RF PCB design is often described as a kind of “black art” because there are many uncertainties in theory. However, this view is only partially correct. There are many rules that can be followed and rules that should not be ignored in RF PCB design. The following is a summary of the conditions that must…
SLP is short for substrate-like PCB. It is the next generation of rigid pcb board, which can shorten the line width / line spacing from 40 / 50 μ m of HDI to 20 / 35 μ m, that is to say, the minimum line width / line spacing will be shortened from 40 μ…
If you are just starting to study the design of IOT products, there are many design aspects that need to be improved. IOT devices integrate mobility, low power consumption, RF communication, mixed signal functions and high-speed data transmission functions into a small space. Keeping all these factors in mind will help you design correctly in…
The rapid development of electronic industry promotes the rapid development of many industries. In recent years, electronic products are more and more widely used in automobile industry. The traditional automotive industry has made more efforts in mechanics, power, hydraulics and transmission. However, the modern automotive industry relies more on electronic applications which play an increasingly…
As a hardware engineer, project director and small boss, are you still worried about PCB layout? PCB layout is difficult to say, easy to say, and not easy to say. In addition to the EE engineer’s schematic diagram, layout is also very important for product quality. Wiring rationality, impedance matching, machinability, EMI, EMC considerations, test…
HDI PCB is a printed circuit board designed to maximize the density of surface components, provide breakthrough solutions and / or transmit high-frequency signals for ICs with a large number of closely spaced pins or pads. The aim is to provide greater functionality in smaller packages. To achieve this goal, you need to select a…
The progress of printed circuit board technology is promoting the development of electronic industry. Whether it's providing solutions that are changing our homes and workplaces, or offering smaller products that increase ease of use, have a profound impact. Although the macro trend of electronic industry has been driven by the development of Internet of…
The first step is to determine the topology (only useful for multiple DDR chips) In a word, DDR1 / 2 adopts star structure, DDR3 adopts chrysanthemum chain structure. The extension structure only affects the routing mode of address line, but does not affect the data line. Star expansion means that the address line goes to…
The first function is to cut off the direct current The so-called isolated DC is actually the function of high pass filter. High pass means that high-frequency signals can pass through, while low-frequency signals are difficult to pass, and direct current can not pass through completely, The second function: reactive power compensation …
What is the function and principle of grounding via hole near the wiring via hole? According to their functions, the through holes of PCB board can be divided into the following categories: 1. Signal vias (via structure requirements have the least impact on signals); 2. Power and ground vias (via structure requires…
FPC cable, also known as flexible PCB. It is used for data transmission of moving parts and active areas according to the industry specifications. The arrangement is mainly divided into two types: round ends (R-FFC for direct welding) and flat ends (FFC for plug-in socket). Characteristics of cable arrangement 1. The cable layout is small…
The schematic diagram only indicates the electrical connection relationship between components, and does not represent the actual connection. Therefore, we need to layout these connection relationships in the actual PCB board. That is to say, when drawing the schematic diagram, you do not have to consider the layout, wiring, EMC and other various issues, as…
About Stencils: Stencils (SMT stencil): it is a special SMT mold; its main function is to help solder paste deposition; the purpose is to transfer accurate amount of solder paste to the exact position on PCB. Stencils classification According to the manufacturing process of SMT stencil, it can be divided into laser stencil, electropolishing stencil,…
PWM concept: PWM is the abbreviation of "pulse width modulation". It is a very effective technology to control analog circuit by digital output of microprocessor. It is widely used in many fields from measurement, communication to power control and transformation. Most of the control signals in the model aircraft are PWM signals, such as…
Several key points of PCB design in the later stage are as follows When a PCB has completed the layout and wiring, and the connectivity and spacing are checked and no error is reported, is a PCB completed? The answer is no, of course. Many beginners, including some experienced engineers, tend to rush through…
What is FPC FPC stands for Flexible PCB. It is a type of printed circuit board (PCB) that is designed to be flexible and can conform to various shapes and contours. FPCs are also known as flexible PCBs or flex circuits. They are used in a wide range of electronic devices and applications where traditional…
