库文件 不全
上传时间: 2013-10-09
上传用户:王成林。
pcb库
上传时间: 2013-11-24
上传用户:文993
Altium Designer Winter09 最新PCB库,也是最全的。
上传时间: 2013-10-29
上传用户:dbs012280
培训资料
标签: com-Protel elecfans Designer Altium
上传时间: 2014-06-27
上传用户:源码3
Altium Designer下的封装库,整个库都是项目的积累,所有元件都通过项目测试,可靠快捷。此刻上传,奉献给大家,希望能不让更多的人受益。。。
上传时间: 2015-01-02
上传用户:1966640071
在Protel2004中进行PCB的完备的CAM输出。首先,我们可以输出的gerber文件, 操作如下:1:画好PCB后,在PCB 的文件环境中,左键点击File\Fabrication Outputs\Gerber Files,进入Gerber setup 界面
上传时间: 2013-11-24
上传用户:sevenbestfei
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
Calculation of the Differential Impedance of Tracks on FR4 substrates There is a discrepancy between calculated and measured values of impedance for differential transmission lineson FR4. This is especially noticeable in the case of surface microstrip configurations. The anomaly is shown tobe due to the nature of the substrate material. This needs to be considered as a layered structure of epoxy resinand glass fibre. Calculations, using Boundary Element field methods, show that the distribution of the electricfield within this layered structure determines the apparent dielectric constant and therefore affects theimpedance. Thus FR4 cannot be considered to be uniform dielectric when calculating differential impedance.
上传时间: 2013-10-18
上传用户:masochism
提出了一种基于Surendra改进的运动目标检测算法,通过对背景更新系数的改进,获取稳定准确的背景,再将背景帧与含运动区域的图像帧用差分运算获得运动目标图像。实验结果表明,该算法能够较快反应环境的变化,准确地获得背景图像,提高运动目标检测的准确性。
上传时间: 2013-11-19
上传用户:1234567890qqq
对传统混合高斯背景模型作了改进,消除了缓慢运动目标对背景模型的影响,其中提出了目标间差分方法区分出前后帧变化区,对不同区域采用不同的学习权重更新策略。通过实验证明,该改进算法提高了背景模型的健壮性,在跟踪系统中获得较好效果。
上传时间: 2015-01-03
上传用户:7891