Solution to CPU instability caused by improper PCB layout

In the high-speed digital circuit, the power consumption of CPU often increases with the increase of the main frequency. If the PCB layout is improper, it may cause the CPU to work unstable, which I have encountered before. When the Marvell 88f6282 CPU is running at 2GHz, the memory test shows that the CPU often […]

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Operation process of replacing pad in Allegro

Recently, I learned that many readers are not clear about the operation of replacing pads in allegro. Wireless era hereby invites partners to write a detailed operation process for readers. The full text is as follows: Some functions in Allegro PCB will produce magical effect when used in certain situations, but some people are not […]

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Methods and steps of importing outline in Allegro

In the process of PCB design, EDA engineers often need to match the structure of two generations of PCB. In this case, importing the outline of the previous generation of PCB into the new PCB design file can greatly shorten the time, and the size is completely accurate. I see that there are often netizens […]

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Out of date shapes problem in Allegro PCB design

When using Allegro to design PCB, you often encounter the warning message of out of date shapes when viewing the status. The details are as follows: dynamic shape is still out of data or empty.Run out of date shapes Report from status dialog to identify them. This problem is due to the copper when there […]

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3W line spacing principle for crosstalk suppression in PCB layout

Crosstalk refers to the interference between signal lines due to mutual capacitance (the air medium between signal lines is equivalent to capacitive load) and mutual inductance (mutual coupling of electromagnetic fields of high-frequency signals). Due to the existence of this coupling, when some signal levels change, voltage (noise) will be induced on nearby signal lines. […]

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General equal length rule setting method of Allegro

In today’s high-speed PCB design, the equal length of a group of wires is more and more important. Allegro provides engineers with a powerful constraint manager, namely constraint manager. Engineers can easily set various rules, including equal length rules. In the article “DDR routing rules and process” published earlier in the wireless era, a method […]

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Causes of PCB quality problems

Lead tin plate is needed in many products, especially the PCB multilayer board with many varieties and few quantity. If the hot air leveling process is adopted, the manufacturing cost will be increased, the processing cycle will be long, and the construction will be very troublesome. For this reason, lead and tin plates are usually […]

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Two types of PCB routing strategies

Different types of single board, its routing strategy is naturally not the same, this paper mainly introduces two types of PCB routing strategy. Type I PCB routing strategy 1) The main characteristics of type 1 are as follows: strict length rule, strict crosstalk rule, topology rule, differential rule, power ground rule, etc. 2) Key network […]

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Three steps to design PCB

There are candence, PROTEL DXP, Altium designer and other softwares to design circuit diagram, but the most practical one is ad software, which is simple and easy to use. Using ad to design PCB can be divided into three steps 1. Schematic drawing Common component schematic library will bring with it, but some special components […]

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