![]() The tradeoff here is that to control the impedance of a signal path and maintain good signal integrity, most designers route high-speed signals over solid copper ground planes. This type of board is called a “dynamic flex.” Of course, high-speed signal integrity cannot be ignored when designing a dynamic flex board, but PCB reliability should come first in this type of application. If the answer is “yes,” select materials that provide the best product reliability and longevity. The first question to ask is whether the rigid-flex board must bend and fold in daily use. This will largely determine whether the emphasis will be on signal integrity or the long-lasting flexibility of the circuitry. To be successful when designing a complicated rigid-flex PCB with high-speed signals, follow a specific set of best practices.īefore beginning the design process understand the intended application of the board and how the rigid and flexible sections will be used. PCB design is all about managing tradeoffs in the planning and layout stages, and a hybrid high-speed and rigid-flex design requires care when making these tradeoffs. For example, how do you determine what’s more important: high-speed signal integrity or the flexibility of the circuits? A guide to understanding the base material and copper options.ĭeveloping a rigid-flex printed circuit board is difficult enough, but when that PCB has high-speed signals as well the design can get complicated.
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