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In this article, we will teach you how to do a PCB design easily 25-30
One of the main purposes of the design of the circuit schematic is to provide a network table for the design of the PCB board and to prepare the basis for the design of the pcb board.
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PCB is a support for circuit components and devices in electronic products. It provides electrical connections between circuit components and devices. With the rapid development of electricity technology, the density of PGB is getting higher and higher. PCB design has a great impact on the ability to interfere with interference. Therefore, when designing PCBs. The general principles of PCB design must be followed and should meet the requirements for anti-interference design.
When the system is operating at 50MHz, transmission line effects and signal integrity issues will occur; when the system clock reaches 120MHz, PCBs based on traditional methods will not work unless high speed circuit design knowledge is used. Therefore, high-speed circuit design technology has become a design tool that electronic system designers must adopt. The controllability of the design process can only be achieved by using the design techniques of high-speed circuit designers.
In this case, we need to make holes in the board so that the pins can pass through the board to the other side, so the parts are soldered to the other side. Because of this, the front and back sides of the PCB are called the Component Side and the Solder Side.
There are also two ways of layout, manual routing and automatic routing. PowerPCB provides manual routing capabilities that are powerful, including automatic push and online design rule checking (DRC). Automatic routing is performed by Specctra's cabling engine. Usually these two methods work together. The common steps are manual-auto-manual.
Protel99's electrical layer is divided into two types, open a PCB design document press, shortcut L, there is a layer settings window. The SIGNAL LAYER on the left is a positive layer, including TOP LAYER, BOTTOM LAYER, and MIDLAYER, and the middle one (INTERNAL PLANES) is a negative layer, ie INTERNAL LAYER. Both layers have completely different properties and methods of use.
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PCB layout design to analyze the circuit board unit, based on the function of the layout design, layout of all the components of the circuit, to comply with the following principles.
At the moment, users most need a tool that combines timing analysis and SI, and the interface is optimized for easy setup and includes Design KIT.
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Designers may design odd-numbered printed circuit boards (PCBs). If the wiring does not require an extra layer, why use it? Isn't reducing layers not making the board thinner? If the board is one less layer, is the cost lower? However, in some cases, adding a layer will reduce the cost.
8 Q&A in PCB Circuit Layout Design
4. Drilling Editing 5. Drilling Outline Drawing 6. Circuit Layer
Multi-layer and double-sided PCB design is similar, and even easier.
A number of issues that should be noted for PCB board reliability design in high speed DSP systems.
Signal Integrity is a state in which the signal is not damaged. It shows that the signal maintains its correct functional characteristics after transmission through the signal line. The signal can respond with correct timing and voltage in the circuit. It can be known from the timing of the IC if the signal is in steady state time (in order to correctly identify and process the data, The IC requires a large transition within the time period during which the input data remains unchanged before and after the clock edge, and the IC may misjudge or lose part of the data. If the signal has good signal integrity, the circuit has the correct timing relationship and signal amplitude, and the data will not be captured by mistake, which means that the receiver can obtain relatively pure data. Conversely, if a signal integrity fault such as false triggering, damped oscillation, overshoot, undershoot occurs, any signal transition will occur, causing the input distortion data to be sent into the latch or captured on the distorted clock edge. Data, the signal can not respond properly, resulting in abnormal system operation and performance degradation.
Qualifications and main duties.
Abstract: This paper systematically analyzes the various forms of power supply noise interference in high-frequency PCB boards and their causes. Through formula derivation and engineering experience, several corresponding countermeasures are proposed. Finally, the suppression of power supply noise should be followed. The general principle.
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