A pixel circuit with a dual gate PMOS is formed by forming two P.sup.+
regions in an N.sup.- well. The N.sup.- well is in a P.sup.- type
substrate. The two P.sup.+ regions form the source and drain of a PMOS
transistor. The PMOS transistors formed within the N.sup.- well will not
affect the collection of the photo-generated charge as long as the source
and drain potentials of the PMOS transistors are set at a lower potential
than the N.sup.- well potential so that they remain reverse biased with
respect to the N.sup.- well. One of the P.sup.+ regions used to form the
source and drain regions can be used to reset the pixel after it has been
read in preparation for the next cycle of accumulating photo-generated
charge. The N.sup.- well forms a second gate for the dual gate PMOS
transistor since the potential of the N.sup.- well 12 affects the
conductivity of the channel of the PMOS transistor. The addition of two
NMOS transistors enables the readout signal to be stored at the gate of
one of the NMOS transistors thereby making a snapshot imager possible.
The circuit can be expanded to form two PMOS transistors sharing a common
drain in the N.sup.- well.