# Decoupling with multiple caps per pin. Which should be closest?

I have an Ultra Wide Band transceiver with an internal power amp. This PA has two input pins for Vdd.

According to the manufacturer, each of these pins should be decoupled with three caps; 10p, 330p, and 0.1u.

I'm using 0402 packages for all of the caps. In which order should I physically place them, relative to the IC? In other words, should the placement be

0.1u -> 330p -> 10p -> IC

or should it be

10p -> 330p -> 0.1u -> IC ?

Thanks!

-
Some manufacturers provide a recommended PCB layout in their product datasheets. Does yours? –  Majenko Jun 27 '14 at 19:27
@Majenko Thanks, but no. They are responsive to email questions, but they're on the other side of the world so I won't get a response until tomorrow... Schedule's tight :) –  bitsmack Jun 27 '14 at 19:29

The closest cap is inevitably always the smallest because the smallest cap will have the lowest/best capacitive reactance at the high frequencies where the chip supplier needs that decoupling: -

This is a good document by AVX on series resonance of capacitors and basically it's the series resonance of smaller caps that is higher hence while a big cap has turned inductive hundreds of MHz earlier, the smaller cap will still be ok.