Kai Klaas wrote:
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This demonstrated, that not the inductivity of decoupling capacitor was the cause of ripple, but the thin wires making the connection to chip pins. And the only way to heavily reduce this inductivity is to use solid ground plane. You will be surprised to see, how much the ripple can be reduced, when using solid ground plane and locating decoupling capacitor as close as possible to Vcc pin!

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I remember (from a previous life...) that there was a company (Rogers http://www.rogerscorporation.com , I used to work for them some 15 years ago) offering a capacitor that was as large as the surface of the IC, was very thin, and had 2 pins that were inserted in same hole on PCB as IC. The whole capacitor fitted underneath the IC. I had a quick look at their website, but looks as if the product has been discontinued. The product was a derivative of their mini-busbar product. If someone's interested, I'll try and upload a photograph of this component-species..

rgds
Patrick