工作環境設置及軟件安裝這章介紹工作環境的設置及軟件安裝方面知識。為什么要進行工作環境設置呢？因為現在的PCB 工程師要設計的文件很多。文件多了如果不進行管理就會很混亂，導致以后的維護十分困難。所以要從剛開始學習的時候養成一個好的操作習慣，這是很有必要的。2.1 建立自己的工作目錄在電腦的桌面上打開我的電腦，在我的電腦中打開D盤。在D 盤中建立三個文件夾。分別為“D：\EDA”“D：\EDA_LIB”“D：\EDA_PROJECT 三個文件夾”。如下圖所示：圖2-1-1 “建立工作目錄”建立好三個文件夾后，在這三個文件夾中分別另建立一個新文夾，并命名為Protel99se。三個文件夾的作用分別是：EDA文件夾是用來存放安裝文件；EDA—LIB 文件夾是用來存放元件庫。EDA—PROJECT 文件夾是用來存放設計數據。2.2 對Protel 99se 進行安裝設置好工作目錄后，就可以對軟件進行安裝。圖2-1-2就是Protel 99se的安裝程序。其中“Protel99SP6”是升級補丁，“Protel99 漢化”是漢化文件。（1）雙擊Setup 安裝圖標對軟件進行安裝。
上傳時間： 2013-11-16
上傳用戶：swz13842860183
上圖為protel99se setup安裝圖片。此版本為protel99se軟件，里面包含有漢化工具，可以直接進行漢化。內含注冊信息。并可以免費下載。 使用序列號：SerialNo:NG9A-JVDN-Z4SK-CTTP
上傳時間： 2014-03-26
上傳用戶：dancnc
15.2 已經加入了有關貫孔及銲點的Z軸延遲計算功能. 先開啟 Setup - Constraints - Electrical constraint sets 下的 DRC 選項. 點選 Electrical Constraints dialog box 下 Options 頁面 勾選 Z-Axis delay欄.
上傳時間： 2013-10-08
上傳用戶：王慶才
One of the most misunderstood constructs in the Verilog language is the nonblockingassignment. Even very experienced Verilog designers do not fully understand how nonblockingassignments are scheduled in an IEEE compliant Verilog simulator and do not understand whenand why nonblocking assignments should be used. This paper details how Verilog blocking andnonblocking assignments are scheduled, gives important coding guidelines to infer correctsynthesizable logic and details coding styles to avoid Verilog simulation race conditions
上傳時間： 2013-10-17
上傳用戶：tb_6877751
Methods for designing a maintenance simulation training system for certain kind of radio are introduced. Fault modeling method is used to establish the fault database. The system sets up some typical failures， follow the prompts trainers can locate the fault source and confirm the type to accomplish corresponding fault maintenance training. A training evaluation means is given to examining and evaluating the training performance. The system intuitively and vividly shows the fault maintenance process， it can not only be used in teaching， but also in daily maintenance training to efficiently improve the maintenance operation level. Graphical programming language LabVIEW is used to develop the system platform.
上傳時間： 2013-11-19
上傳用戶：3294322651
Quartus_II_11.0_x86破解器下載方法： 首先安裝Quartus II 11.0軟件（默認是32/64-Bit一起安裝)： 用Quartus_II_11.0_x86破解器(內部版).exe破解C:\altera\11.0\quartus\bin下的sys_cpt.dll文件（運行Quartus_II_11.0_x86破解器(內部版).exe后,直接點擊“應用補丁”，如果出現“未找到該文件。搜索該文件嗎？”，點擊“是”，（如果直接把該破解器Copy到C:\altera\11.0\quartus\bin下，就不會出現這個對話框，而是直接開始破解！）然后選中sys_cpt.dll，點擊“打開”。安裝默認的sys_cpt.dll路徑是在C:\altera\11.0\quartus\bin下）。 把license.dat里的XXXXXXXXXXXX 用您老的網卡號替換(在Quartus II 11.0的Tools菜單下選擇License Setup，下面就有NIC ID)。 在Quartus II 11.0的Tools菜單下選擇License Setup，然后選擇License file，最后點擊OK。 注意：license文件存放的路徑名稱不能包含漢字和空格，空格可以用下劃線代替。 此軟件已經通過了諾頓測試，在其它某些殺毒軟件下，也許被誤認為是“病毒”，這是殺毒軟件智能化程度不夠的原因，所以只能暫時關閉之。
標簽： Quartus_II 11.0 86 破解
上傳時間： 2013-11-01
上傳用戶：hebmuljb
Abstract: Most magnetic read head data sheets do not fully specify the frequency-dependent components andare often vague when specifying other key parameters. In some cases, the specifications of two very similarheads from two different manufacturers might be quite different in terms of parameters specified and omitted.The limitations in the data sheets make designing an optimum card reading system unnecessarily difficult andtime consuming. This document outlines a strategy to overcome the above shortcomings and offers guidelinesto overcome the noise issues.
上傳時間： 2013-11-13
上傳用戶：dysyase
Abstract: Perfection is relative and application specific. The perfect race car is not the car we use to commute to work. We need products for everyday use that are high quality, affordable, and solidly reliable. There will be times when we must use components that are not perfect, and this is when calibration becomes important. Calibration techniques reduce tolerances in imperfect manufacturing equipment while maintaining affordability.
標簽： 校準
上傳時間： 2013-10-09
上傳用戶：哈哈hah
A MEMS microphone IC is unique among Analog Devices, Inc., products in that its input is an acoustic pressure wave. For this reason, some specifications included in the data sheets for these parts may not be familiar, or familiar specifications may be applied in unfamiliar ways. This application note explains the specifica-tions and terms found in MEMS microphone data sheets so that the microphone can be appropriately designed into a system.
上傳時間： 2013-10-31
上傳用戶：masochism
Abstract: A laser module designer can use a fixed resistor, mechanical pot, digital pot, or a digital-to-analogconverter (DAC) to control the laser driver's modulation and bias currents. The advantages of a programmablemethod (POT or DAC) are that the manufacturing process can be automated and digital control can be applied(e.g., to compensate for temperature). Using POTs can be a more simple approach than a DAC. There can be aslight cost advantage to using a POT, but this is usually not significant relative to other pieces of the design.Using a DAC can offer advantages, including improved linearity (translating to ease of software implementationand ability to hit the required accuracy), increased board density, a wider range of resolutions, a betteroptimization range, ease of use with a negative voltage laser driver, and unit-to-unit consistency
上傳時間： 2013-11-13
上傳用戶：ca05991270
