RobG
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It depends on your load, resolution, and what your process is. You say most recent process, but you are using 1.8V. That doesn't add up.
I agree with loose-electron in that switched current is going to be the fastest, but depending on your specs other topologies can work at 110MHz.
Capacitive DACs are plenty fast. ([3] Wang, F.-J.; Temes, G.C.; Law, S., "A quasi-passive CMOS pipeline D/A converter," Solid-State Circuits, IEEE Journal of , vol.24, no.6, pp.1752-1755, Dec 1989).
If you can drive your load with an RC filter you can probably do the design with a tapped-R dac.
I can't say if these are appropriate for your design since you haven't given enough information.
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