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Qualcomm Interim Engineering Intern Interview Question

I interviewed in San Diego, CA and was asked:
"Discuss why it is best to use different values of decoupling capacitors in a power distribution network instead of a single capacitor."
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Part of a Interim Engineering Intern Interview Review - one of 988 Qualcomm Interview Reviews

Answers & Comments

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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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