Appeal No. 1998-2877
Application No. 08/567,680
Claim 12 is the only independent claim on appeal, and it
reads as follows:
12. An active transistor charge detection device with a
positive feedback circuit comprising:
an active transistor pixel charge detection device
having:
a semiconductor substrate of a first
conductivity type;
a semiconductor layer of a second conductivity
type in the substrate;
virtual phase regions of the first conductivity
type formed in the semiconductor layer, the virtual
phase regions forming virtual phase potential areas
for carriers of the second conductivity type;
a transistor source region of a first
conductivity type formed in the semiconductor layer and
spaced apart from the virtual phase regions;
a charge drain region of a second conductivity
type formed in the semiconductor layer and spaced
apart from the virtual phase regions;
an insulating layer on the semiconductor layer;
a transistor gate electrode formed on the
insulating layer and located above a portion of the
semiconductor layer that surrounds the transistor
source region between virtual phase regions, the
transistor gate electrode forming a transistor
potential well for carriers of the second
conductivity type in response to a voltage;
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