Here are some uncombed thoughts about how to “unnecessarily” complicate a Constant Current Source and/or a CC Mirror.
The concept a). is sort of obvious … But all the rest of them, from b). onwards, are somewhat untested, albeit potentially very interesting.
Feel free to play around with them, if you find added value therein.
(C) 2014-07-10, zjj_wwa 2014
Below: a), b). c). d). …
Below: e), f). g). ….