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Interview Question

Interim Engineering Intern Interview San Diego, CA

Discuss why it is best to use different values of

  decoupling capacitors in a power distribution network instead of a single capacitor.
Answer

Interview Answer

1 Answer

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The loop inductance from a capacitor depends on its geometry, so by using different capacitor values it is possible to tune the self-resonant frequencies of the capacitor. By doing so, you can ensure the PDN is low impedence across a broad range of frequencies.

Interview Candidate on Aug 15, 2009

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