基于PROTEL的带通滤波器电路仿真分析

电路仿真在电路分析和设计中的地位越来越重要,它是检验电路设计的一种有效的手段。Protel DXP对电路进行设计仿真基本可以满足电路设计的要求,利用它可以节省时间和成本。文章介绍了Protel DXP的功能特点和利用Protel DXP进行电路仿真的基本步骤。最后,利用Protel DXP的仿真功能对带通滤波器进行了仿真,测量出带通滤波器的中心频率和带宽,而且对电路元件参数的确定进行了分析。     

PCB电路设计课程改革中的探索

本文对PCB电路设计课程的教学改革中如何选用PCB设计软件、如何选用PCB软件的版本、如何开展实物操作实践等几个比较突出的难题进行了探讨.     

Protel99SE在电子学教学中的应用

以运算放大器为例进行仿真和分析,介绍了Protel99SE软件在电子学仿真教学中的应用。     

Prote199仿真技术在电子电路设计中的应用

介绍目前电子工程师设计电子产品时 ,利用CAD技术及使用仿真软件对电路进行辅助分析 ,优化电路设计 ,提高产品开发进程及工作人员的效率。同时结合实例介绍Protel99软件对实际电子电路进行仿真分析的方法     

Protel 99在电子线路演示教学中的应用

本文阐述了利用Protel99绘制电路原理图和电路仿真的过程 ,举例说明Protel 99在电子线路演示教学中的应用 ,并比较它与传统演示教学法的特点     

基于Protel99 SE的负片光印覆铜板的PCB设计

指出了光印法制作PCB时有两种不同的感光材料即正性感光材料与负性感光材料之分;介绍了基于Protel99 SE的负性预涂布感光覆铜板的PCB设计方法;并简要给出了光印PCB的制作工艺。     

PROTEL99在PCB中的应用探讨

在Protel系列电路设计软件变成EDA(电路设计自动化)领域中举足轻重的领导软件的今天,学好和用好Protel系列电路设计软件变得十分必要。本文主要介绍Protel 99 PCB的制作要点及着重要注意的几个地方。     

两种EDA设计数据共性剖析与转换

针对异构EDA设计数据阻碍PCB元件组装模拟仿真技术实现的问题,以Protel与PowerPCB为例,分析了其物理参数的存储格式,证明了异构EDA设计文件数据存储存在共性,且可转换成统一格式,设计了异构EDA转换接口,解除了这一障碍,实现了以异构文件作为仿真驱动的关键技术.     

Investigating the role of ^99mTc-TRODAT-1 SPECT imaging in idiopathic Parkinson＇s disease

Objective: To investigate the role of 99mTc-TRODAT-1 SPECT in diagnosis and assessing severity of idiopathic Parkinson's disease (PD). Methods: Thirty-eight patients with primary, tentative diagnosis of PD and eighteen age-matched normal controls were studied with 99mTc-TRODAT-1 SPECT imaging. The regions of interests (ROIs) were drawn manually on cerebellum (CB), occipital cortex (OC) and three transverse plane slice-views of striatums, the semiquantitative BG (background)/[(OC CB)/2] were then calculated. Results: A lower uptake of 99mTc-TRODAT-Ⅰ in striatums were displayed in thirty-six out of thirty-eight PD patients by visual inspection, compared to controls. In twenty-four PD cases with HYS (Hoehn and Yahr scale) stage I, a greater loss of DAT uptake was found in striatum and its subregions contralateral striatum to the affected limbs than in the same regions of the controls, although the striatal uptake was bilaterally reduced. Using Spearman correlation analysis showed that the reduction of the uptake ratios significantly correlated with the UPDRS in striatum and all its subregions in the PD group (P＜0.05), a similar change was also found in the putamen by using the rating scale of Hoehn and Yahr (P＜0.05).However, analysis of variance (ANOVA) did not show any relationship between the decreasing uptake of 99mTc-TRODAT-1 and increasing severity of PD patients, although the specific uptake of 99mTc-TRODAT-Ⅰ was continuously decreased in the striatum by visual inspection with the progress of PD from HYS stage Ⅰ to Ⅲ. Conclusion: 99mTc-TRODAT- 1 SPECT imaging may serve as a useful method for improving the correct diagnosis of PD. In assessing the role of99mTc-TRODAT- 1 SPECT in disease severity of PD, UPDRS can offer a comprehensive index, although the Hoehn and Yahr assessment may be available in part.     

从Protel99 SE到Altium Designer

介绍了目前主流的印制电路板设计课程所用的软件,分析了部分学校延用旧版软件的原因,然后对Protel99SE和Altium Designer这两个版本作了对比。