PCB Technical - Related PCB Technology Blog Posts page 217

2020-09-11

1. The corner of the transmission line should be 45° to reduce the return loss. 2. Use high-performance insulated PCB b...

2020-09-11

The transmission rate of high-speed PCB design and wiring systems is steadily accelerating, but it also brings a certain anti-interference vulnerability. This is because the higher the frequency of transmission of information, the increase in signal sensitivity, and their energy is getting weaker and weaker. At this time, the wiring system is more susceptible to interference.

2020-09-10

Some Basic Rules of PCB Layout, And PCB Layout need to pay attention to the rules.

2020-09-10

The inner layer processing of printed circuit board can be divided into four steps: pretreatment, dust-free room, etching line and automatic optical inspection.

2020-09-08

the line width of 1--2.54MM (40-100MIL) can meet the general application requirements. The ground line and power supply on the high-power equipment board can be appropriately increased according to the power level. On the circuit, in order to improve the wiring density, the minimum line width is 0.254--1.27MM (10--15MIL) to meet. (Manual welding: 20-30MIL power line and ground line should be wider)

2020-09-02

The circuit connection of multi-layer board is through buried hole and blind hole technology. The main board and display card mostly use 4-layer PCB, and some use 6-layer, 8-layer or even 10-layer PCB.

2020-09-02

Electromagnetic field theory is often used to analyze the high frequency application problems with distribution characteristics in engineering. Generally, in the measurement of chip inductor by impedance analyzer (hp-4291b), the measurement accuracy can be improved to about 0.1nh by means of fixture compensation and instrument calibration, which is sufficient to ensure the accuracy requirements of circuit design in theory.

2020-09-02

The distance between the large area copper foil and the outer frame should be at least 0.2mm or more. If V groove is required, it should be as much as 0.4mm or more. Otherwise, when milling the shape of the copper foil, it will easily cause the copper foil to warp and cause solder resist shedding problem.

2020-09-12

It is specially pointed out in IPC standard that the allowable deformation of PCB board with SMD is 0.75%, and that of PCB board without SMD is 1.5%. In fact, in order to meet the needs of high-speed and high-speed mounting, some electronic assembly manufacturers have more stringent requirements on deformation.

2020-09-01

PCB Anti-jamming Design Technology for High Speed DSP, high quality PCB circuit board with strong anti-jamming ability, stable performance and high real-time performance be designed.

2020-08-31

In order to prevent the occurrence of this situation, a shunt cathode pattern can be attached around the circuit. , Absorb the uneven current scattered on the electroplating pattern, and ensure the uniform thickness of the plating layer on all parts to the maximum limit. Therefore, it is necessary to work hard on the electrode structure. A compromise is proposed here.

2020-08-27

Impedance matching impedance matching is a suitable matching mode between signal source or transmission line and load. According to the access mode, the impedance matching can be divided into two modes: serial and parallel; according to the frequency impedance matching of signal source, it can be divided into low frequency and high frequency,,,

2020-08-27

Defects of pure tin plating on PCB, Solutions to common problems in pure tin plating process summarized

2020-08-26

5G has three requirements for PCB as well as the common circuit board structure.

2020-08-25

Every PCB sold in the PCB industry is customized by customers. Therefore, the quotation of the PCB board needs to be cost-calculated first. At the same time, it also needs to refer to the automatic layout calculation of the PCB computer, and the material utilization rate of the layout on the standard size copper clad laminate is determined. Comprehensive quotation. The cost calculation of the PCB industry is the most special and complex of all industries. From cutting, pressing, forming, to FQC, packaging, and finished storage, it needs to be based on the material costs, labor costs, and manufacturing costs invested in each process. Perform step-by-step accounting, and then accumulate costs in batches based on the order product number.

2020-08-21

Q 1 : In the design of small data signal circuits, the resistance of a short section of copper core wire must not be cri...

2020-08-19

It is precisely because of the continuous innovation of PCB products that we usher in the spring of pcb development. The edge of smart phones brings the climax of embedded component of pcb boards, LED energy-saving lighting will bring the climax of metal-based pcb boards, and e-books and film revealers will bring the climax of flexible circuit boards, that is, high-precision and high-frequency(HDI) PCB board.

2020-08-19

The RO3003 from Rogers Corporation is a Ceramic-filled PTFE based Laminate that can be used for RF & Microwave appli...

2020-08-18

If the frequency of the digital logic circuit reaches or exceeds 45MHZ~50MHZ, and the circuit operating above this frequency has taken up a certain share of the entire electronic system (for example, 1/3), it is usually called a high-frequency circuit.

2020-08-17

6 common types of flexible PCB, Single side board, Double sided board, Single plus single composite board, Relief board, Multilayer board, Rigid-flex board