PCB LAYOUT技術(shù)大全---初學(xué)者必看！
PROTEL相關(guān)疑問(wèn)
1.原理圖常見(jiàn)錯(cuò)誤：
（1）ERC報(bào)告管腳沒(méi)有接入信號(hào)：
a. 創(chuàng)建封裝時(shí)給管腳定義了I/O屬性;
b.創(chuàng)建元件或放置元件時(shí)修改了不一致的GRID屬性,管腳與線沒(méi)有連上;
c. 創(chuàng)建元件時(shí)pin方向反向,必須非pin name端連線。
（2）元件跑到圖紙界外：沒(méi)有在元件庫(kù)圖表紙中心創(chuàng)建元件。
（3）創(chuàng)建的工程文件網(wǎng)絡(luò)表只能部分調(diào)入pcb：生成netlist時(shí)沒(méi)有選擇為global。
（4）當(dāng)使用自己創(chuàng)建的多部分組成的元件時(shí),千萬(wàn)不要使用annotate.
2.PCB中常見(jiàn)錯(cuò)誤：
（1）網(wǎng)絡(luò)載入時(shí)報(bào)告NODE沒(méi)有找到：
a. 原理圖中的元件使用了pcb庫(kù)中沒(méi)有的封裝;
b. 原理圖中的元件使用了pcb庫(kù)中名稱不一致的封裝;
c. 原理圖中的元件使用了pcb庫(kù)中pin number不一致的封裝。如三極管：sch中pin number 為e,b,c, 而pcb中為1,2,3。
This a full 3-tier dababase application which includes a activex dll project(business objects) and a standard exe(UI). Besides all the database techniques it demonstrates, it also shows how to make MSHFlexGRID a editable GRID(with combobox, checkbox, datetimepicker) and how to merge a toolbar for multi forms.
This a very simple Yee algorithm 3D FDTD code in C implementing the free space form of Maxwell s equations on a Cartesian GRID. There are no internal materials or geometry. The code as delivered simulates an idealized rectangular waveguide by treating the interior of the mesh as free space/air and enforcing PEC (Perfect Electric Conductor) conditions on the faces of the mesh.
The C# program will display a mine field, plant mines, and provide hints on the number of mines around each GRID. The player can therefore enjoy a typical Minesweeper game on a Smartphone.
LINEINTRGAL Line Integral in a 2D Vector Field.
LINEINTRGAL(X,Y,U,V,C) computes the line integral along the lines given in cell array C.
X and Y define the coordinates of a rectangular GRID over which
U and V are defined. X and Y must be monotonic and 2D plaid as
％ produced by MESHGRID. X, Y, U, and V must all be the same size.
