电源

小型升压DC/DC稳压器AS1345提供100mA、200mA、350mA和500mA四种电感峰值电流限制的芯片版本,可以帮助设计师优化不同负载条件下的能效。AS1345有12V、15V和17V固定输出电压的芯片版本可供选择,设计师也可以选择5～18V之间的输出电压可调的芯片版本。     

模拟与数字芯片

正超低功耗数字隔离器ADuM144x基于ADI专有iCoupler数字隔离技术,可由低至1μW的功率供电,非常适合工业和仪器仪表系统,如4～20mA电流环路、远程传感器。ADuM144x是四通道数据隔离器,提供三种不同的通道配置,一分钟安全隔离额定值为2.5kVrms。其工作电压范围为2.25～3.6V,电压为2.5V时静态电源电流小于每通道5μA,速率为     

LT3668：降压型开关稳压器

Linear推出400mA、40V降压型开关稳压器LT3668,该器件具备双跟踪LDO输出,采用MSOP-16E封装。LT3668提供了一款完整和坚固的电源解决方案,适用于要求传感器电源紧密地跟踪测量ASIC电源的应用。LT3668在4．3V～40V的VIN．范围内工作,具60V瞬态保护,从而非常适合汽车和工业应用。其内部600mA开关可以提供高达400mA的电流,该电流分配给主输出和两个跟踪LDO组成的组合负载。     

一种自旋阀GMR隔离放大器设计

为了解决传统光电隔离、电容隔离和变压器隔离存在的线性度及频率特性等问题,设计了一种自旋阀巨磁阻（GMR）隔离放大器,具有灵敏度高、线性度好及结构简单等特点,且可以与硅等半导体电路集成。基于CSMC 0.5μm混合信号工艺,采用Tanner软件对电路进行编辑、仿真与验证。隔离器前端电路可将0～5 V的输入电压转换为1.4～10 mA电流,后端接收电路在增益为1时的共模抑制比为73 dB,增益可调节范围为1～200,工作带宽大于100 kHz,能满足恶劣环境条件下应用的各项指标要求。     

一种高精度宽电源范围集成电压基准源设计

在SOC及智能功率集成电路中,对基准电压源的电源电压范围及输出驱动电流都提出了更高的要求.基于csmc 40VBCD工艺设计并实现了一种输出精度高、驱动能力强、电源电压范围宽的5V集成基准电压源电路.设计中通过HV_PMOS实现电源电压和基准核心电路工作电压的隔离,拓宽了电源电压范围,采用双重电流负反馈保证了基准电压的高精度输出.通过Cadence软件平台下的Spectre仿真器对电路的各项电参数进行仿真验证,得到电源电压范围9～30V,在-20～125℃范围内温度系数5.688×10-6/℃,启动时间6.369μs,负载电流0～40mA,输出为5V的集成电压基准源电路.     

网站内容推荐

本月文章推荐:电动防眩目后视镜控制器丰富车门区电子模块的功能http://www.ednchina.com/0909-001.aspx电动防眩目(EC)镜是一种阻容等效负载:控制EC镜需要一个复杂的控制策略。EC镜在透明与颜色最深之间的电压是0V到1.2V;在颜色开始变深时,最大电流在150mA～250mA之间。     

数字面板表驱动电路MAX1367

MAX1367是一种低功耗3.5位数字面板表驱动单片IC。MAX1367集成了∑-△模数转换器、共阴极七段LED 驱动器、电压/电流转换器、电压数模转换器及4-20mA 或0～16mA 的电流驱动器。MAX1367不仅可用于数字面板表、电压表和万用表,而且还可用于自动测试设备及工业过程控制等领域。封装与内部结构MAX1367采用48引脚7mm×7mmTQFP 封装,引脚排列如图1所示。MAX1367高度集成了输入缓冲器、∑-△ADC、七段 LED 驱动器、电荷泵、2.048V 的参考电压、输出     

利用DAC/μP监控电路改善模拟I/O接口的可靠性

模拟控制信号常用于工业控制、可编程逻辑控制(PLC)、0-5V/0-10V/±5V/±10V数据采集器以及0-20mA电流环等系统,为保证系统安全可靠,一些模拟输出模块在微处理器(μP)与模拟电路之间引入了光电隔离.同样,为提高系统的可靠性,有些控制系统在μP失效时将模拟输出置于中间值或零.图1所示电路是针对该类应用提出的,该电路对μP的有效性进行监测,当检测到μP失效或电源电压跌落到所设置的门限值以下时将模拟输出置为零.该电路通过减少μP的I/O接口改善了平均故障时间间隔(MTBF).     

电源

可调节输出端的开关电源 SPS系列直流开关电源有三种类型,额定输出分别为0～18V(0～20A)、0～36V(0～10A)和0～60V(0～6A);所有输出都是连续可调的。在恒压方式,线和负载调整率为5mV或更好,在恒流方式时,线和负载调整率为3mA。     

电源

新型低压差线性稳压器该系列包括300mA、150mV压降的AP7335和600mA、300mV压降的AP7365,能够在以上工业温度范围内提供精度2%的可调及固定输出电压操作。这两款器件的宽输入电压范围为2～6V,可提供0.8～5V的可调输出电压以及0.8V、1.0V、1.2V、1.5V、     

一年之间，物换星移

去年的这个时候,供货商们还在为生存而挣扎。如今,2009年的年报已经公布,许多供应商的年报业绩之好,就连最乐观的分析师也始料未及。这种变化的原因很简单：供应商们大幅削减成本,接下来是强劲的需求,这又导致了随后高企的设备利用率。     

Building a in a flash supercomputer

A flash mob is a group of strangers, organized over the Internet, that comes together briefly, acts out a predetermined scenario-often something as simple as clapping for 30 seconds-and then disperses. A supercomputer is a very fast and powerful computer that outperforms most mainframes, at a cost, typically, of millions of dollars. Can a flash mob build a supercomputer? It can sure try, and so it did on 3 April at the University of San Francisco's Koret athletic center. The goal was to run the Linpack benchmark, a standard method of assessing the speed of supercomputers, to achieve a speed of at least 403 gigaflops (billion floating point operations per second). This would be fast enough to earn the system a place on the list of the world's fastest 500 supercomputers. The goal was not reached. The group reached just 180 gigaflops before it was time to pack up the computers and go home. However, even though the San Francisco effort fell short of speed goal, it did ignite imaginations.     

On a wing and a prayer

Aircraft giants Boeing and Airbus are pinning their hopes on very different visions of how air travel will evolve in the coming decade.     

Cooperative control of a human and a robot manipulator for positioning a cart on a frictionless plane

Robots may be expected to execute some tasks in cooperation with humans. Control systems for such robots should be appropriate to adapt to human characteristics in order to successfully accomplish the task. Pushing a cart on a frictionless plane in cooperation with a human is a basic example to such a task. To control the motion of an object from one point to another on a frictionless plane is impossible by only pushing in one direction without supporting it in the opposite direction, since as soon as the force is applied, the object will move without stopping its motion. In this paper, compliant cooperative positioning of a cart on a frictionless plane by a human and a manipulator is proposed using impedance control method with the parameters obtained from human–human cooperation.     

Analysis of a coaxial-to-waveguide adaptor including a discendedprobe and a tuning post

A field matching analysis of a coaxial-to-waveguide adaptor incorporating a disc-ended probe and a tuning post is presented. In this analysis, the tuning post is considered as a short-circuited second probe. A computer algorithm for calculating the input impedance of this structure is developed. This algorithm is used to investigate and improve the operation of a commercially available coaxial-to-waveguide adaptor     

Transmission-Line Properties of a Strip on a Dielectric Sheet on a Plane

The subject is a strip Iine formed of a strip and a parallel ground plane separated by a dielectric sheet (commonly termed "microstrip"). Building on the author's earlier papers all the significant properties are formulated in explicit form for practical applications. This may mean synthesis and/or analysis. Each formula is a close approximation for all shape ratios, obtained by a gradual transition between theoretical forms for the extremes of narrow and wide strips. The effect of thickness is formulated to a second-order approximation. Then the result is subjected to numerical differentiation for simple evaluation of the magnetic-loss power factor from the skin depth. The transition formulas are tested against derived formulas for overlapping narrow and wide ranges of shape. Some of these formulas are restated from the earlier derivations and others are derived herein. The latter include the second-order approximation for a narrow thin strip, and a close approximation for a narrow or wide square cross section in comparison with a circular cross section. Graphs are given for practical purposes, showing the wave resistance and magnetic loss for a wide range of shape and dielectric. For numerical reading, the formulas are suited for programming on a digital pocket calculator.     

基于智能手机压电基片上微液滴位置分析章

为了降低微流分析成本,该文提出了基于智能手机检测压电基片上目标微液滴方法,并开发出相应的应用软件,通过分析微液滴颜色信息和几何信息定位目标微液滴位置,结合分析时间获取微液滴输运速度。为验证提出方法的正确性,以5 μL黑色墨水溶液微液滴为研究对象,进行压电基片上微液滴识别和位置分析实验。结果表明,该文所提方法和开发的应用软件可识别和定位压电基片上微液滴,在功率为27.5 dBm时,第2~10 s段内微液滴输运速度为0.416 mm/s。     

The measurement of a large antenna using a spacecraft as a receiver

Two computational methods for obtaining the gain pattern of a large antenna using power levels recorded by a spacecraft are developed from the transmission equation. Nominally, the large antenna is linearly polarized while the spacecraft's receiving antennas are circularly polarized. Since the spacecraft has no attitude control system, the orientation of the receiving antennas is not known a priori nor its orientation the same from orbit to orbit. The first method relies on an independent spacecraft attitude determination system to furnish the orientation of the receiving antennas. It combines this information with receiving-antenna gain measurements to give the power level of the incident radiation. Losses due to polarization mismatch are taken into account, but polarization loss factors are not actually computed. The second method relates simultaneous measurements made by separate channels with separate receiving antennas. By solving a system of equations numerically, one can determine the direction of the incident radiation as well as its power level. This alleviates the need for an attitude determination system. These methods originated in the operations of the spacecraft NUSAT1 (northern Utah Satellite)