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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 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.
Knowing the basic principles of the IBIS model, it is easy to perform signal integrity analysis on the designed circuit. Due to the high precision and transparency of the IBIS model, it was supported by major EDA vendors as soon as it was introduced. Now all kinds of EDA tools have the function of system simulation using IBIS model, and some of them integrate with PCB design tools. In the design process, the simulation of signals can be directly performed online, which is very convenient to use.
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 range of variations in characteristic impedance control must consider four factors:
The high-speed PCB layout technology driven by electrical rules realizes the design strategy of signal crosstalk control.
At present, there are many kinds of EMC simulation softwares in the world.
The via design consists of a pad and a pad area around the hole and an inner electrically isolated area. The parasitic inductance, parasitic capacitance, etc. of the vias affect the high-speed signals passing through the vias. The size of the vias and the pads connected to them have a direct effect on the properties of the vias.
1. First, have a reasonable direction:
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.
1. The corner of the transmission line should be at a 45° angle to reduce the return loss.
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.
Generalization of PCB design principles (1-30)
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