29 jul 2008paul dauncey1 some sensor noise measurements paul dauncey
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29 Jul 2008 Paul Dauncey 1
Some sensor noise measurements
Paul Dauncey
29 Jul 2008 Paul Dauncey 2
Dependence on settings• With (solid) and without (dashed) strong desk lamp
• Higher noise unlikely to be due to light leaks
29 Jul 2008 Paul Dauncey 3
PCB jumpers• Set J23 (top) and J24 (bottom) to alternate position (left) or remove (right)
29 Jul 2008 Paul Dauncey 4
Relook at i12CompBias2 • Previously saw a significant change to S/N; noise from comparator?
• Recheck with a different pixel
• Use laser to give fixed signal size; vary i12CompBias2
• Different colours are different groups of runs• Blue was steps of 4TU, pink and yellow 1TU
RMS below 1TU
29 Jul 2008 Paul Dauncey 5
Signal/Noise ratio• Take ratio to get signal/noise
• Seems like a factor ~3 improvement in S/N…
• ...but could not see a Fe55 signal with a brief run
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