Radiant energy – Invisible radiant energy responsive electric signalling – Semiconductor system
Patent
1997-07-25
1999-07-20
Hannaher, Constantine
Radiant energy
Invisible radiant energy responsive electric signalling
Semiconductor system
250332, 348311, G01J 520
Patent
active
059258837
ABSTRACT:
An IR focal plane array (IR-FPA) includes an IR radiation detector (11a) having a plurality of IR radiation responsive photodetectors (PDs) and a readout integrated circuit (11) that includes a plurality of unit cells arranged in an N.times.M matrix. Each unit cell has an input coupled to an output of one of the IR radiation responsive photodetectors. The IR-FPA further includes M column amplifiers, preferably CTIAs, individual ones of which have an input that is coupled through one of N switches (.phi.tr) to individual ones of the N unit cells. A charge integrating capacitance in each unit cell is formed by a charge well underlying one (.phi..sub.1) of a plurality of transfer gates coupled between individual ones of the N unit cells that are coupled to one of the M column amplifiers. The plurality of transfer gates are a multiphase CCD, preferably a four phase CCD, and are clocked at a rate that is a function of a rate of scene image motion relative to a radiation receiving surface (10a) of the IR-FPA for transferring photodetector-generated charge packets from one row to a next, adjacent row during an integration period. In a further embodiment the M columns are partitioned into j column groups, wherein all transfer gates within one of the j column groups are clocked at a rate that is a function of a rate of scene image motion relative to the column group.
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Hannaher Constantine
Jiron Darren M.
Lenzen, Jr. G. H.
Raytheon Company
Schubert W. C.
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