TIA's Glossary of Telecommunication Terms
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specific detectivity
For a photodetector, a figure of merit used to characterize performance, equal to the reciprocal of noise equivalent power (NEP ), normalized to unit area and unit bandwidth. Note: Specific detectivity, D *, is given by 
where A is the area of the photosensitive region of the detector and 
f is the effective noise bandwidth. Synonym D-Star.