In a recent discussion with a system designer, the requirementfor his power supply was to regulate 1.5Vand deliver up to 40A of current to a load that consistedof four FPGAs. This is up to 60W of power that must bedelivered in a small area with the lowest height profi lepossible to allow a steady fl ow of air for cooling. Thepower supply had to be surface mountable and operateat high enough effi ciency to minimize heat dissipation.He also demanded the simplest possible solution so histime could be dedicated to the more complex tasks. Asidefrom precise electrical performance, this solution had toremovethe heat generated during DC to DC conversionquickly so that the circuit and the ICs in the vicinity do notoverheat. Such a solution requires an innovative designto meet these criteria:
上传时间： 2013-11-24
上传用户：defghi010
以89S52单片机和EP1C6Q240C8型FPGA为控制核心的多功能计数器，是由峰值检波、A/D转换、程控放大、比较整形、移相网络部分组成,可实现测量正弦信号的频率、周期和相位差的功能。多功能计数器采用等精度的测量方法，可实现频率为1Hz～10MHz、幅度为0.01～5Vrms的正弦信号的精确测频，以及频率为10Hz～100kHz、幅度为0.5～5Vrms的正弦信号精确测相。液晶显示器能够实时显示当前信号的频率、周期和相位差。该多功能计数器精度高，界面友好，实用性强。 Abstract: A multi-function counter，which uses89S52MCU and EP1C6Q240C8FPGA as a control core，consists of peak detector，A/D conversion，program-controlled amplification，compared shaping and phase-shifting network part.The counter measures the frequency，period and phase of sinusoidal signal.With the equal precision method,the multi-function counter achieves the precise frequency measurement of the sinusoidal signal which its frequency is from1Hz to10MHz，its amplitude is from0.01Vrms to5Vrms，as well as the accurate phase measurement of the sinusoidal signal which its frequency is from10Hz to100kHz，its amplitude is from0.5Vrms to5Vrms.The LCD monitor real-time displays the frequency，period and phase difference of current signal.The multi-function counter features high precision，friendly interface，and strong practical.
上传时间： 2013-11-15
上传用户：gy592333
MQX最早是precise Software Technologies公司1989年开发，2009年飞思卡尔收购后，开放源代码。MQX采用微内核结构，具有标准的API接口、模块化架构、TCP/IP协议栈和USB协议栈等，因此无论在实时性、裁减性还是移植性上都具有卓越的性能.
上传时间： 2013-12-20
上传用户：dysyase
书名：基本商业程序的建模 Essential Business Process Modeling (Paperback) 作者： Mike Havey 出版商：O Reilly 1 edition (August 18, 2005) 内容介绍： Ten years ago, groupware bundled with email and calendar applications helped track the flow of work from person to person within an organization. Workflow in today s enterprise means more monitoring and orchestrating massive systems. A new technology called Business Process Management, or BPM, helps software architects and developers design, code, run, administer, and monitor complex network-based business processes. BPM replaces those sketchy flowchart diagrams that business analysts draw on whiteboards with a precise model that uses standard graphical and XML representations, and an architecture that allows it converse with other services, systems, and users.
标签： Essential Paperback Business Modeling
上传时间： 2015-10-21
上传用户：zhangyigenius
Written by the inventors of the technology, The Java™ Language Specification, Third Edition, is the definitive technical reference for the Java™ programming language. If you want to know the precise meaning of the language s constructs, this is the source for you. The book provides complete, accurate, and detailed coverage of the Java programming language. It provides full coverage of all new features added since the previous edition, including generics, annotations, asserts, autoboxing, enums, for-each loops, variable arity methods, and static import clauses.
标签： Specification technology the inventors
上传时间： 2016-01-26
上传用户：youmo81
The Kalman filter is a set of mathematical equations that provides an efficient computational [recursive] means to estimate the state of a process, in a way that minimizes the mean of the squared error. The filter is very powerful in several aspects: it supports estimations of past, present, and even future states, and it can do so even when the precise nature of the modeled system is unknown.
标签： computational mathematical equations efficient
上传时间： 2014-06-02
上传用户：yd19890720
In computer vision, sets of data acquired by sampling the same scene or object at different times, or from different perspectives, will be in different coordinate systems. Image registration is the process of transforming the different sets of data into one coordinate system. Registration is necessary in order to be able to compare or integrate the data obtained from different measurements. Image registration is the process of transforming the different sets of data into one coordinate system. To be precise it involves finding transformations that relate spatial information conveyed in one image to that in another or in physical space. Image registration is performed on a series of at least two images, where one of these images is the reference image to which all the others will be registered. The other images are referred to as target images.
标签： different computer acquired sampling
上传时间： 2013-12-28
上传用户：来茴
The Java Language Specification is the definitive technical reference for the Java programming language. It provides complete, accurate, and detailed coverage of the entire language and its syntax. If you want to know the precise meaning of Java s constructs, this is the source for you.
标签： Java Specification programming definitive
上传时间： 2017-04-10
上传用户：a673761058
ObsReduce is an MS Windows program that reduces observations of satellites relative to the background stars into their precise coordinates.
标签： observations satellites ObsReduce backgroun
上传时间： 2014-01-18
上传用户：上善若水
The software is written in assembler, as it is very short and it need the speed in the main loop. This is the heart of the synth. To be precise, it s in the 7 lines of assembler that makes up the main loop. The rest of the code is the wavetables and the communication code.
标签： assembler the software written
上传时间： 2017-05-17
上传用户：yxgi5
