Multipurpose readout integrated circuit with in cell adaptive non-uniformity correction and enhanced dynamic range
US6040568A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 6, 1998 |
| Grant date | Mar 21, 2000 |
| Priority date | — |
| Expiry date | May 6, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01L2924/0002
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An IR-FPA (10) having a plurality of radiation detectors (2a) and a multipurpose ROIC (2) is disclosed. The radiation detectors (2a) are organized as a two dimensional array. The multipurpose ROIC (2) includes a plurality of readout circuit unit cells, individual ones of which are coupled to individual radiation detectors (2a) for receiving electrical signals therefrom. Each of the readout circuit unit cells operates in one of a first mode to provide a corrected m frame averaged output signal (Vout.sub.THPF) or, a second mode to provide a subframed averaged output signal (Vout.sub.2). In the first operating mode, a high pass filtering circuit subtracts a low frequency charge pedestal from the electrical signal to form the corrected m frame averaged output (Vout.sub.THPF). Also disclosed is a method for operating an array of radiation detectors (2a) which includes the steps of: within a sampling period that defines a frame comprised of subframe periods, generating an electrical signal in individual ones of the radiation detectors, the electrical signals being generated in response to incident radiation; in a first operating mode, forming a high pass filtered output signal (Vout.sub.…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.