1. Andrei Nomerotski 1 Andrei Nomerotski, University of Oxford 23 July 2008 ISIS3 specs

2. Andrei Nomerotski 2 ISIS3 Goals  Choose process based on ISIS2  Optimized pixel geometry  Readout architecture  Smaller pixel; goal: 20um x 20 um  Larger sensors : 1x1 cm 2

3. Andrei Nomerotski 3 Optimized Pixel Geometry  Imaging pixel dimensions do not coincide with pixel dimensions u ISIS2: two fold repeat  pixel 10x80  m 2 ; imaging pixel 20x40  m 2  Square pixels  Three fold repeat in ISIS2 would give 27x27  m 2 imaging pixel 80 μm 10 μm Source follower Pad Current load

4. Andrei Nomerotski 4 Readout Architecture  Column-wise with pixel addressing by Row Select u Need to move charge between memory cells as well u Same as Jessica  Each column has preamp & CDS  16 columns are multiplexed to one ADC  320  m per ADC = good 8-bit ADC  Output of all ADCs serialized into LVDS outputs u Small total number of pads u Total data rate for ILC parameters 0.5 GB/sec 80 μm 10 μm Source follower Pad Current load ADC Multiplexer Columns Serializer

5. Andrei Nomerotski 5 Pixel Size  ISIS2 : 10 x 80  m 2  Buried channel width : 5  m  Remaining 5  m for connections/overheads  3-phase CCD, gate width: 0.75  m + 0.25  m gap  ISIS2 design did not push limits  But big savings are not possible in 0.18  m u Need to consider well capacity, now ~ 8ke  ISIS3: if pixel 8x65  m 2 then 22x22  m 2 imaging pixel

6. Andrei Nomerotski 6 Sensor Dimensions  ISIS2 u Multi-project run 1cm x 1cm u four 5mm x 5mm ‘seeds’   1cm x 1cm possible in MP run  2 cm x 2 cm is not a MP run, need to pay for the whole mask  Stitching at Jazz is expensive because nobody yet paid NRE for stitching at Jazz u NRE 100s k u No NRE ~20k

7. Andrei Nomerotski 7 Comparison to Other Sensors  Jessica’s Rolling Shutter is similar to ISIS readout architecture u Column-wise with Row Select addressing