Abstract: The signal current corresponding to an incident light intensity is output from a photodiode, and the integrating circuit stores an electric charge according to the signal current and outputs a signal voltage corresponding to the amount of the stored electric charge. The first CDS circuit stores in the integrating capacitor an electric charge corresponding to a change in the signal voltage output from the integrating circuit. Similarly, the second circuit stores in the integrating capacitor an electric charge corresponding to a change in the signal voltage output from the integrating circuit. The difference calculation circuit determines a difference between the amount of charge stored in the integrating capacitor of the first CDS circuit and the amount of charge stored in the integrating capacitor of the second CDS circuit, and outputs a signal voltage corresponding to the difference.

Abstract: A drive circuit 270 having a differential amplifier 271, a current controller 272 formed from an n-channel MOSFET, and a drive ability control circuit sets its output drive ability in a high state only in a signal read, and otherwise sets the output drive ability in a low state to reduce power consumption. Thus, a solid-state image sensing device which can perform a high-speed read while ensuring low power consumption and wide dynamic range can be implemented. As the drive ability control circuit, for example, a current source 273 formed from an n-channel MOSFET and voltage switching by a drive change-over switch 274 can be used.