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| T3sl4co1l:
2.2uH resonates with 2.3uF at 70kHz, with a resonant impedance of ~1 ohm. With capacitors of ESR < 50mohm and similar for the inductor, you'll have a Q factor around 8, and a peak supply impedance around ~8 ohms. If the noise is at 70kHz, it won't be particularly good, compared to, say, using a tantalum or electrolytic of 2.2uF and ~1 ohm ESR. This is only a direct application of the relations provided above, in the hope that an example will further inspire the reader to apply them. 50mA is low enough that you might use a ferrite bead without worrying about saturation; a 100-680 ohm (at 100MHz) part in 1206 or larger size should do fine. This will have a lower Q than the inductor proper, but it will still be better with the lossy cap. Tim |
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