Impact of elliptical cross-section on the propagation delay of multi-channel gate-all-around MOSFET based inverters

Multi-channel (MC) gate-all-around (GAA) metal-oxide-semiconductor field-effect transistor (MOSFET) is one of the promising candidates for the next-generation high performance devices. However, due to fabrication imperfections the cross-section of GAA devices may be ellipse-shaped having different major (a) and minor (b) axes, instead of the theoretically ideal round shape. The aspect ratio (AR), defined as a/b, of such elliptical GAA devices can vary depending on a and b. This introduces variability in the effective diameter, which in turn affect the performance parameters of circuits based on elliptical GAA MOSFETs. In the present work we have investigated the impact of diameter variability on the transient response of MC elliptical GAA MOSFET based CMOS inverters with a novel perspective. We have modeled the spread in the effective diameter by a parameter, σ, the standard deviation (SD), which may be thought of as a quantitative measure of the amount of variability introduced in the device. We have elaborated the ‘ON-Resistance’ method for calculating the propagation delay of MC GAA MOSFET based CMOS inverters. Computations were carried out to show the dependence of the propagation delay of such inverters on some important device/circuit parameters. We have also shown that even long channel elliptical devices can offer significant reduction of circuit delay (comparable to short channel devices) by proper tuning the effective diameter and number of channels, provided the admissible small dimensional effects have been taken into account.     

A Eu and Tb co-doped MOF-5 compound for ratiometric high temperature sensing

In this work, a new Eu and Tb co-doped luminescent compound based on MOF-5, [Zn₄O(BDC)₃], (named as compound 1) was successfully synthesized. The structure and morphology characterizations demonstrate that the initial framework of MOF-5 is retained well after co-doping Eu and Tb. The systematic investigations of photoluminescence behaviors reveal that the heat-treated compound 1 (called as compound 1a) can be utilized as a multi-channel readout luminescent thermometer in emission intensity ratio, decay time ratio, and luminescence color. It simultaneously exhibits the excellent repetitiveness and reversibility under high temperature region from 303 to 473?K. The relative sensitivity of 1.8%/K at 473?K is much higher than the best one of 1.19%/K previously reported for the mixed-lanthanide MOF Tb_0.8Eu_0.2BPDA. Until now, such a ratiometric luminescent thermometer with a high sensitivity at the temperature as high as 473?K has been rarely explored.     

Simulation of the electrostatic and transport properties of 3D-stacked GAA silicon nanowire FETs

This paper presents a detailed comparative study of the switching characteristics of resistive memory devices, with NiO or HfO₂ active materials and Pt electrodes, based on identical integration schemes. Material screening and qualification are performed using structural and composition analyses. Preliminary electrical investigations outline the non-polar switching behavior of both HfO₂ and NiO devices. Then, by using a specific test setup, we present a systematic comparative study of HfO₂ and NiO devices, clearly showing the tunability of the electrical characteristics with material type and process. HfO₂ devices lead to largest High Resistance State/Low Resistance State ratios and higher forming voltages compared to NiO cells, while reset voltages are similar. Data retention of both materials show highly stable Low Resistance State, while High Resistance State increases over time under 85 °C baking.     

Conciliating syntactic and semantic constraints for multi-phase and multi-channel region segmentation

In this paper, we propose a method to extend the multi-phase piecewise-constant segmentation method of Mumford and Shah to the multi-channel case. To this effect, we show that it is crucial to find an agreement between the syntactic constraint of obtaining regions that form a partition of the image space and the semantic constraint that attributes a formal meaning to the segmented regions. We elaborate from the work of Sandberg et al. that addresses the same problem in the binary (2-phase) case and we show that the agreement principle presented there, based on De Morgan’s law, cannot be generalized to the multi-phase case. Therefore, we base the agreement between syntactic and semantic constraints on another mathematical principle, namely the fundamental theorem of equivalence relation. After we give some details regarding the implementation of the method, we show results on brain MR T1-weighted and T2-weighted images, which illustrate the good behavior of our method, leading to robust joint segmentation of brain structures and tumors.     

基于TMS320DM6437的McBSP与EDMA实现串口通信

针对DSPTMS320DM6437,为了实现FPGA和DSP间的串口通信,采用了其同步多通道缓冲串行口（McBSP）和增强型直接存储器存取（EDMA）。软件程序设计未使用传统的芯片支持库,而是采用McBSPDriver和EDMALLD,实现了FPGA和DSP数据的连续双向传输,并且DSP作为接收方时采用乒乓缓存,防止数据丢失,同时利用DSP／BIOS实现了EDMA中断,可对收到的数据进行处理,保证了实时性和数据传输效率。     

交互式数据广播的伪交互方案

基于交互式数据广播的"伪交互"方案采用多路循环播发数据,用户在本机向网络提出接收的数据类型,并利用多路间时差选择最优路进行接收,实现"伪交互".循环播发路数根据预期用户数、容忍等待时间、终端机复杂程度、带宽资源、拥塞代价等因素确定,以解决网络赛拥塞问题.     

以双DSP为核心的FM-DCSK通信系统方案设计

采用FM-DCSK调制的混沌保密通信较其它混沌键控保密通信具有更优良的特性，但同时电路实现也更加复杂。DSP以其高效和灵活性在混沌通信中具有广阔的应用前景。文中根据TMS320C5402的特点，给出了用两块DSP来实现FM-DCSK通信系统的硬件方案，同时给出了系统独立工作时的硬件原理框图和软件设计流程。     

An Efficient Multi-hop Broadcast Protocol for Emergency Messages Dissemination in VANETs

Black-burst based multi-hop broadcast protocols are effective means to disseminate Emergency messages (EMs) in Vehicular ad hoc networks (VANETs). However, Clear to broadcast (CTB) collision will happen and reduce propagation speed. Aiming at this problem, we propose a Black-burst and multi-channel based multi-hop broadcast (BMMB) protocol. Vehicles with multiple antennas can transmit and sense black-burst at different channels simultaneously based on multi-channel technol-ogy. Compared with existing black-burst based methods, BMMB shortens the iterative procedure to find out the optimal segment. Only one relay vehicle can be rapidly se-lected within the optimal segment without CTB collision. BMMB enables alternative broadcast methods, i.e., uni-directional broadcast and multi-directional broadcast for straight roads and intersections respectively. Theoretical analysis is done for performance evaluation of BMMB, and simulation results demonstrate that BMMB performs better in terms of average one-hop delay and propagation speed.     

DTMB多通道调制器的设计与实现

在地面数字电视基站建设中,为了满足覆盖区域多套标清和高清节目的传播要求,常常需要配置多台数字电视激励器.为了简化基站设施建设,提高硬件复用,提出了一种多通道数字电视调制器解决方案,实现仅用一台激励器即可完成基站建设.以五通道DTMB调制器为例完成了在FPGA芯片上的实现.经过实际测试满足设计要求,具有较大的实用价值.