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…
On the making standard of stamp hole 1. Stamp holes: it is suggested that 5 to 8 holes with a diameter of 0.60mm should be arranged in one row (double rows) as a group. 2. The distance between the double row pcbs should be at least 1.2 mm (1.6 or 2.0 mm in…
Many high-performance automotive auxiliary systems rely on radar to collect information around the vehicle. They are used to accurately calculate the distance and relative speed between the vehicle and the vehicle in front according to the principle of reflected wave. Bosch’s fourth generation long range radar sensor (lrr4) is designed on the basis of R…
TWS is the abbreviation of true wireless stereo, which means real wireless stereo. TWS technology is also based on the development of Bluetooth chip technology. According to its working principle, it means that the mobile phone connects the main headset, and then the main headset quickly connects the secondary headset through wireless way, so as…
The price of flexible PCBs (Printed Circuit Boards) can vary significantly based on a variety of factors. When determining the cost of flexible PCBs, consider the following key factors that can influence the pricing: Complexity of Design: The complexity of the PCB design, including the number of layers, the density of components, and the intricacy…
PCB, the so-called printed circuit board, is usually called rigid board. It is the support body of electronic components, which is a very important electronic component. PCB generally uses FR4 as base material, also known as rigid board, which cannot be bent or flexed. PCB is generally used in some places where there…
1. What kinds of ceramic PCB do you make now? We can do metal wiring on alumina, aluminum nitride, zirconia, glass, quartz. 2. How do you get through the vias? Our ceramic circuit board is connected when the ceramic substrate and copper foil are combined. Our products are drilled first and conducted with copper. Moreover,…
Ceramic substrate refers to the special PCB substrate with copper foil directly laminated on the surface of alumina (Al2O3) or aluminum nitride (AlN) ceramic substrate (single or double sided) at high temperature. Ceramic substrate has become the basic material of high power electronic circuit structure technology and interconnection technology. It is widely used in the…
