CMOS for driving MOSFETS?

Why not use smaller mosfets to drive larger mosfet gates? One could put them
in the same package so that logic level signals could be used to drive large
mosfets? I'm thinking of implementing that idea discretely but maybe there
is a reason for it? (although its going to cost me about 2x the # of
transistors but its a clean switch)

I imagine that one probably could cascage cmos stages indefinitely to get
very low gate drive requirements?

http://server6.theimagehosting.com/image.php?img=CMOS-CAS.GIF

The above is just an example, I use the same mosfets in each stage but the
point is that each stage is easier to drive. (one might only need 1 or 2
stages for most fets).

Is there any problem with this? (Besides the number of mosfets, but I
imagine its no problem to do in silicon)

Thanks,
Jon


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