what can i do with a current source from 5ua to 270ua if i want some sort of active digital components
Could you please give more details about what you are wanting to do? What is the context of your question? IC design, circuit design, system design? What is your "current source"?
system provides the current in a "this is all you get" sort of way and no voltage bias. I want to be able to actively control current to some diodes over temperature. Currently this is accomplished passively through the use of a thermistor based network, and it sucks!