Solid-state imaging device
According to one embodiment, a solid-state imaging device includes a pixel array unit where pixels are disposed in a matrix and a column amplifying circuit that is disposed at an end of the pixel array unit and amplifies a unit signal of a unit pixel read from each pixel with at least first and second amplification factors, and outputs a plurality of amplified signals.
1. A solid-state imaging device, comprising:
a pixel array unit in which pixels are disposed in a matrix;
a column amplifying circuit that is disposed at an end of the pixel array unit and amplifies a signal read from each pixel;
an amplification factor switching circuit that switches an amplification factor of at least a unit signal of a unit pixel to first and second amplification factors;
a comparator circuit that executes A/D conversion on the signals amplified by the column amplifying circuit;
a first up-down counter circuit that counts a digital value of a signal which is obtained by amplifying a digital signal of an output of the comparator circuit with the first amplification factor;
a second up-down counter circuit that counts a digital value of a signal which is obtained by amplifying a digital signal of an output of the comparator circuit with the second amplification factor; and
a plurality of line memories that store the digital values counted by the first up-down counter circuit and the second up-down counter circuit respectively,
wherein a plurality of signals read from the plurality of line memories are output in parallel.
2. The solid-state imaging device of claim 1 , further comprising:
a synthesizing unit that synthesizes the plurality of output signals.
3. The solid-state imaging device of claim 2 ,
wherein the synthesizing unit includes an amplifying circuit that amplifies the output signal having a small amplification factor.