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1.
根据不同直流电压基准源芯片的温度漂移互相独立的特点,研究单个电压基准源芯片输出的温度特性,提出一种利用平均值电路降低基准电压温度漂移系数的方法。实验结果表明:温度系数最优为4.5μV/℃的4个基准源芯片,经过平均电路融合输出后,温度系数减小到2.46μV/℃,可以有效地降低直流电压基准的温度漂移系数。  相似文献   

2.
基于Global Foundry(GF)0.18μm标准CMOS工艺,设计了用于安全芯片的高性能温度监测传感器。该传感器利用PN结正向偏置电压与温度的近似线性关系监测环境温度变化,其集成度高、可靠性高、功耗低,并且能够在宽温度范围内正常工作。测试结果表明:在一定温度范围(-50-140℃)内,其温度系数为-4.47mV/℃,线性度良好;当电源电压为3.3V时,功耗仅为10.04μW,满足安全芯片的设计要求。  相似文献   

3.
一种带曲率补偿的基准及过温保护电路   总被引:1,自引:0,他引:1  
介绍了一种低温漂的 BiCMOS 带隙基准电压源及过温保护电路。采用 Brokaw 带隙基准核结构,通过二阶曲率补偿技术,设计了一种在-40℃~+160℃的温度变化范围内温度系数为25ppm/K、输出电压为1.2±0.000 5V 的带隙基准电压源电路。电源电压抑制比典型情况下为72dB。这种用于内部集成的带热滞回功能的过温保护电路,过温关断阈值温度为160℃,温度降低,安全开启阈值温度140℃,设计的热滞回差很好地防止了热振荡现象。  相似文献   

4.
基于TSMC 0.18μm标准CMOS工艺,提出了一种新型无电阻低温漂电压基准源。通过采用CMOS阈值电压(Vth)和与温度成正比的电压(VPTAT)作为基础线性温度单元加权求和的方式,消除了电压基准源输出中残留的非线性温度分量,最终得到高精度的电压基准输出。其中CMOS阈值电压由无电阻结构产生,VPTAT的产生和与CMOS阈值电压的加权求和由非对称差分运放完成。实测结果证明,在-55℃~125℃温度范围内,电压基准源输出为1.23 V,温度系数为4.5 ppm/℃。在无滤波电容的情况下,基准电源抑制比可达-93 dB。  相似文献   

5.
提出了一款应用于RF无线收发芯片的高精度电流偏置电路。综合考虑功耗、面积和失调电压对基准电压的影响,设计了一款符合实际应用的带隙基准电路。并以带隙基准电路作基准电流源的偏置,采用电压电流转换器结构设计了具有高电源电压抑制比(PSRR)的基准电流源。电流镜采用辅助运放的设计方法来提高电流镜的输出阻抗,减小沟道调制效应对输出的基准电流的影响,从而提高输出基准电流的精度。采用0.35μzmCMOS工艺设计芯片版图,版图面积为0.18mm^2。提取寄生参数(PEX)仿真结果表明,该电路在-55℃~+90℃范围内的温度系数为15.5ppm/℃,室温下基准电压为1.2035V;在低频段电流源的电源抑制比为90dB;在外接电阻从1kΩ~400kΩ变化时,输出基准电流误差范围是0.0001μA。  相似文献   

6.
基于IBM 0.18μm SiGe BICMOS工艺,采用温度脉冲转换方式设计了一种应用于无源RFID标签的温度传感器。与绝对温度呈正比(PTAT)的电流源和电流饥饿环型振荡器产生频率与温度呈正相关的振荡信号,作为计数器的时钟信号;用数字模块对接收的帧头代码进行处理得到一个宽度为200μs的脉冲信号,作为计数器的使能信号;利用时域数字量化方式就可以得到不同温度下的数字信号。温度传感器总面积为0.03 mm2,温度在-100~120℃范围内变化时,振荡器输出频率范围由800 kHz~1.8 MHz。在1.8 V电源电压下,温度传感器平均输出电流约为13μA,芯片测试结果的有效分辨率可以达到0.864 LSB/℃。  相似文献   

7.
根据汽车发动机控制芯片的工作环境,针对常见的温度失效问题,提出了一种应用在发动机控制芯片中的带隙基准电压源电路。该电路采用0.181.LmCMOS工艺,采用电流型带隙基准电压源结构,具有适应低电源电压、电源抑制比高的特点。同时还提出一种使用不同温度系数的电阻进行高阶补偿的方法,实现了较宽温度范围内的低温度系数。仿真结果表明,该带隙基准电路在一50℃~+125℃的温度范围内,实现平均输出电压误差仅5.2ppm/℃,可用于要求极端严格的发动机温度环境。该电路电源共模抑制比最大为99dB,可以有效缓解由发动机在
Abstract:
The paper presents a bandgap reference power source, which is designed to accommodate the wide range temperature environment for engine control modules and to avoid circuit invalidation caused by temperature. The bandgap reference based on current summing  相似文献   

8.
利用亚阈值CMOS管的Ⅰ-Ⅴ指数工作特性,对三级管VBE电压的负温度系数进行补偿,实现了一种针对安全芯片应用需求的新型基准源。该基准源核心结构是使用亚阈值CMOS管搭建缓冲运放,实现6级温度补偿,输出1 V基准电压。所提出的基准源使用SMIC 180 nm工艺实现,并通过Spectre仿真验证:全温区-40℃~125℃内,基准电压变化范围小于1 mV;该基准源典型功耗4.5μA;对低功耗高精度基准源的研究具有很强的实用性和指导意义。  相似文献   

9.
非制冷红外焦平面阵列(IRFPA)读出电路由于工艺制造或受环境条件的影响在正常运行时会产生非均匀性。本文针对传统电路存在非均匀性这一问题,设计了基于12μm像元的非均匀性校正电路,该新型非均匀校正电路采用共源共栅电流镜产生电流,并且通过调节比例电流支路输出不同比例的电流,加入放大器负反馈结构提高电流精度,对像元阵列产生的非均匀性进行补偿。在TSMC 0.18μm工艺条件下进行仿真测试,新型校正电路进行校正之后,校正电流为368nA,积分电流为44.24nA,积分电路(CTIA)输出电压为3.81V,积分时间缩短为255.43ns,在不同的温度条件下,非均匀性问题降为3%以下,输出电压更稳定,满足设计条件。  相似文献   

10.
提出一种基于通用交叉耦合电平转换器的低开销新型物理不可克隆函数的电路设计。该设计只需在传统电平转换电路中引入一个额外的开关晶体管,用来切换电平转换器的差分工作模式和共模工作模式,利用交叉耦合网络中两个 PMOS 晶体管由于开关速度不同所引起的输出电压的不确定性,通过共模模式输出获取所必需的熵值。该电路采用标准65 nm CMOS工艺进行设计,仿真结果显示该PUF的唯一性为49.11%,接近理想值。在电压为1.0~1.5V内,可靠性可达96.09%,而在环境温度为-20~100 ℃内,可靠性可达95.31%。同时在高速吞吐率为20Mbit/s时,每比特输出能耗仅为0.72 pJ(1.2 V,27 ℃)。  相似文献   

11.
Abstract This paper describes an approach to the design of interactive multimedia materials being developed in a European Community project. The developmental process is seen as a dialogue between technologists and teachers. This dialogue is often problematic because of the differences in training, experience and culture between them. Conditions needed for fruitful dialogue are described and the generic model for learning design used in the project is explained.  相似文献   

12.
European Community policy and the market   总被引:1,自引:0,他引:1  
Abstract This paper starts with some reflections on the policy considerations and priorities which are shaping European Commission (EC) research programmes. Then it attempts to position the current projects which seek to capitalise on information and communications technologies for learning in relation to these priorities and the apparent realities of the marketplace. It concludes that while there are grounds to be optimistic about the contribution EC programmes can make to the efficiency and standard of education and training, they are still too technology driven.  相似文献   

13.
融合集成方法已经广泛应用在模式识别领域,然而一些基分类器实时性能稳定性较差,导致多分类器融合性能差,针对上述问题本文提出了一种新的基于多分类器的子融合集成分类器系统。该方法考虑在度量层融合层次之上通过对各类基多分类器进行动态选择,票数最多的类别作为融合系统中对特征向量识别的类别,构成一种新的自适应子融合集成分类器方法。实验表明,该方法比传统的分类器以及分类融合方法识别准确率明显更高,具有更好的鲁棒性。  相似文献   

14.
Development of software intensive systems (systems) in practice involves a series of self-contained phases for the lifecycle of a system. Semantic and temporal gaps, which occur among phases and among developer disciplines within and across phases, hinder the ongoing development of a system because of the interdependencies among phases and among disciplines. Such gaps are magnified among systems that are developed at different times by different development teams, which may limit reuse of artifacts of systems development and interoperability among the systems. This article discusses such gaps and a systems development process for avoiding them.  相似文献   

15.
This paper presents control charts models and the necessary simulation software for the location of economic values of the control parameters. The simulation program is written in FORTRAN, requires only 10K of main storage, and can run on most mini and micro computers. Two models are presented - one describes the process when it is operating at full capacity and the other when the process is operating under capacity. The models allow the product quality to deteriorate to a further level before an existing out-of-control state is detected, and they can also be used in situations where no prior knowledge exists of the out-of-control causes and the resulting proportion defectives.  相似文献   

16.
Going through a few examples of robot artists who are recognized worldwide, we try to analyze the deepest meaning of what is called “robot art” and the related art field definition. We also try to highlight its well-marked borders, such as kinetic sculptures, kinetic art, cyber art, and cyberpunk. A brief excursion into the importance of the context, the message, and its semiotics is also provided, case by case, together with a few hints on the history of this discipline in the light of an artistic perspective. Therefore, the aim of this article is to try to summarize the main characteristics that might classify robot art as a unique and innovative discipline, and to track down some of the principles by which a robotic artifact can or cannot be considered an art piece in terms of social, cultural, and strictly artistic interest. This work was presented in part at the 13th International Symposium on Artificial Life and Robotics, Oita, Japan, January 31–February 2, 2008  相似文献   

17.
《计算机科学》2007,34(4):148-148
Recent years have seen rapid advances in various grid-related technologies, middleware, and applications. The GCC conference has become one of the largest scientific events worldwide in grid and cooperative computing. The 6th international conference on grid and cooperative computing (GCC2007) Sponsored by China Computer Federation (CCF),Institute of Computing Technology, Chinese Academy of Sciences (ICT) and Xinjiang University ,and in Cooperation with IEEE Computer Soceity ,is to be held from August 16 to 18, 2007 in Urumchi, Xinjiang, China.  相似文献   

18.
Although there are many arguments that logic is an appropriate tool for artificial intelligence, there has been a perceived problem with the monotonicity of classical logic. This paper elaborates on the idea that reasoning should be viewed as theory formation where logic tells us the consequences of our assumptions. The two activities of predicting what is expected to be true and explaining observations are considered in a simple theory formation framework. Properties of each activity are discussed, along with a number of proposals as to what should be predicted or accepted as reasonable explanations. An architecture is proposed to combine explanation and prediction into one coherent framework. Algorithms used to implement the system as well as examples from a running implementation are given.  相似文献   

19.
为了设计一种具有低成本、低功耗、易操作、功能强且可靠性高的煤矿井下安全分站,针对煤矿安全生产实际,文章提出了采用MCS-51系列单片机为核心、具有CAN总线通信接口的煤矿井下安全监控分站的设计方案;首先给出煤矿井下安全监控分站的整体构架设计,然后着重阐述模拟量输入信号处理系统的设计过程,最后说明单片机最小系统及其键盘、显示、报警、通信等各个组成部分的设计;为验证设计方案的可行性与有效性,使用Proteus软件对设计内容进行仿真验证,设计的煤矿井下安全监控分站具有瓦斯、温度等模拟量参数超标报警功能和电机开停、风门开闭等开关量指示功能;仿真结果表明:设计的煤矿井下安全监控分站具有一定的实际应用价值.  相似文献   

20.
This paper provides the author's personal views and perspectives on software process improvement. Starting with his first work on technology assessment in IBM over 20 years ago, Watts Humphrey describes the process improvement work he has been directly involved in. This includes the development of the early process assessment methods, the original design of the CMM, and the introduction of the Personal Software Process (PSP)SM and Team Software Process (TSP){SM}. In addition to describing the original motivation for this work, the author also reviews many of the problems he and his associates encountered and why they solved them the way they did. He also comments on the outstanding issues and likely directions for future work. Finally, this work has built on the experiences and contributions of many people. Mr. Humphrey only describes work that he was personally involved in and he names many of the key contributors. However, so many people have been involved in this work that a full list of the important participants would be impractical.  相似文献   

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