Patent ID: 8754973

Claim:
A solid-state imaging device that includes a plurality of unit pixels arranged in rows and columns and reads a pixel signal from the unit pixels selected for each of the rows, the solid-state imaging device comprising: column signal lines each provided for a corresponding one of the columns of the unit pixels; amplifying transistors each included in a corresponding one of the unit pixels and outputting the pixel signal; correlated double sampling units each provided for a corresponding one of the columns of the unit pixels and configured to perform correlated double sampling on a reset component of the pixel signal and on a data component including the reset component and a signal component of the pixel signal so as to sample the signal component; low-pass filters each (i) inserted in a corresponding one of the column signal lines between an output terminal of the amplifying transistor and the correlated double sampling unit or (ii) included in a corresponding one of the correlated double sampling units, and a reference signal generating unit configured to generate a reference signal having a ramp waveform, wherein each of the correlated double sampling units includes: a voltage comparator provided for a corresponding one of the columns; and a counter that counts a clock signal, the voltage comparator includes: a differential input unit including two transistors that receive the reference signal, and the pixel signal output from the amplifying transistor; and a load capacitor connected between output terminals of the differential input unit, the voltage comparator converts the pixel signal into a duration by comparing the pixel signal with the reference signal, the counter converts the duration into a digital signal, and the two transistors and the load capacitor function as the low-pass filter.