Thursday, March 03, 2011

Dexela 23 cm x 29 cm (!) 12MP CMOS Imager

Talking about huge imagers, like one presented by Canon at ISSCC, there is even bigger CMOS sensor made by Dexela, model 2923, first announced a year and a half ago:

  • Resolution: 3888 x 3072 pixels
  • Sensitive area: 290.8 mm x 229.8 mm
  • Pixel size: 74.8 um
  • Saturation charge: 1.4 Me- in high saturation mode, 0.36 Me- in high sensitivity mode
  • Dynamic range: 70dB typ. in high saturation mode, 66dB typ. in high sensitivity mode
  • Dark current: 8000 e-/s (typical at 40C)
  • ADC resolution: 14 bits
  • Speed: 26 fps at full resolution
  • Power consumption: 45 W max (active)
  • Power down current: <150 mA

The sensor is intended for X-Ray sensing applications. Packaging of such a huge and power hungry sensor is also challenging: the package weights 5.5kg and includes two fans:


  1. Albert TheuwissenMarch 3, 2011 at 6:10 PM

    The diagonal of the sensor is 370 mm, which does not fit to a 300 mm wafer, so I guess this is not a monolithic CMOS imager or am I wrong ?

  2. Albert, would you mind clarifying which counter is which in the "ISSCC Review, Part 5" thread?

  3. It it tiled from four of these - - sensors.

  4. True, Dexela too mentioned it's tiled:

  5. Albert TheuwissenMarch 4, 2011 at 11:40 AM

    to CDM : the lower bit counters have the common counter for 248 columns, the upper bit counters have an individual counter in every column. Hope this answers your question.

  6. The least-significant bit (LSB) is the one that flips at every clock cycle and counts the smallest time increment. Is this bit included in the lower bit counters or in the upper bit counters?

    I am basically wondering whether the fastest counting rates are in the pitch-matched up-down counters or in the shared counters.

  7. Albert TheuwissenMarch 5, 2011 at 12:39 PM

    to CDM : right, LSB are the ones that flip the most.


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