An image sensor having a plurality of pixels, each including a sense node;
an output node; a first device, connected to the sense node, producing a
signal at the sense node that is proportional to incident light intensity
at the pixel; at least one select node to receive a first select signal
for selecting the pixel output node from the plurality of pixels; a reset
device for resetting the pixel; and a sample and hold circuit including a
sample node coupled to the sense node. At least one amplifier is
provided, including a first input node to receive an output signal from
the output node of a selected pixel and a second input node connected to
a reference voltage source provided as a reference to reset a selected
pixel. An amplifier output node is connected to couple an amplifier
output signal to a selected pixel's sample and hold circuit.