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（1）Policy liberalization On December 7, the State Council issued the Notice on Further Optimizing the Implementation of the Prevention and Control Measures for the COVID-19 (commonly known as the "...

①F=1/(Tr*π) F is the frequency (GHz); Tr(nanosecond) refers to the rise time and fall time of the signal.Usually when F > 100 GHz, it can be called high frequency circuit. ②The high frequency circu...

①The frequency of digital logic circuit reaches or exceeds 45MHZ~50MHZ, and the circuit working on this frequency has taken up a certain part of the whole electronic system (for example, 1/3), it i...

High-layer ①Maximum 80 layers, maximum plate thickness 6.35MM, minimum drill bit 0.25MM, maximum hole diameter ratio 25.4:1 ②multi-stage back drilling ③Surface Treatment： OSP, LF HASL (Sn-Ag-Cu/Sn-...

There are several reasons for the general copper adding: 1.EMC can shield large areas of ground or power supply copper, and some special areas, such as PGND, can play a protective role. 2.PCB proce...

The selection of inductance value shall consider not only the noise frequency to be filtered, but also the reaction ability of instantaneous current. If the output terminal of LC has the opportunit...

As far as digital circuits are concerned, three things should be determined in sequence at first. ①Make sure that all power values meet the design requirements. Some systems with multiple power sup...

During the 2023 Chinese New Year, the office will work all day except January 21 to 23 (three days). ※ Reference: The Spring Festival in 2023 in China will be closed from January 21 to 27 (7 to 14 ...

The hole connecting any circuit layer inside the PCB but not conducting to the outer layer is called buried hole. This process can not be accomplished by pressing and then drilling. It must be perf...

The board's outermost circuit is connected to the adjacent inner layer by a plating hole, which is called a"Blind through" because the opposite side can not be seen.

​Through hole is also called Plating Through Hole. PTH is abbreviation of Plating Through Hole.

Via hole is an important part of PCB circuit board. Simply put, every hole in the PCB can be called a via hole.