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in the general news media as they relate to printed circuit board technology.
As experts in the manufacture and assembly of printed circuit boards, we work to make our blog a helpful resource on PCB topics and the industries that we work with, including automotive, consumer electronics, aerospace and many more.
The process is as shown below: (PCB/LCD design)-->(CAM system)-->(Gerber file)
1. The information received is completed (including: schematics, *.brd, bill of materials, PCB design and change requirements, standardization requirements, process design documents)
At first glance, the PCB is similar in appearance regardless of its inherent quality. It is through the surface that we see the differences that are critical to the durability and functionality of the PCB throughout its lifetime.
Based on the transmission line model, in summary, the transmission line will have the following effects on the overall circuit design.
The basic principle of CB cascading design: For PCB manufacturers, PCB cascading solutions need to consider many factors.
When you get a product, many times there is no circuit diagram. In this case how to tell the principle of circuit boards and work it?
To do a good design, as the designer's first thing to do is to have a general overall layout, in order to make a specific design. The same pcb design is also the case, want to make the pcb board to achieve what they want, the overall layout, the placement of components is the primary consideration, they play a key role in the design of pcb board, they directly affect the entire printed circuit Board installation, reliability, ventilation, heat dissipation, wiring through rate.
This article describes various techniques for three types of interconnect design, including device mounting methods, wiring isolation, and measures to reduce lead inductance.
The direct cause of the temperature rise of the printed board is due to the existence of circuit power consumption devices. The electronic devices have different degrees of power consumption, and the heat generation intensity varies with the power consumption.
For the impact of the transmission line problem, we will talk about the ways to control these effects from the following aspects.
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.
The DFT team should be aware of the existing testing strategy. As OEMs turn to relying on more and more CMs, the equipment used varies from plant to plant. Without a clear understanding of the manufacturer's process, too many or too few tests may be used. Existing test methods include:
Today's computer system DDR3 memory technology has been widely used, and the data transmission rate has been repeatedly improved, and has now reached 1866Mbps. Under such high-speed bus conditions, to ensure the reliability of data transmission quality and meet the timing requirements of parallel buses, it poses great challenges to design implementation.
The high-speed PCB layout technology driven by electrical rules realizes the design strategy of signal crosstalk control.
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.
There are two ways to route: automatic routing and interactive wiring.
Printed circuit board design is another important part of Protel 98. In this process, you can use the powerful functions provided by protel98/protel99se to realize the layout design of the board and complete the difficult wiring work.
I remember just to work the first half, my main job is to draw the pin board.
In design, layout is an important part. The quality of the layout results will directly affect the effect of the wiring, so it can be considered that a reasonable layout is the first step in the success of PCB design.
Although Protel99SE has the function of automatic layout, it can not fully meet the working needs of high-frequency circuits. It is often necessary to rely on the designer's experience. According to the specific situation, the manual layout method is used to optimize the position of some components, and then combined with automatic layout. Complete the overall design of the PCB. The rationality of the layout directly affects the life, stability, EMC (electromagnetic compatibility) of the product, etc., must be from the overall layout of the circuit board, the feasibility of wiring and the manufacturability of the PCB, mechanical structure, heat dissipation, EMI (electromagnetic Comprehensive considerations such as interference), reliability, and signal integrity.
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