Disclosed is an image pickup apparatus, which comprises a two-dimensional
image pickup area, a vertical line selector for selecting a reading row in said
image pickup area, a plurality of vertical signal lines arranged in columnar direction,
for reading a detection signal emitted by a photodiode located in a selected row,
and a horizontal selection transistor for continuously reading detection signals
carried by the vertical signal lines and writing the signals to a horizontal signal
line arranged like a row in a matrix, wherein a noise canceling circuit that employs
a capacitor to suppress noise that appears on the vertical signal lines is provided
between the vertical signal lines and the horizontal selection transistor, wherein
an impedance conversion unit is provided between the vertical signal lines and
the capacitor of the noise canceling circuit, and wherein a constant current element
for supplying a bias current and a switch for changing the output current of a
constant current element are provided to the impedance conversion unit.
