ExpressPCB 是一款免费的PCB设计软件，简单实使。可以画双层板。 Our Free PCB software is a snap to learn and use. For the first time, designing circuit boards is simple for the beginner and efficient for the professional. Our board manufacturing service makes top quality two and Four layer PCBs. Use our MiniBoard service and pay only $51 for three boards (plus $8 shipping).
标签： ExpressPCB PCB 设计软件
上传时间： 2013-11-15
上传用户：lchjng
ExpressPCB 是一款免费的PCB设计软件，简单实使。可以画双层板。 Our Free PCB software is a snap to learn and use. For the first time, designing circuit boards is simple for the beginner and efficient for the professional. Our board manufacturing service makes top quality two and Four layer PCBs. Use our MiniBoard service and pay only $51 for three boards (plus $8 shipping).
标签： ExpressPCB PCB 设计软件
上传时间： 2013-10-09
上传用户：1047385479
为了在CDMA系统中更好地应用QDPSK数字调制方式，在分析四相相对移相（QDPSK)信号调制解调原理的基础上，设计了一种QDPSK调制解调电路，它包括串并转换、差分编码、四相载波产生和选相、相干解调、差分译码和并串转换电路。在MAX+PLUSⅡ软件平台上，进行了编译和波形仿真。综合后下载到复杂可编程逻辑器件EPM7128SLC84-15中，测试结果表明，调制电路能正确选相，解调电路输出数据与QDPSK调制输入数据完全一致，达到了预期的设计要求。 Abstract: In order to realize the better application of digital modulation mode QDPSK in the CDMA system， a sort of QDPSK modulation-demodulation circuit was designed based on the analysis of QDPSK signal modulation-demodulation principles. It included serial/parallel conversion circuit, differential encoding circuit, Four-phase carrier wave produced and phase chosen circuit, coherent demodulation circuit, difference decoding circuit and parallel/serial conversion circuit. And it was compiled and simulated on the MAX+PLUSⅡ software platform,and downloaded into the CPLD of EPM7128SLC84-15.The test result shows that the modulation circuit can exactly choose the phase，and the output data of the demodulator circuit is the same as the input data of the QDPSK modulate. The circuit achieves the prospective requirement of the design.
上传时间： 2013-10-28
上传用户：jyycc
The data plane of the reference design consists of a configurable multi-channel XBERT modulethat generates and checks high-speed serial data transmitted and received by the MGTs. Eachchannel in the XBERT module consists of two MGTs (MGTA and MGTB), which physicallyoccupy one MGT tile in the Virtex-4 FPGA. Each MGT has its own pattern checker, but bothMGTs in a channel share the same pattern generator. Each channel can load a differentpattern. The MGT serial rate depends on the reference clock frequency and the internal PMAdivider settings. The reference design can be scaled anywhere from one channel (two MGTs)to twelve channels (twenty-Four MGTs).
上传时间： 2013-12-25
上传用户：jkhjkh1982
基于通用集成运算放大器，利用MASON公式设计了一个多功能二阶通用滤波器，能同时或分别实现低通、高通和带通滤波，也能设计成一个正交振荡器。电路的极点频率和品质因数能够独立、精确地调节。电路使用4个集成运放、2个电容和11个电阻，所有集成运放的反相端虚地。利用计算机仿真电路的通用滤波功能、极点频率和品质因数的独立控制和正交正弦振荡，从而证明该滤波器正确有效。 Abstract: A new multifunctional second-order filter based on OPs was presented by MASON formula. Functions， such as high-pass， band-pass， low-pass filtering， can be realized respectively and simultaneously， and can become a quadrature oscillator by modifying resistance ratio. Its pole angular frequency and quality factor can be tuned accurately and independently. The circuit presented contains Four OPs， two capacitors， and eleven resistances， and inverting input of all OPs is virtual ground. Its general filtering， the independent control of pole frequency and quality factor and quadrature sinusoidal oscillation were simulated by computer， and the result shows that the presented circuit is valid and effective.
上传时间： 2013-10-09
上传用户：13788529953
本书是关于设计的，多年来我一直从事这项工作。基本上说，从我第一次试着阅 读《设计模式》（Gamma, Helm,Johnson & Vlissides, Addison-Wesley, 1995，通常 1 被称作“四人帮 （Gang of Four）”或者 GOF）这本书开始。
标签：
上传时间： 2013-12-12
上传用户：luopoguixiong
The purpose of this computer program is to allow the user to construct, train and test differenttypes of artificial neural networks. By implementing the concepts of templates, inheritance andderived classes from C++ object oriented programming, the necessity for declaring multiple largestructures and duplicate attributes is reduced. Utilizing dynamic binding and memory allocationafforded by C++, the user can choose to develop Four separate types of neural networks:
标签： differenttype construct computer purpose
上传时间： 2013-12-06
上传用户：13517191407
基于simulink的uwb仿真 uwb.mdl: UWB model - open this to begin. uwb_lib.mdl: Library blocks for UWB model. uwb_init.m: Initialization called before model is loaded. uwb_settings: Sets up structure containing system parameters ( uwb in workspace). uwb_imr.m: Initializes UWB channel impulse response. uwb_sv_*.m: Four M-files used to generate channel impulse responses (MAT files).
上传时间： 2013-12-22
上传用户：gengxiaochao
Title: STL Tutorial and Reference Guide: C++ Programming with the Standard Template Library (2nd Edition) Author: David R. Musser / Gillmer J. Derge / Atul Saini / Gilmer J. Derge Publisher: Addison-Wesley Page: 560 Edition: 2nd edition (March 27, 2001) Format: PDF Summary: The Standard Template Library was created as the first library of genetic algorithms and data structures, with Four ideas in mind: generic programming, abstractness without loss of efficiency, the Von Neumann computation model, and value semantics. This guide provides a tutorial, a description of each element of the library, and sample applications. The expanded second edition includes new code examples and demonstrations of the use of STL in real-world C++ software development it reflects changes made to STL for the final ANSI/ISO C++ language standard.
标签： Programming Reference Standard Template
上传时间： 2014-01-19
上传用户：netwolf
本文简要介绍了集成电路MAX038的性能，并给出了以MAX038波形产生器为核心具有四种输出波形的函数 信号发生器的设计方案。用这种方法设计的信号发生器具有结构简单、成本低、体积小等特点，很好地满足 了一般的实验要求。 关键词：集成电路 信号发生器 频率 Abstract：The performance ofIC_MAX038 was introduced briefly in this paper．At the sa／ne time，a signal generator design making with integrated circuit MAX038 is provided，which can produce Four kinds of waveforms output．The signal generator was of characters such as simple structur，cheap expense，small volume and SO on．The signal generator contents the demand of general experiments very wel1． Key words：Integrated circuit Signal generator Frequency
上传时间： 2013-12-12
上传用户：四只眼
