UKIRT Wide Field Camera

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UKIRT Wide Field Camera Derek Ives, UKATC
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CDS Bias Frame Reset Anomaly Issues
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More Importantly Stability Issues for Flat
Fielding
CDS2 CDS1
CDS3 CDS1
CDS3 CDS2
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More Importantly Flat Field Stability
CDS2 CDS1 CDS3 - CDS2 etc.

• Now Stable Flat Fielding
• Low Frequency Banding now seen
• Solution fast throw away reads after reset

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Low Frequency Banding Issues
Banding 7Hz Pseudo Differential Circuit
/- 10 ADU p-v Changes frame by frame Same
bands on 4 Quadrants
Reported by ESO Removal using underscan bias
subtraction Noise drops from 20 e to 16 e after
flattening using underscan Need to perform
on frame by frame basis
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Inter-channel cross talk
Projected Spot Adjacent ghosts
Profile of adjacent channel ghosts