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2020-10-04
Why should PCB characteristic impedance be controlled, PCB characteristic impedance control and PCB process control.
According to the principle of electromagnetic wave, the shorter the wavelength (λ), the higher the frequency (f). The product of the two is the speed of light. That is, C = λ. F = 3 × 1010 cm / s
2020-09-30
In general, there are some factors in the selection of antenna. In addition to considering the performance, but also considering the cost, when choosing the antenna, we need to consider comprehensively. Today, ipcb will tell you about various antenna PCB design and design points.
2020-09-29
PCB products are in the downstream, and the terminal industries are aerospace, automobile, household appliances, communication, computer, etc.
Choose the materials of the high frequency circuit board
PCB layout， high frequency circuit board design and layout
Therefore, ipcb put the trial and use of halogen-free PCB on the agenda, worked out a detailed plan, and gradually expanded the share of halogen-free PCB in ipcb, so that ipcb was ahead of the market demand.
At present, there are many fr-4 materials used on ordinary circuit boards, but most of them are made of tera-function epoxy resin, fillers and glass fiber composite materials with high temperature resistance.
In space applications, microwave devices and antennas are exposed to nuclear radiation, so the radiation resistance of PTFE materials used in this scene is very important.
2020-09-27
When analyzing the circuit, you can understand the actual working principle of the circuit by identifying the symbols of the various circuit components drawn in the diagram and the connections between them. The schematic diagram is a tool that reflects the working of electronic circuits.
Electromagnetic compatibility refers to the ability of electronic equipment to work harmoniously and effectively in various electromagnetic environments.
2020-09-26
Impedance PCB refers to the PCB that needs impedance control. PCB impedance control means that under a high frequency signal, the "resistance" generated by a certain line layer to its reference layer in the transmission must be controlled within the rated range, so as to ensure that the signal will not be distorted in the transmission process.
In the high-speed PCB design process, PCB stack design and PCB impedance calculation are the first steps. PCB impedance calculation method is very mature, so the difference between different PCB software calculation is very small. This ipcber uses si9000 as an example.
The so-called PCB copper coating is to take the idle space on the PCB as the reference plane, and then fill the PCB with solid copper. These copper areas are also called copper filling.
Design skills of high frequency circuit board 1. Improve the PCB design specification for high precision etching. Consider specifying a total line width error of + / - 0.0007 inches, managing undercut and cross sections of wiring shapes, and specifying plating conditions for wiring side walls. The overall management of wiring (conductor) geometry and coating surface is important to solve the skin effect problem related to microwave frequency and realize these specifications.
2020-09-25
Considering PCB design, 50 ohm PCB is also the choice after comprehensive consideration. In terms of the performance of PCB routing, it is better to have low impedance.
PCBA is a kind of printed circuit board with various components soldered on its surface. Many people pay attention to its reliability of long-term and high-frequency operation, and need to know its storage life. Generally, the shelf life of PCBA is 2-10 years, which is mainly affected by the following factors:
Any trace on PCB will cause time delay to the signal when passing through high frequency signal.
The process of surface adhesion assembly, especially for small spacing components, needs continuous monitoring and systematic inspection. For example, in the United States, the solder joint quality standard is based on ipc-a-620 and national solder standard ANSI / j-std-001.
1.1as receivedThe products submitted for acceptance have not been subjected to any condition treatment, and they are in ...
