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Research on Design Methods for FPC_1_Design Concept
1. Design Concept of Flexible Boards
The design of flexible boards consists of three parts: device selection, structural design, and electrical circuit design. If we compare a flexible board to a person, device selection is like the hands, feet, and eyes, serving as the interface between the flexible printed board and the external world, allowing it to interact with the outside environment; structural design is like the torso, providing strong support for the flexible printed board; and electrical circuit design is like the brain, embodying the soul of the flexible printed board. Although they have clear priorities, none of them can be dispensed with. They need to complement each other to complete the final flexible printed circuit board design, meeting requirements such as high speed, radio frequency assembly, and electrical performance.
1.1 Component Selection Requirements for Flexible Boards
As the gateway of flexible printed boards to the outside world, the component selection for flexible printed boards should meet the basic requirements for mating and docking with user system equipment. During the selection process, considerations should be given to the size, structure, and locking requirements of components from the perspectives of assembly, mating, locking, soldering, and routing, based on the locking method, mounting method, orientation, and limited structural space of the mating components on the user's system equipment.
1.2 Structural Design Requirements for Flexible Boards
The structural design of flexible printed circuit boards determines the space for electrical circuit design and also whether the physical structure of the product can meet the mechanical environmental requirements. As a solid foundation for flexible printed boards, the design process should consider requirements such as bending radius, fixing position, and non- routable space, and fully consider the physical reliability of flexible printed boards in the structural design process, taking into account the mechanical environmental requirements of the product application.
1.3 Electrical Circuit Design Requirements for Flexible Boards
The electrical circuit design of flexible printed circuit boards can be likened to the blood or soul of flexible printed circuit boards, and is the top priority in their design.
The basis for electrical circuit design of flexible printed circuit boards comes from the wiring relationship table and OJ 3103 - 99 "Printed Circuit Board Design Specification". Before starting the electrical circuit design, it is necessary to analyze the product's wiring relationships clearly, identifying which signals are present in the product's wiring table, whether they are digital or analog signals, differential signals, or power signals, etc., and understanding the requirements for each type of signal. Only by clarifying the characteristics of various signals can the true electrical performance requirements of the product be met.
