Loading patent…
AssigneeNu-Trek, Inc.
InventorsStephen Holden Black, Paul Richard Behmen, Francisco Tejada
Estimating the term…
A photodetector interface circuit is described, residing partially or fully within a unit cell per pixel of an FPA. The interface circuit uses an innovative approach to providing pixel level digitization for full frame integration times while maintaining the ability to use integration capacitors of practical sizes. The technique uses successive charge subtraction, removing charge from an integration capacitor successively, triggered by the charge increasing sufficiently to charge the integrator to a reference level, thereby triggering both charge removal and incrementing a count, until all of the current flowing in the photodetector has been accounted for and the count represents the digitization of the photodetector signal. Various options on how to arrange the digitization elements are also disclosed.
An interface circuit for a photodetector providing digitization of the current flowing in the detector, comprising;
Dependencies are inferred from the claim text.