noise_book:decoupling_caps
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| noise_book:decoupling_caps [2026/06/10 20:24] – created admin | noise_book:decoupling_caps [2026/06/10 20:28] (current) – admin | ||
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| Whenever a chip operates, its current consumption changes rapidly. Even a short PCB trace has some resistance and inductance, which means the supply voltage at the chip can momentarily dip or fluctuate as the chip switches on and off internally. | Whenever a chip operates, its current consumption changes rapidly. Even a short PCB trace has some resistance and inductance, which means the supply voltage at the chip can momentarily dip or fluctuate as the chip switches on and off internally. | ||
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| Without proper decoupling, these small voltage fluctuations can become a source of noise and may affect the operation of the chip itself or nearby circuits. | Without proper decoupling, these small voltage fluctuations can become a source of noise and may affect the operation of the chip itself or nearby circuits. | ||
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| The connection between the capacitor and the chip should be short and direct. Long traces reduce the effectiveness of the capacitor and allow more noise to develop. | The connection between the capacitor and the chip should be short and direct. Long traces reduce the effectiveness of the capacitor and allow more noise to develop. | ||
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| If there is only one PCB noise-reduction technique you remember from this book, make it this one: place a decoupling capacitor next to every IC power pin. | If there is only one PCB noise-reduction technique you remember from this book, make it this one: place a decoupling capacitor next to every IC power pin. | ||
noise_book/decoupling_caps.1781123045.txt.gz · Last modified: by admin