29 jul 2008paul dauncey1 some sensor noise measurements paul dauncey
TRANSCRIPT
![Page 1: 29 Jul 2008Paul Dauncey1 Some sensor noise measurements Paul Dauncey](https://reader036.vdocuments.net/reader036/viewer/2022082713/5697c01b1a28abf838ccf867/html5/thumbnails/1.jpg)
29 Jul 2008 Paul Dauncey 1
Some sensor noise measurements
Paul Dauncey
![Page 2: 29 Jul 2008Paul Dauncey1 Some sensor noise measurements Paul Dauncey](https://reader036.vdocuments.net/reader036/viewer/2022082713/5697c01b1a28abf838ccf867/html5/thumbnails/2.jpg)
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
![Page 3: 29 Jul 2008Paul Dauncey1 Some sensor noise measurements Paul Dauncey](https://reader036.vdocuments.net/reader036/viewer/2022082713/5697c01b1a28abf838ccf867/html5/thumbnails/3.jpg)
29 Jul 2008 Paul Dauncey 3
PCB jumpers• Set J23 (top) and J24 (bottom) to alternate position (left) or remove (right)
![Page 4: 29 Jul 2008Paul Dauncey1 Some sensor noise measurements Paul Dauncey](https://reader036.vdocuments.net/reader036/viewer/2022082713/5697c01b1a28abf838ccf867/html5/thumbnails/4.jpg)
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
![Page 5: 29 Jul 2008Paul Dauncey1 Some sensor noise measurements Paul Dauncey](https://reader036.vdocuments.net/reader036/viewer/2022082713/5697c01b1a28abf838ccf867/html5/thumbnails/5.jpg)
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