A small-pixel MTF CCD project

[MY PIXEL]

Posted to CCD-world:
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In a message dated 98-01-13 09:20:24 EST, geary at cfa.harvard.edu writes:

<< 
 Hi Jim,
 
 The reason for the 4K (V) X 1K (h) partitioning is because of diffentential
 tracking required for drift scanning on a wide Schmidt camera field.  Each
 narrow field needs to be individually clocked in the vertical direction to
 approximate the local sidereal rate.

*********jj
Yes, Jim McCarthy explained all this too me yesterday (he is Pixel Vision
consultant). Thanks for pointing  this out to me.
*********jj


 The issue of defocuss for backside-illuminated small pixels is of course
 nontrivial.  Thinning to 10u or less on hi-res material will help, plus
 there may be a special tweak called "Hi-CTF" (details unknown to me) that
 Sarnoff believes can produce less than 20% crosstalk on these small pixels.
 But it is a concern.

********jj
Yes we saw the problem in spades for the  backside 9-micron CCD. The problem
observed is when the frontside depletion region is made closer to the backside
(for good MTF) dark current starts coming up (an indicator of a non pinned
backside surface). Therefore, one might need to compromise dark current for
MTF. Also scattered light becomes an issue ..  . what is the support structure
(the concern here is IR reflection and scattering)?
********jj
 
 The Curacao Eclipse Dive:  I was so looking forward to it, but just this
 week I was informed that my father is scheduled for very extensive and
 life-threatening surgery that week (last week of Feb).  So, it looks like I
 will not be going.  Am looking for a replacement couple for this very
 special diving/eclipse holiday.  Contact me at geary at cfa.harvard.edu if
 anyone is interested.  Jim, can you contact Jeff pinter and have him give me
 a call at (617)495-7431?  I have some travel info for him.


******jj
Will relay to Jeff (he is at Pixel Vision now ..  . long story). Sorry to hear
about your dad and your vacation plans . . .I had a bout with my dad last year
(open heart surgery. . . valve replacement) ? Watch out for those HMO gate
keepers .. .  they can be killers. Hang in there with all of this.
*******jj
 
 --John Geary
 geary at cfa.harvard.edu
 
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  >>

**************jj
Jim Janesick @ mypixel at aol.com
*************jj
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For information about CCD-world, send email to owner-CCD-world at cfht.hawaii.edu.