But for complex and/or very high-speed designs, more assurance is needed. For lower-speed or less complex designs, this may still be adequate. Then a physical prototype is used to verify function and EMI compatibility. The traditional method was to carefully follow established design rules and, through visual inspection, determine that the board adheres to those rules and is likely to function and pass EMI. There are two basic methods to ensure designs will function as intended and also meet EMI radiation requirements. The ever-increasing clock speeds and edge rates have turned digital switching circuits into some rather good RF generators whichis not a good thing, of course! Other problems begin to manifest at higher speed as well: signal integrity problems due to impedance variations power integrity problems that can cause switching failures or overheating. ![]() ![]() High speed design has brought a set of design challenges that do not exist in lower speed designs, or exist at levels that don’t cause problems.
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