> > You MAY be able to current sense at lower voltage drops using
> a long tailed
> > pair using only two (or possibly three) transistors.
>
>     I am not quite sure that I could trust the match between the
> transistor to form a differential amplifier and get good results

How about a supermatch pair, eg LM394 ?

http://www.national.com/pf/LM/LM394.html

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