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support@nextpcb.comHere you'll find insights into PCB design, tech trends, assembly issues, and trending topics
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.
Common impedance interference is caused by a large number of ground lines on the PCB. When two or more loops share a ground line, different loop currents generate a certain voltage drop on the common ground. This voltage drop will affect the circuit performance when amplified. When the current frequency is high, it will be very The large inductive reacts to the circuit.
1-4 Measures taken to increase the system's ability of it.
(1) Cross circuit is not allowed in the printed circuit. For the lines that may cross, it can be solved by “drilling” or “winding”. That is, let a certain lead be "drilled" from the gap under other resistors, capacitors, and triodes, or "wrap" from one end of a lead that may cross. How to make the circuit complicated in special cases, to simplify the design It is allowed to bridge the wires to solve the cross circuit problem.
In order to perform circuit simulation, it is necessary to first build a model of the component, that is, for the various components supported by the circuit simulation program, there must be a corresponding mathematical model to describe them in the simulation program, that is, a calculation formula that can be calculated by a computer. To express them.
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.
High-speed circuit design is a very complex design process. There are several factors that need to be considered when designing a high speed circuit. These factors are sometimes opposite each other. Such as the high-speed device layout when the position is close, although the delay can be reduced, but crosstalk and significant thermal effects may occur. Therefore, in the design, we must weigh the various factors and make a comprehensive compromise; not only meet the design requirements, but also reduce the design complexity. The adoption of high-speed PCB design means the controllability of the design process. Only controllable is reliable.
The concepts of Layer, Via, Overlay, Pad, Mask, etc.,
25. Sensitive circuits or devices (such as reset circuits, WATCHDOG circuits, etc.) are at least 1000 mils away from the edge of the board, especially the interface edge of the board.
Start the PCB Editor → Determine Board Size → Load Package Components Library → Load Network Table 9 Component Layout, Routing → Auto/Manual Routing → View 3D View.
First, the appearance should not only consider the neat and orderly placement of components, but also consider the beautiful and smooth lines.
In high-speed circuit design, the traditional approach to locating signal integrity problems is to use hardware triggers to isolate events and/or to capture events using deep acquisition storage techniques before looking for problems. As the speed and complexity of high-performance circuit systems continue to increase, the limitations of using oscilloscopes to locate signal integrity problems are becoming more prominent.
Six points
Impedance PCB final test eligibility criteria
The following layered stacking scheme assumes that the supply current flows on a single layer, with single or multiple voltages distributed across different parts of the same layer. The case of multiple power planes is discussed later.
The frequency measurement is generally performed by a scanning spectrum analyzer, which scans the amplitude of each frequency signal and stores it under a certain resolution bandwidth (RBW), thereby displaying the information of the amplitude as a function of the entire frequency band. The RBW is an important consideration for scanning spectrum analyzers to provide excellent dynamic range and high accuracy of the static spectral components of the signal. However, the main disadvantage of a scanning spectrum analyzer is that it tests the amplitude of a frequency point of the signal only at one point in time.
Printed circuit boards (PCBs) appear in almost every electronic device. If there are electronic parts in a certain device, they are also mounted on different sizes of PCB.
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.
Common PCB circuit diagrams include four major types: schematics, block diagrams, assembly drawings, and printed board drawings.
Whether the wiring of a printed board can be completed smoothly depends mainly on the layout, and the higher the density of the wiring, the more important the layout. Almost every designer has encountered such a situation. When there are only a few wires left, they find that they can't be laid out anyway. They have to delete a lot or all of the wiring and re-adjust the layout! A reasonable layout is guaranteed. The premise of wiring.
To master several methods of analyzing common circuits, familiarize yourself with the circuit types and analysis steps that are appropriate for each method.
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