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How Ground Bounce Can Ruin Your Day

Low-speed printed circuit board (PCB) designs now have to deal with high-speed switching problems. This article examines the ground bounce generated from an LCD assembly while evaluating the impact of the ground bounce on the system level EMI. Three solution strategies to mitigate the ground bounce are analyzed, the pros and cons of each strategy are provided along with the test results.


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A Brave New World: Simulating DDR5

Eagerly anticipated, the next generation of DRAM technologies (DDR5/LPDDR5) are presently being validated in the lab by leading silicon vendors worldwide. This latest generation has a big surprise in store for hardware engineers and SI specialists that need to simulate such systems. DDR5 will introduce decision feedback equalization (DFE) for the DRAM receiver for the very first time.


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Return Current Transition Between Planes

Return current for a signal always finds a way to flow as close to the signal as possible, thus minimizing the magnetic energy stored in the loop defined by the signal and its return path. So, the return current path is the combination of conduction paths that together minimize the stored magnetic energy. Some elements of the return current path may be part of the design and other elements may be unintentional.


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