  At BESSY the standard 16 bit resolution of the corrector power supplies was
insufficient for the continous orbit drift correction. A new sophisticated
design of the analog/digital I/O board increases the resolution of the analog
output up to 24 bits without suffering on losses in the long term stability or
the dynamic range of the correctors. This is achieved by a cost-efficient
boarddesign using standard 16 bit DAC devices in an range-overlapping
fine/coarse architecture.
