An image pick-up apparatus and an image pick-up system constructed to prevent
occurrence of random noise in a photographed image due to a random noise component
produced in a reference supply circuit. An image pick-up apparatus has an area
sensor driven by matrix driving, and a reference supply circuit for supplying a
reference voltage for driving of the area sensor, and the reference voltage is
supplied through a low-pass filter (LPF) coupled to the reference supply circuit.
Further, a cutoff frequency of the low-pass filter preferably is determined so
that an effective value of noise of the reference voltage having passed through
the low-pass filter becomes not more than one-tenth of an effective value of random
noise produced in pixels of the area sensor.