Designing a Planetary Gearbox to increase speed?

[scuba1000]

I have been researching ways to design a planetary gearbox. It seems that the main configuration of the gears is to have the ring gear fixed, output the rotation of the planet gear carrier, and use the sun gear as the input. This would produce a reduction.

I have found little information about using a planetary gearbox the other way around to multiply speed. Is it commonly done or is there some other alternative to this? The design would be to have the ring fixed, the gear carrier as the input, and the sun as the output. Is the ratio just the reciprocal of the normal ratio.

I did see that the Wikipedia article on planetary gearboxes said that the ratio for what I'm talking about is 1+ Nring/Nsun. But it said a citation is needed, so I just wanted to double check.