Tek CTE etc

[Paddy Oates]

Bjarne,
	Thanks for your reply. I hope to be trying out 1 or 2 suggestions to see
if we can make any difference...

	To answer your questions-
	(1) Yes the tail is dependant on the signal level the poor CTE is only
	really seen at low signal levels. We pre-flash the chip with some
	LEDs we have in the dewar to give us a few hundred units signal. The
	trail in the H overscan is what we have left after 50+1024 	
	(underscan+image) horizontal shifts. At higher signal levels the pixel
	level falls back to the bias within a pixel or 2 into the over-scan.

	(2) Yes we had a problem with the oSW causing feed-thru and only finally
	overcame its effects (hi bias, noise)  by performing a transition down 	
	and up between the 2 halves of the CDS. I agree performing the oSW with 
	oH clocks negates the use of this phase for summing and, as important, 
	we make the oSW transitions fairly rapid to keep the time between the 
	CDS REF and SAMP as short as possible. 

Cheers
Paddy

PS,
anyone want to buy a TEK1024- we had one sent as replacement for an out-of-spec 
device from SITe. They had measured the device parameters at  -45, not -90 as 
their glossy states and so they were willing to change it. Apparently SITe now 
charge 10% EXTRA for a spec. at -90deg C !!!!!
We will have to send it back as the chip we got is okay and has been sent to
La Palma, well, we still have the CTE problem mentioned on my Web Pages....

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