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Plato CCD and Front-End Electronics. Dave Walton UCL/MSSL dmw @mssl.ucl.ac.uk 01483 204190. Overview. Two types of CCD/FEE Normal 32 telescopes Full-frame, no shutter Cadence = 25 s (22 s integration, 3 s readout) 2 ports per CCD, 4 Mpix/s/port Fast - PowerPoint PPT Presentation
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Plato Consortium Kickoff Meeting, Paris 109-Nov-2010
Plato CCD and Front-End Plato CCD and Front-End ElectronicsElectronics
Dave Walton UCL/MSSL [email protected]
01483 204190
Plato Consortium Kickoff Meeting, Paris 209-Nov-2010
OverviewTwo types of CCD/FEE
• Normal32 telescopesFull-frame, no shutterCadence = 25 s (22 s integration, 3 s readout)2 ports per CCD, 4 Mpix/s/port
• Fast2 telescopesFrame-transferCadence = 2.5 s (frame transfer 0.4 s)2 ports per CCD, 4 Mpix/s/port
Plato Consortium Kickoff Meeting, Paris 309-Nov-2010
Focal plane coverage
Plato Consortium Kickoff Meeting, Paris 409-Nov-2010
CCD progress – package and connections
Flexi length 120 mm. Trade-off between thermal isolation and bandwidth/interference
Plato Consortium Kickoff Meeting, Paris 509-Nov-2010
CCD Parameters
• 4510 x 4510 pixels per CCD18 µm pixel81.2 x 81.2 mm2 per CCD
• Full well >= 900 ke-
• Thinned, back-illuminated
• 3-side buttable
• Variant: Frame-transfer for fast cameras
• Total CCDs to fly = 136.
• Area = 0.9 m2
Largest CCD area ever flown (?)
Gaia CCD at MSSLPlato CCD is x2.4 largerIn area
Plato Consortium Kickoff Meeting, Paris 609-Nov-2010
Revised, smaller FEE enclosure
Flexi connecting the two PCB panels
CCD connectors
Plato Consortium Kickoff Meeting, Paris 709-Nov-2010
Normal telescope readout sequence
3 s 22 s
For normal telescope, unshuttered readout gives some image smearFor fast telescope, frame transfer time gives some image smearThese effects can be corrected if necessary
Plato Consortium Kickoff Meeting, Paris 809-Nov-2010
New 2 X 16 bit ADC proposal
Plato Consortium Kickoff Meeting, Paris 909-Nov-2010
Fast telecope differences• Frame-transfer operation
• Pixel rate per port 4 Mpix/s, same as normal telescope
• But CCDs read out in parallel continuously, 2.5 s cadence(so no multiplexing in analogue electronics)
• High data rate requires local DPU
Plato Consortium Kickoff Meeting, Paris 1009-Nov-2010
FIN