Anti-static scheme for circuit board design
Anti-static is a necessary part in the design of circuit boards. Static electricity can cause various damages to precision semiconductor chips, such as penetrating insulation layers; melting circuits and other hazards. In order to eliminate the harm of static electricity to the circuit board, some measures need to be taken to prevent static electricity.
In the design of the board, the antistatic design of the board can be achieved through layering, proper placement and routing. In the design process, most of the design modifications can be limited to increasing or decreasing components through prediction. Static electricity is well protected by adjusting the board layout.
In addition, as many layers of PCB as possible, the ground plane and power plane, as well as the closely spaced signal line-ground spacing, can reduce the common mode impedance and inductive coupling to achieve a double-sided PCB. /10 to 1/100. Try to keep each signal layer close to a power or ground plane. For high-density PCBs with components on the top and bottom surfaces, short traces, and many fill locations, consider using inner traces.
The anti-static work produced by the board can be done from the design of the board and beyond the design, for example, the staff is designing the board's dressing, working methods, and the entire board production environment.
The biggest source of static electricity is the friction of the human body. Therefore, handling the static electricity of the human body can greatly reduce the generation of static electricity. The static electricity of the human body can be handled from various aspects. For example, anti-static clothing, shoes, wrist straps and other personal anti-static products can be very good. Handle static electricity of the human body; second, electrostatic protection equipment for the entire production environment, such as anti-static ion fan, anti-static floor, air shower room, etc.
Finally, it is packaging and transportation. As the saying goes, there must be a sparseness in Baimi. In production, we strictly enforce anti-static specifications in the design and production activities of the circuit board. However, the product is completely out of shape and finally received in transportation. The attack of static electricity is really worth the loss. Here, I will introduce you to several anti-static packaging and transportation tools. It is an anti-static turnover tool displayed in Ant Fangjing Mall. The anti-static sponge tape inside the anti-static box can reduce the circuit. The board is shaken during transportation.
Circuit boards are very expensive and "squeezing" items, so the static protection specifications must be strictly enforced in production or transportation to ensure product stability.