CMOS image sensor

A CMOS image sensor for getting images by outputting in order image signals sensed in each of pixel areas arranged like a matrix on the basis of X-Y addressing, the sensor comprising:

• pixel circuits each including:
• a photoelectric conversion element for carrying out the photoelectric conversion of incident light,
• a reset transistor for resetting a cathode of the photoelectric conversion element to initial voltage,
• an amplifying transistor for converting electric charges accumulated in the photoelectric conversion element to voltage, and
• a row selection transistor for outputting voltage output from the amplifying transistor as image signals corresponding to one pixel on the basis of a row selection signal to select signals output from the pixel areas arranged in a row direction;
• and
• a voltage control circuit for controlling a cutoff frequency for a low-pass filter formed by ON-state resistance of the reset transistor and parasitic capacitance produced at the cathode of the photoelectric conversion element during a period when the photoelectric conversion element is reset by controlling a potential of a gate of the reset transistor.