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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.
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Since SMT generally uses infrared furnace heat flow welding to achieve component soldering, the layout of the components affects the quality of the solder joints, which in turn affects the yield of the product. For the design of RF circuit PCB, electromagnetic compatibility requires that each circuit module does not generate electromagnetic radiation as much as possible, and has certain anti-electromagnetic interference capability. Therefore, the layout of components directly affects the interference and anti-interference ability of the circuit itself. This is also directly related to the performance of the designed circuit.
PCB layout is the most important step in the design of electronic products. PCB layout and wiring will directly affect the performance of the circuit. Nowadays, although there are many softwares that can realize automatic PCB layout and routing, as signal frequencies continue to increase, engineers often need to understand the basic principles and techniques of PCB layout and routing to make their design perfect.
The so-called source synchronization means that the clock strobe signal CLK is transmitted by the driver chip along with the transmission data, and it does not use an independent clock source like the common clock synchronization. In the source synchronous data transceiving, the data is first sent to the receiving end, and the strobe clock is sent to the receiving end for sampling and latching the batch of data after a short time. The schematic diagram is shown in Figure 2. The timing analysis of source synchronization is simpler than the synchronization of common clocks. The analysis methods are very similar. The analysis formula is directly given below:
Suppression of Conductor Crosstalk on PCB Boards Routes are avoided when designing and cabling. As long as there are electronic components such as integrated circuits, which can be used for electrical interconnection between them, in order to suppress the crosstalk between the PCB circuit board wires, in designing the wiring to avoid the long distance of the equal alignment, so need to use pcb circuit board. In the research process of larger electronic products, the lowest level of success factors are the design, documentation, and manufacturing of printed boards. Its design and manufacturing quality directly affect the quality and cost of the entire product, and even lead to the success or failure of commercial competition.
PCB light painting process is a very important part of PCB in the circuit transfer process. Any errors that occur in this link may bring serious problems to the subsequent process, so each step inside must be strictly controlled.
The concepts of Layer, Via, Overlay, Pad, Mask, etc.,
Downstream operators usually require PCB manufacturers to do 100% electrical testing, so they will agree with PCB manufacturers on test conditions and test methods. Therefore, both parties will clearly define the following:
Each VXI bus device has a set of “configuration registers”. The system main controller reads some of the basic configuration information of the VXI bus device by reading the contents of these registers, such as device type, model, manufacturer, and address space (A16, A24). , A32) and the required storage space.
In high speed designs, the characteristic impedance of the controllable impedance plates and lines is one of the most important and common problems. First, let's look at the definition of a transmission line: a transmission line consists of two conductors of a certain length, one for transmitting signals and the other for receiving signals (remember that the "loop" replaces the concept of "ground"). In a multi-layer board, each line is part of a transmission line, and an adjacent reference plane can be used as a second line or loop. The key to a line becoming a "good performance" transmission line is to keep its characteristic impedance constant throughout the line.
Especially for beginners, it is necessary to master the testing methods and experience of common components.
The anti-jamming measures that are not common in some literatures are detailed below. Considering the practical application, especially in the trial production of products, double panels are still widely used. The following contents are mainly for double panels.
This is a big problem. We set aside other factors, just the PCB design aspects, share the following experience for reference exchange:
In high-speed PCB digital circuit systems, impedance mismatch on the transmission line will cause signal reflection and signal distortion such as overshoot, undershoot and ringing, and when the delay TD of the transmission line is greater than 20% of the signal rise time RT, the reflection The impact can't be ignored, or it will bring signal integrity problems. The method of reducing the reflection is: matching the source impedance with the transmission line impedance according to the characteristic impedance of the transmission line at the driving end thereof, or matching the load impedance with the transmission line impedance at the receiving end, so that the source reflection coefficient or the load reflection coefficient is zero.
As integrated circuit output switching speeds increase and PCB board density increases, signal integrity has become one of the issues that must be addressed in high-speed digital PCB design. Factors such as components and PCB boards, layout of components on the PCB, and wiring of high-speed signals can cause signal integrity problems, resulting in unstable system operation or even no work at all.
Flexible printed circuit boards can be classified according to the type of bending encountered during assembly and use. There are two design types, which are discussed below:
The PCB board is divided into many layers. What are the techniques for the high four-layer routing? Let me introduce you to the following.
As an electronic engineer, designing a circuit is a must-have hard work, and the principle design is perfect. If the board design is unreasonable, the performance will be greatly reduced, and even if it is serious, it will not work properly.
How to reduce the mutual interference between digital signals and analog signals?
To address signal integrity issues, the entire design process needs to be further upgraded to become a complete set of tools that can take into account multiple different effects and design assessments.
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