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The PCB industry has developed for such a long time, and now there are some new changes in PCB design. One is more miniaturization, which is mainly driven by the portability requirements of smart devices; the other is the transformation of PCBs from traditional rigid boards to rigid-flex boards. And when the PCB is moving towards the high-end, there are two main aspects, one is that the data carrying and transmission rate are getting higher and higher, and the other is that for smart home and wearable devices, the demand for HDI is becoming more and more obvious.Users requirements for PCBs are also getting higher and higher. Experts say that higher speed, smaller size and faster time to market are both challenges and opportunities for PCB design. For customers, on the premise of meeting performance indicators, it is better to have a faster design delivery time.

Microstrain: It is a dimensionless physical quantity. When a PCBA is subjected to external force, a deformation will occur in the PCBA. The tensile strain becomes positive, and the compression shortens strain is negative. The general limit in the industry is 500μe. Principal strain: The maximum and minimum orthogonal strains in a plane, and the shear strain in the direction perpendicular to each other is "0".Strain rate: is used to describe the degree of how fast the strain changes. The amount of change in strain divided by the time interval over which this change was measured. The strain rate is also used to measure the risk of component rupture, and is mostly used to measure the rupture risk of BGA tin points. For MLCC, strain is mainly used to measure the rupture risk of components. If the strain rate is generally not required by customers, the limit value is generally 100000μe/s.By quantifying the strain at the position of the MLCC in the process through the strain test, it is very...

The inductive sensor is a device that uses the law of electromagnetic induction to realize non-electrical measurement through the change of the self-inductance and mutual inductance of the coil. It is characterized by the use of the physical characteristics of the inductance, which can measure displacement, vibration, pressure, flow and other signals without direct contact with the measured object.1. Classification of inductive sensorsInductive sensors are divided into three types: self-inductance, mutual inductance and eddy current according to their working principles.1. Self-inductive sensor: A self-inductive inductive sensor is a sensor that changes the self-inductance coefficient. It consists of coil, iron core and armature. Between the iron core and the armature, there is an air gap δ and an air gap magnetic permeability cross-sectional area S0, which are two parameters that are easy to change.The total reluctance of the magnetic circuit of the self-inductive sensor can be expres...

In design, layout is an important part. The quality of the layout result will directly affect the effect of the wiring, so it can be considered that a reasonable layout is the first step to a successful PCB design.There are two layout methods, one is interactive layout and the other is automatic layout.Generally, it is adjusted by interactive layout on the basis of automatic layout. During layout, the gate circuit can also be redistributed according to the wiring situation, and the two gate circuits can be exchanged to make it the best layout for easy wiring.After the layout is completed, the design files and related information can also be returned and marked on the schematic diagram, so that the relevant information in the PCB board is consistent with the schematic diagram, so that the future filing and design changes can be synchronized. The information is updated to enable board-level verification of the electrical performance and functionality of the circuit.Common rules for wirin...