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PCB optimization Design (ii) reprint

ground on the double-sided board are placed as close as possible to the edge of the plate and distributed on both sides of the plate. Multilayer boards can be installed in the inner layer of the power supply layer and ground layer, through the metallization hole and each layer of the power cord and ground connection.(11) When the pad and the larger area of the conductive area connected, should be the length of not less than 0.5mm thin wire for therma

Analysis of UV Laser Drilling Technology

1. Application Status of laser in Micropore Processing With the development of electronic products in portable and miniaturized directions, more and more demands are raised for circuit board miniaturization. For example, a circuit board of a modern mobile phone and a digital camera is installed with approximately 1200 cables per square centimeter. The key to improving the circuit board miniaturization level is the increasingly narrow line width and the smaller the line between different layers.

Professional PCB expressions in Chinese and English

: Logic Design Automation76. Split line: separated time77. layer: separated layer78. sequence: definite sequenceV. shape and size:1. Wire (Channel): conducting (track)2. Wire (body) width: conductor width3. Wire distance: conductor spacing4. Wire layer: conductor layer5. wire width/Spacing: conductor Line/Space6. First wire layer: conductor layer No.17. Circular Disk: Round pad8. Square pad9. Diamond Disk: Diamond pad10. rectangular pad: oblong pad11. Bullet-shaped disk: Bullet pad12. Tear Tray:

Decryption of mobile phone production process

appropriate to do draft tilt or C angle.2. Screw column of the structure of the screw column is the key to determine the strength of the machine, usually the motherboard will be reserved six screw column hole position, do not waste, Use it as much as you can. Screw column also has an important role is to fix the motherboard, the motherboard installed in which shell, screw column of the procedure also corresponding to some changes, screw column not on

Research on P2P communication methods through NAT

Content Overview: in P2P communication, problems caused by NAT (Network Address Translation) are well known, it causes the P2P client inside the NAT to be inaccessible regardless of the valid public IP address. Although a variety of NAT traversal technologies have been developed, there are few technical documents to prove the stability and advantages of these technologies. The purpose of this article is to describe and analyze the most widely used, reliable, and simple NAT traversal Technology i

Who is secretly starting your camera?

Who is secretly starting your camera? Text/image: erratic We are certainly not unfamiliar with this word, but few people will associate it with themselves, because everyone does not believe that this kind of thing will happen to themselves, however, you are far less likely to peek at others. The birth of the Internet makes it easier for us to work and learn, and also makes our privacy more vulnerable to hacker theft. On the Internet, there are a lot of video shoes circulating. the protagonists i

The minimum function dependency set (minimum coverage) for relation normalization

contain C, so ab→c is not a redundant function dependency and cannot be removed from the F1.    B Set Cg→b as a redundant function dependency, then remove Cg→b, get: F2={ab→c,d→e,d→g,c→a,be→c,bc→d,cg→d,acd→b,ce→a,ce→g}Calculation (CG) f2+: Set X (0) =CGCalculation x (1): Scan the F2 in the various function dependencies, find the left part of the CG or CG subset of the function dependency, get a c→a function dependency. So there are X (1) =x (0) ∪A=CGA

Uva1001-floyd algorithm-Build diagram

Given some balls, the time within the ball is zero, and the velocity between the balls is 10 per unit.Give two points to find the shortest time.Each ball as a point, the distance between the ball is Floyd D array. Then run it again FloydWA has two rounds because the D array is defined as int.#include #include#include#include#include#include#includestring>#include#include#include#includeSet>#includeusing namespacestd;Const intINF =100000;intn,m,t;Doubled[ the][ the];structholes{intx, Y, Z intR;}

Adapter mode in software design mode

What is the adapter mode? In computer programming, the adapter mode (sometimes called packaging style or packaging) adapts a class interface to what the user expects. The adapter can work together classes that cannot work together because of the incompatibility of interfaces, by encapsulating their own interfaces in an existing class. How does one implement the adapter?① Object Adapter mode-in this adapter mode, the adapter holds an instance of the class it wraps. In this case, the adapter call

Algorithm A General Polygon Clipping Library

is formed by contour nesting. Figure 1: A Polygon set with four contours. Figure 1 shows a polygon set comprised of four contours. Over-to-the-left is a seven sided concave contour. Lying completely within it is a four-sided contour, which forms a hole in the surrounding shape. A third, triangular contour intersects the boundary of the first. Finally, over-to-right is a disjoint self-intersecting four-sided contour. The interior of t

PCB Board Layer Introduction

frame of the board, the outside.Multi Layer (Multilayer) (silver) All wiring layers are included, the general single-sided plug-in pad on this layer, the flower line is all the layers are painted.1.TopLayer (top) top layer routing layer used to draw electrical connections between components.2.BottomLayer (bottom layer) layer of the underlying wiring, acting on top of the wiring layer.3.midlayer1 (middle layer 1) is the function of the multilayer board in this layer will also draw electrical cab

The second heap of the priority queue and the D-heap

as a Sentel, which will be described later. Therefore, the data structure of a heap is composed of an array, an integer representing the maximum value, and the size of the current heap.Heap Sequence The nature of fast operation execution is heap order. In a heap, for each node X, except for the root node (the root node has no parent node), the keywords in the father of X are smaller than (or equal to) X ). In Figure 3, the left side is the heap, and the right side is not (the dotted line indic

Heap and heap sorting

until the binary tree re-satisfies the stack's sequential attributes. Implementation Code: [Cpp]The insert operation spends constant time on average and logarithm time on the worst case.// It has been proved that one insert operation requires an average of 2.607 comparisons, so the average insert operation// Move up element layer 1.607.Template Void BinaryHeap {If (theSize + 1 = theArray. size ())TheArray. resize (theArray. size () * 2 );Int hole = +

TCP implements P2P communication, TCP traversing NAT, and TCP hitting

This title uses two Don's and three names. It is actually the same thing, but there are different sayings on the Internet, in addition, it seems that some people call TCP drilling. (My friend Niu asked me, "Do you want to punch the hole? Would you like to help me borrow an electric drill?" "~! · ¥ % ...... ·!"). Let's take a look at the technical background: The rapid development of the Internet and the limit on the number of IPv4 addresses make Netwo

"Five short chapters of Life" Wave break Nielsen

Chapter I.I walk the streets,There was a deep hole in the sidewalk,I dropped it in.I was lost ... I'm helpless.It's not my fault,It took a great effort to climb out.Chapter III walked down the same street,There was a deep hole in the sidewalk,I pretended not to see it,or fell in.I can't believe I fell in the same place.But it's not my fault,It took me a long time to climb out.Chapter IIII walked down the sa

Oracle Memory Management

(User globalArea): Global Area of the user. It consists of user session data, cursor status, and index area. In Shared Server mode, a shared service process is shared by multiple user processes.Pool or a portion of the large pool, while UGA is part of the PGA under a dedicated server. In dedicatred mode, the relationship between PGA and UGA is like the relationship between process and session. PGA serves the memory structure of the process and contains process information. UGA serves sessions,

The adapter mode for Java design mode

What is the adapter, said the text, the adaptation should be a verb, and the use of ancient prose should be used to make use of the law, translation into, so ... A device that fits the old things and works with new things.Once upon a time, I was fortunate enough to have sold a laptop, and it was there that I first heard the word adapter. A small black block connected to the power supply and computer, which indicates the properties of voltage, current and so on, this is the adapter. Here may be s

Malloc & free

The cosos kernel uses a kernel heap to manage memory. The kernel uses kmalloc and kfree to apply for and release memory from the Kernel Heap. The user State heap is also implemented in the library functions compiled by cosos for the user State. The application requests to release the memory from the heap through malloc and free. The Kernel Heap and user mode heap algorithms are similar. They call alloc and free_int to operate the heap. The following describes the implementation of the alloc and

Tolerance and Cooperation Plan 1

represents a hole, and a lowercase letter represents a axis. It is a series of 28 basic deviations between holes and shafts. From the Basic Deviation series, we can see that the Basic Deviation of the axis is from A to H, and is a negative value, and its absolute value decreases in turn; from J to 2C is the lower deviation (EI), and is a positive value, and its absolute value increases sequentially. The Basic Deviation from A to H of a

Simple Network check (2)

Article Title: Simple Network check (2 ). Linux is a technology channel of the IT lab in China. Includes basic categories such as desktop applications, Linux system management, kernel research, embedded systems, and open source. 2. confirm that there are no problems with the online devices such as the network line, hub, modem, and so on: Hardware:     After you have completed the network card check (please confirm that the network card can really work !!!), Check your network lines, hubs, and mo

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