Subject: Vbiasgate
From: [email-masked]
To: [email-masked]
Cc: [email-masked], [email-masked], "Bill Forrest" <[email-masked]>, "Craig McMurtry" <[email-masked]>, "Rob Simcoe" <[email-masked]>
Date: Fri, 4 Sep 2009 16:12:30 -0400 (EDT)

We spent a fair amount of time working on Vbiasgate.

Values modestly higher and lower than the default value of 2.05 V led to
images (in single ended mode, single images) which did not look correct. 
namely, the picture frame is brighter (instead of fainter) than rest of
image, and the "tree rings" are mtued or absent.

You can see this in images below.
Vbiasgate=2.05 (default), Vrefmain=1.5 "CorrectImage"

Vbiasgate=2.041, Vrefmain=1.4V "Incorrect"
Both images had histogram means of ~5700, and no zeros

Tried changing Vreset for Incorrect, no help on tree rings or picture frame.

Any suggestions?

Judy