Category Archives: Uncategorized

This is one of the qualitative design rules of RF analog PCB and one of the EMC design rules of high-speed PCB. Qualitative but not quantitative, I have no idea. Make a quantitative conclusion with HFSS today. Some junior engineers violate this rule, which leads to the deterioration of the whole board index. It is […]

1. Ground wire layout: 1. Digital ground is separated from analog ground. 2. The grounding wire should be as thick as possible, so that it can pass at least 3 times the allowable current on the printed circuit board, generally 2~3mm. 3. The ground wire should constitute an infinite loop as far as possible, so […]

Should the isolated copper be removed in PCB design? PCB design skills need to pay attention to many problems, the compatibility of various devices, and the finished products are all important factors to be considered. Today’s topic is whether to remove isolated copper in PCB design? Some people say it should be removed, probably because: […]

The package of parts can be specified when designing the circuit diagram or when introducing the network list. When designing the circuit diagram, you can specify it in the Footprint setting item in the part properties dialog box, or you can specify the part package when importing the netlist. Question 1: What is part packaging […]

In the ordinary PCB design, we will encounter various problems of safe spacing, such as the spacing between vias and pads, the spacing between traces, and so on, which should be considered. So today, we will divide these spacing requirements into two categories, one is: electrical safety spacing; The other type is: non-electrical safety distance. […]

Characteristic impedance of PCB: also known as “characteristic impedance”, it is not a DC resistance, and belongs to the concept of long-line transmission. In the high frequency range, in the process of signal transmission, an instantaneous current will be generated between the signal line and the reference plane (power supply or ground plane) due to […]

Nowadays, with the rapid update of electronic products, the printing of PCB has expanded from single-layer board to double-layer board and multi-layer board with more complicated requirements for high precision. Therefore, there are more and more processing requirements for PCB holes, for example, the hole diameter is getting smaller and smaller, and the distance between […]

High-precision PCB refers to the adoption of technologies such as fine line width/spacing, tiny holes, narrow ring width (or no ring width) and buried and blind holes to achieve high density. And high precision means that the result of “thin, small, narrow and thin” will inevitably bring high precision requirements. Take the line width as […]

With the progress of society and the development of science and technology, new electronic products are constantly emerging, which makes the application field and market of printed circuit board (PCB) products constantly expanding, and at the same time, the demand for electronic information processing of all kinds of products is gradually increasing. When the demand […]

In PCB circuit design, there will be times when IC needs to be replaced. Here’s to share the skills of IC replacement, so as to help designers to be more perfect in PCB circuit design. Direct substitution Direct replacement refers to the direct replacement of the original IC with other IC without any change, which […]