜力。     

可编程单芯片系统APEX 20系列

APEX 20系列将该公司原有系列产品ELEX 10K和FLEX 6000器件的查找表(look-up table-LUT)逻辑、MAX 7000器件的乘积项(product term)逻辑和FLEX 10K器件的增强型嵌入式存储块集成在一起,三种结构融进一个单独的芯之内,从而节省了板上空间,简化了设计过程。该系列集成密度突破百万门,支持64位/66MHz PCI标准。前所未有的高集成度可大大     

微控制器用作正弦波发生器

通过在微控制器存储器中存储预设值的方法,可以来将微控制器作为波形发生器使用。微控制器可以实现包括正弦波、三角波和锯齿波在内的所有类型的波形。本文探讨了如何通过在微控制器存储器中预先加载一组固定数值,从而生成正弦波的方法。同时还探讨了如何利用DAC将这些预设的数值转换为模拟输出。最后探讨了用来改变正弦波频率的机制。用来实现这一设计的器件是Cypress的子公司MicrosystemsTMPSoCTM(可编程系统芯片)器件。PSoC采用的是一个8位哈佛结构的微处理器,器件内部有16KB的可编程存储器(闪存),用以存储波形数据点。可以采用…     

壳层厚度对于量子点/聚合物复合电子存储器件性能的影响

研究了一种含有不同壳层结构量子点的聚乙烯咔唑(PVK)/Cd Se量子点复合体系电双稳器件,结果发现基于无壳层量子点的器件电荷存储能力较差,随着壳层厚度的增加,器件的电学特性由双稳态向三稳态转变。通过电容-电压(C-V)的测试结果表明,壳层的厚度对于量子点的电荷捕获能力有重要的影响,从而导致器件表现出不同的存储特性。     

含双层GST的低功耗CRAM存储元结构设计

基于热场分析,在CRAM存储元传统结构的加热层和底电极之间插入一层存储介质GST,设计出含双层GST的CRAM存储元结构.在模拟存储元热场分布过程中引入热辐射边界条件,使模拟结果更接近实际.根据设计要求,将双层GST新型结构与传统结构的热场进行比较,结果表明,含双层GST的新型结构一方面实现了存储元与CMOS晶体管的热兼容,增强了器件的稳定性;另一方面,将reset电流减小到0.5 mA,降低了器件功耗.     

一种基于DRAM的新型数字微镜器件设计

为了满足数字光处理系统(DLP)对其核心器件数字微镜器件(DMD)的高性能要求,文中提出了一种基于0.13μm CMOS工艺,采用DRAM存储的新型数字微镜器件。通过对DMD芯片结构、工作原理的分析提出一种新型数字微镜单元电路设计,对电路进行仿真验证并设计电路版图。经测试,该设计基本满足数字微镜器件开关时间、芯片良率、寿命等要求。     

创新的ispXPLD器件

ispXPLD(in—system programmableeXpanded PLD)器件是一种可以让用户有效地交替使用快速逻辑和块存储资源的PLD器件结构。这种结构允许每个多功能块都能实现逻辑功能(每个多功能块拥有多达32个宏单元)或存储功能(每个多功能块可多达16KB),从而使单个器件的存储容量高达1024个宏单元或512KB,等效于30万系统门。ispXPLD器     

嵌入式闪存器件技术进展

首先介绍了嵌入式闪存器件的基本工作原理,并根据具体的技术特点和应用整理归纳出了嵌入式闪存器件的三种主流单元结构:单晶体管器件结构、分裂栅器件结构和选择晶体管加存储晶体管的两管器件结构,然后详细分析和比较了这三种器件结构的优缺点。接着进一步重点介绍嵌入式闪存器件近年来的最新发展,列举了传统浮栅器件在65 nm技术代的先进解决方案,并讨论了融合分立电荷陷阱存储概念的新型SONOS和纳米晶存储技术,介绍了该类型技术较之传统浮栅结构的突出优势以及目前的研究进展。最后,对嵌入式闪存技术在32 nm以下节点将遭遇的瓶颈以及进一步发展方向进行分析和展望,给出了可能的解决方案。     

Synthetic-Aperture Radar Based on Nonsinusoidal Functions: VI-Pulse-Position and Pulse-Shape Coding

Previous papers of this series have used coded radio signals with desirable features, without explaining how these signals were obtained. This paper supplies the explanation. The concept of coding is generalized from the baseband signals, modulated onto sinusoidal carriers, to the radio signals actually transmitted. The conventional radar signals have coded baseband signals, which are referred to as the fine structure of the radar signals, while the carrier, referred to as the hyperfine structure, has always sinusoidal time variation. The more general radio signals discussed here have both a coded fine structure and hyperfine structure. Two classic problems of radar are readily solved by this generalized coding. 1) A class of signals is derived that approaches the ideal thumbtack ambiguity function in the range-Doppler domain as closely as one wants to. 2) The same class of signals makes it possible to increase the average-to- peak power ratio significantly over that achievable with frequency- modulated sinusoidal carriers. An estimate of the number of terms of a Fourier-series expansion of the signals, as well as the number of components of each term, is given; this estimate shows that a Fourier representation is too complicated for practical purposes, but also that the signals are ideal for frequency-sharing and spread-spectrum transmission.     

FRESH-DFE: A New Structure for Interference Cancellation

This paper proposes a new structure of decision feedback equalizer that exploits the cyclostationary properties of digitally modulated signals to mitigate interference. In the proposed structure, the forward filter of the conventional DFE is replaced by a cyclic filter. It is assumed that the desired and the interference signals use some mutually different signaling attributes, for example symbol rates, centre frequency etc. The resulting structure is evaluated in the presence of up to six strong interfering signals, a scenario that is typically found in wireless cellular systems. The proposed structure provides performance gains for some modulation formats but it reduces to the conventional DFE for other signal formats.     

On the use of kernel structure for blind equalization

The mathematical theory of kernel (null space) structure of Hankel and Hankel-like matrices is applied to the problem of blind equalization of cochannel signals. This approach provides a new perspective on the blind equalization problem and gives insights into the identifiability conditions already presented in the literature. An algorithm is presented that tracks the exact null space of the symbol matrix even in the presence of noise. This work exploits the shift structure in the oversampled channel output and the finite alphabet property of the signals. Previously, these two properties were used independently in a two-step (equalize then separate) process. A contribution of the new approach is that is allows simultaneous exploitation of both the shift structure and the finite alphabet property of the signals     

Optimal design of spectrum constrained analog signal sets with correlation analysis

This paper is concerned with the design of an optimal set of analog signals with prescribed magnitude spectrum and quadratic phase structure such that the maximum cross-correlation is minimized. An analytic expression for the maximum cross-correlation between two signals is derived through mathematical analysis. The optimal set of signals with the lowest maximum cross-correlation is explicitly characterized under certain conditions.     

Low-Power CMOS Analog Signal Processing Using Spatial Mapping

This paper presents a low-power analog circuit for signal processing on pulse coded signals using spatial mapping. By successively delaying a periodic pulse train, and correlating delayed copies of the input signal with the input signal itself, the frequency component(s) are mapped spatially to output signals. The single delay line structure is then extended to a parallel structure with redundancy. In this way, we improve the signal-to-noise ratio. The design has been simulated and fabricated, and both simulation measurement results are presented, indicating the feasibility of the proposed methods.     

一种提高SDH频带利用率的新方法

提出了一种提高ＳＤＨ网络频带利用率的方法，即三次群信号不是直接按照ＩＴＵ－ＴＧ，７０７建议映射是ＳＴＭ－１信号，而是将４个三次群信号复用为准四次后再进入ＳＴＭ－１信号，与ＩＴＵ－Ｔ规定的复用映射结构相比使频带利用率提高了３３％，并分析了此系统的性能。     

基于循环平稳分析的MPSK信号调制分类

提出了一种新的MPSK信号调制分类算法。通过对预处理后的MPSK信号进行循环平稳分析,把利用高阶累积量对复基带MPSK信号的调制分类推广到已调信号。由于高阶循环统计量具有抗平稳噪声的能力,从而在高阶循环累积量域构成了分类特征不变量。这种分类算法无需知道信号参数的先验信息,理论分析和实验结果证实了分类算法的有效性。     

一类非均匀采样信号的数字谱

本文对实际采样过程中出现的一类非均匀、非理想采样信号进行了频谱分析,得到了此类信号的数字谱表达形式,并对非均匀采样周期信号的数字谱进行了深入的研究,得到了其数字谱完整的表达形式及其一些重要性质,最后,给出了该理论的一个应用一分析数字合成周期信号的频谱及信噪比．     

Six-terminal MOSFET's: modeling and applications in highly linear,electronically tunable resistors

The electrical properties of a six-terminal MOSFET are studied and a strong-inversion model is derived. Due to its special structure, the six-terminal MOSFET can be operated as a highly-linear, electronically-tunable resistor. This is managed by applying proper voltages at the terminals of the structure, achieving channel uniformity independent of applied signals. Measurements on fabricated test devices yield distortion levels of -90 dB for 1 V_p-p signals     

基于盲信号分离的同频多信号测向技术

介绍了一种基于快速定点的盲分离算法,该算法可以对来自不同方向上的统计独立信号进行有效的分离,并且不需要预先知道信号的方向和阵列的结构流形。常规的干涉仪算法只能够对非同频信号测向,当多个信号频谱重叠时,无法准确获得单个信号的相位,因此采用干涉仪算法不能够实现对同频多信号测向。提出了一种基于盲信号分离结果的干涉仪测向算法,可以解决同频多信号的测向,进一步提高了干涉仪算法的应用前景。