Patent ID: 8174600

Claim:
An image sensing apparatus comprising: a plurality of pixels each including a photoelectric conversion unit; a signal line connected to the plurality of pixels; an output unit; and a transfer block which transfers, to the output unit, a first signal and a second signal that are output from a readout pixel to the signal line at different timings of a period in which the readout pixel is being selected among the plurality of pixels, wherein the transfer block includes a first transfer unit and a second transfer unit, the first transfer unit includes a first impedance converter which transfers the first signal to the output unit, the first transfer unit transfers, as a third signal, a difference signal between a first offset of the first impedance converter and a signal obtained by superimposing the first offset on the first signal to the output unit, the second transfer unit includes a second impedance converter which transfers the second signal to the output unit, the second transfer unit transfers, as a fourth signal, a difference signal between a second offset of the second impedance converter and a signal obtained by superimposing the second offset on the second signal to the output unit, and the output unit generates and outputs an image signal indicative of a difference between the third signal and the fourth signal.