kidman wrote on Jun 18th, 2009, 11:11am:This is the quarter size transistor method. You can read about it in grey&meyers book
Gotcha. Yeah, it's in there. Usually I use the one a few pages later, "MOS high-swing current mirror with two input branchs" which has better input headroom.
Two transistors collapse into one, atleast 1/4 or smaller after Body Effects.
cheers,
Wave