CCD pixel-to-pixel variations

[dr.ir. A.J.P. GST Theuwissen]

Posted to CCD-world:
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Dear all,


We, at Philips, do tests of the PNRU for every device we ship to our
customers.  For the large area devices (pixel size 12 um, with vertical
anti-blooming) we measure the following typical values : @ 450 nm : 0.52
%, @ 550 nm : 0.54 % and @ 650 nm : 0.61 %.  
As far as the stability of PNRU is concerned : our Quality and
Reliability program, which is applied to all our product, never showed
any degradation of the PNRU.  (Q&R tests include 1000 hours @ 150 deg.
C, 1000 hours @ -60 deg. C, etc.)

Kind regards,


Albert Theuwissen
R&D manager Imaging Devices
Philips Semiconductors Image Sensors



Ken Smith wrote:
> 
> Posted to CCD-world:
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> Dr Smartt:
> 
> I have actual test data from EEV on PRNU (photoresponse non-uniformity) vs
> wavelength for the CCD-26, which is a 1353x286 frame transfer spectroscopic CCD,
> thinned, MPP (IMO) mode.  They used a monochronometer I believe.  So here goes:
> 
> Wavelength (nm)    PRNU (%)
> 
> 250                7.2
> 270                7.4
> 300                7.2
> 350                2.5
> 400                1.4
> 450                1.2
> 500                1.0
> 550                1.0
> 600                0.97
> 675                0.95
> 755                2.4
> 765                2.8
> 775                3.4
> 925                16.3
> 940                18.1
> 955                20.0
> 
> I don't have actual image data at each wavelength from which the above numbers were
> determined, so I don't know how PRNU varies spatially, other than I suspect it
> changes slowly over the CCD due to different thinkness of the wafer etc.
> 
> As far as long term variation in PRNU is concerned, I am looking for that sort of
> data myself.  I suspect data is available, but not in any convenient summary form,
> but just massive raw flat field calibration archives.  The Hubble Space Telescope
> web site may have a lot of such data on line, but the CCD is subject to space
> radiation effects.  You also have to be careful in making sure in what conditions
> was the CCD kept in interpreting the data.  Was it always in vacuum, N2, in and out
> of a cooler, handling, does it have a UV coating or other surface treatments, UV
> flash, etc ?  Otherwise you will have an apples and oranges situation.  I believe
> the EEV CCD you are talking about is thinned and any treatments/coatings would be
> fairly stable.
> 
> Ken Smith
> Routes Inc
> Ottawa, ON
> Canada
> 
> -+-+-+-
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