Saturday, November 28, 2015

CMOSIS Pre-Announces Fast & Large 2MP Sensor

Next week, CMOSIS will introduce the CSI2100 2MP CMOS sensor. Its features include a 1440 x 1440 pixel array with 12 µm B&W GS pixels and a 500 fps frame rate in 10-bit mode. The sensor boasts a a full well capacity of 2 Me-/pixel and is optimized to detect small signal variations in bright images captured at high-speed. This makes it suitable for medical, scientific and industrial applications. The CSI2100 evaluation kit was co-developed with Pleora Technologies.

Posted by Vladimir Koifman at 10:46

22 comments:

  1. AnonymousNovember 30, 2015 at 11:22 AM

    FWC of 2 Me-/pixel? really?

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  2. AnonymousNovember 30, 2015 at 11:55 AM

    Why not? In 12um pitch, you can put 200-300fF of cap equivalent to 2-3Me- FWC. They might not be integrating on SFD node.

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  3. AnonymousNovember 30, 2015 at 11:56 AM

    May I know the power consumption? That will say a lot!

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  4. AnonymousNovember 30, 2015 at 2:06 PM

    It's a simple 3T pixel.

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  5. Peng November 30, 2015 at 2:36 PM

    Is this from one of IISW 2015 papers? Which is 700fps, 2Me- and1400*1400.

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  6. AnonymousNovember 30, 2015 at 3:44 PM

    Looks like good news for shot-noise-limited applications where sufficient light can be made available - of which there are quite a few.

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    Replies
    1. AnonymousNovember 30, 2015 at 3:50 PM

      10-bit ADC cannot assure shot-noise-limited applications.

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    2. AnonymousDecember 1, 2015 at 10:02 AM

      why not? SNR_ADC (=2^10/sqrt(12)) > SNR_pixel (=sqrt(2M))

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    3. AnonymousDecember 1, 2015 at 12:25 PM

      hi, not sure you did the arithmetic.

      snr of ADC is 1024/sqrt(12)=295.6 while sqrt(2M)=1414.

      Pretty sure that the 10B ADC cannot provide shot noise limited detection.

      Delete
    4. AnonymousDecember 1, 2015 at 1:51 PM

      signal is 1024 LSBs, noise is 1LSB/sqrt(12), signal to noise is 1024 /(1/sqrt(12))=3550! CLEAR????

      Delete
    5. AnonymousDecember 1, 2015 at 8:28 PM

      I'm yet to meet a single ADC that has a SNR greater than the number of LSBs it can represent. Most have a quantization noise that is < 0.5LSB and most provide much worse performance, especially on-chip devices.

      I think you should bring this ADC wonder to market ASAP! I'll be the 1st in line to buy it!

      Delete
    6. AnonymousDecember 1, 2015 at 9:39 PM

      correction

      ... noise that is > 0,5LSB

      Delete
    7. Vladimir KoifmanDecember 1, 2015 at 10:17 PM

      Well, not all are that bad. For instance, look at Intersil ADCs. Performance of some of them is quite close to an ideal one:

      ISLA118P50: 8b physically, 7.99 ENOB - close to the ideal, right? And this is in mass production.

      http://www.intersil.com/en/products/data-converters/high-speed-a-d-converters/a-d-converters/ISLA118P50.html

      Delete
    8. AnonymousDecember 2, 2015 at 12:19 AM

      I agree, some ADC's are nearly ideal. And the 7.99 ENOB for an 8bit ADC is the best I've seen. thanks!

      My beef is the suggestion that a10b ADC could have an ENOB that is bearly 12bits, which is what was suggested by the original poster... and hence could provide a shot noise limited detection capability for a 2Me- full well.

      All good.

      Delete
    9. AnonymousDecember 2, 2015 at 9:00 AM

      You still confuse LSB with q. noise and you still confuse Telekom ADCs with IS ADC...Can some experts explain this for all? Cmosis, Albert, Erik?

      Delete
    10. AnonymousDecember 2, 2015 at 2:05 PM

      Albert has a blog post which I think covers the confusion. The ADC does not cover the full range of the sensor only the linear portion. http://harvestimaging.com/blog/?p=1238

      Delete
    11. AnonymousDecember 3, 2015 at 3:00 AM

      I beg your pardon... but since I'm in the business of designing and building these so called "IS" units, I'm almost certain that I do not confuse anything right now.

      bottom line is that if you have an ADC with 1024 LSBs, the best it can do is display a full range of 1024:1. Even if the ADC had zero noise, it makes not difference since it can't display anything between 0 and 1, 1 and 2, 2 and 3, etc. Hence... it can't convey information about 1440 levels of brightness.

      And since most ADCs don't come anywhere near ideal numbers (12B ADCs have typical ENOB's of 10, 14B ADCs have a bit over 12 and 16B ADCs a bit over 14), and since most CIS ADCs have similar numbers, I don't see how a 10B ADC can ever provide enough dynamic range to handle 2Me.

      Delete
    12. AnonymousDecember 3, 2015 at 8:44 AM

      Measure a number of times and average the result?

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    13. AnonymousDecember 3, 2015 at 10:31 AM

      Pixel noise is the standard deviation measured over number of frames so the noise can be any number between zero and one.

      Delete
  7. AnonymousDecember 1, 2015 at 8:19 AM

    2 Me/pixel sounds hyperbolic! How does one ever reset this photodiode? For reasonable voltages available on the chip it is impossible to fully deplete this PD. And too high voltage triggers other leakage mechanisms!

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  8. UnknownDecember 1, 2015 at 12:14 PM

    Maybe because it is not a Pinned Diode ?

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  9. AnonymousOctober 25, 2016 at 6:26 AM

    May I know readout noise of CSI2100?

    ReplyDelete

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