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Short wavelength hgcdte staring focal plane for low background astronomy applications
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Maschhoff, K. Hall, D. Hartle, N. Lacroix, D. Stobie, J. |
| Copyright Year | 1989 |
| Description | The design of a 128x128 staring short wave infrared (SWIR) HgCdTe focal plane incorporating charge integrating transimpedance input preamplifiers is presented. The preamplifiers improve device linearity and uniformity, and provide signal gain ahead of the miltiplexer and readout circuitry. Detector's with cutoff wavelength of 2.5 microns and operated at 80 K have demonstrated impedances in excess of 10(exp 16) ohms with 60 percent quantum efficiency. Focal plane performance using a smaller format device is presented which demonstrates the potential of this approach. Although the design is capable of achieving less than 30 rms electrons with todays technology, initial small format devices demonstrated a read noise of 100 rms electrons and were limited by the atypical high noise performance of the silicon process run. Luminescence from the active silicon circuitry in the multiplexer limits the minimum detector current to a few hundred electrons per second. Approaches to eliminate this excessive source of current is presented which should allow the focal plane to achieve detector background limited performance. |
| File Size | 771573 |
| Page Count | 16 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19900012020 |
| Archival Resource Key | ark:/13960/t2g789039 |
| Language | English |
| Publisher Date | 1989-10-01 |
| Access Restriction | Open |
| Subject Keyword | Astronomy Multiplexing Photovoltaic Effect Radiation Detectors Circuits Readout Luminescence Infrared Astronomy Focal Plane Devices Mercury Cadmium Tellurides Quantum Efficiency Linearity Infrared Radiation Silicon Preamplifiers Electrons Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Article |
