plato ccd and front-end electronics

Plato Consortium Kickoff Meeting, Paris 109-Nov-2010

Plato CCD and Front-End Plato CCD and Front-End ElectronicsElectronics

Dave Walton UCL/MSSL dmw@mssl.ucl.ac.uk

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