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7 dFred Bloggs turned me on to this circuit patented by Analog Devices:
. . -Is->
. . ----+------[Rs]------+----- . | | . [R] [R] . | | . .----+ | . | | | . | >| |< . | Q1 |-----+------| Q2 . | /| | |\\ . | | |< | . | +-----| Q3 | . | | |\\ | . >| | | | . Q4 |-------------------+ . /| | | | . | / \\ | / \\ . | | I | | | I | . Io \\ / | \\ / . | | | . | | | . '-------+--------' . | . --- . Yair, the ground currents gotta be fixed, not a mirror. If I use my circuit I'll replace the output transistor with a p- channel mosfet. gotta go.