Документ взят из кэша поисковой машины. Адрес оригинального документа : http://www.eso.org/projects/www.eso.org.projects.ngc/Hardware/2004_12_08-Reyes-NGCinterfacetoAO.pdf Дата изменения: Mon Mar 12 16:23:01 2007 Дата индексирования: Sun Apr 10 23:49:38 2016 Кодировка: Поисковые слова: dark nebula

CCD head for AO
· In scientific applications the detector head can be 1 to 3 meters away.

· In sensing applications the analog front-end must be close to the CCD. · Hard requirements for clock drivers, high-speed PCB routing... · Analog and digital electronics can be perfectly decoupled Analog and digital electronics can be developed separately.
Dec 2004, Javier Reyes

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A possible implementation
Upcoming AO heads will have front-end electronics with integrated bias, clock and ADCs

XILINX

Optical link to Back-end computer

DIGITAL

Dec 2004, Javier Reyes

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NGC for scientific applications

Back-end computer

Front-end electronics

Optical/IR cryostat

Dec 2004, Javier Reyes

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NGC for sensing applications
Pixels sent through PCI back-end Backbone controller (90%) remains the same between scientific and sensing applications (even software)
RTC Back-end computer AO head

Pixels sent directly to RTC
AO head

RTC

"mini"-NGC front-end for AO

Back-end computer
Dec 2004, Javier Reyes

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Some thoughts

Definition of an interface could be the key to incorporate design ideas and experience into NGC. The "mini"-NGC backbone can also address the read-out of ASICs.

Dec 2004, Javier Reyes

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