| 摘要 |
A current signal corresponding to the amount of incident light detected by a photoelectric conversion device 13 is inputted to and integrated by an integrator circuit 30, whereby a voltage signal is outputted from the integrator circuit 30. When a switch 40 is closed, the voltage signal outputted from the integrator circuit 30 is inputted to a capacitor 51 of a variable capacity integrator circuit 50, a change of the voltage signal is inputted to an amplifier 52, and an electric charge corresponding to the change of voltage signal and the capacity value of a variable capacity part 53 flows into the variable capacity part 53. The capacity value of the variable capacity part 53 is controlled by a comparator 60 and a capacity control section 70 such that the value of integrated signal outputted from the variable capacity integrator circuit 50 coincide with a reference value. The capacity control section 70 outputs a first digital signal corresponding to the capacity value of the variable capacity part 53. As a consequence, a solid-state imaging device which is excellent in S/N ratio, yields no offset errors even when its amplifier have offset fluctuations, and has a small circuit scale is obtained.
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