Solid-state imaging device and image capturing apparatus including the same

摘要

A solid-state imaging device including: a plurality of pixels which are on a same semiconductor substrate and each of which generates a pixel signal; a comparison circuit that is connected to the pixels in each of columns; a D/A conversion circuit that generates a comparison potential and provide the generated comparison potential in common to the comparison circuit in each column; and a D/A conversion circuit output unit provided in a common line for providing the comparison potential to the comparison circuit in each column, wherein the D/A conversion circuit output unit includes: a source follower circuit that is provided to the line and includes a first current source having a transistor, and an amplification transistor having a gate oxide film that is thinner than a gate oxide film of the transistor; and a voltage control circuit that controls a drain-to-source voltage of the amplification transistor.

主权项

1. A solid-state imaging device comprising:
a plurality of pixels which are arranged in rows and columns on a same semiconductor substrate and each of which generates a pixel signal according to an amount of received light; a comparison circuit that is connected in common to the pixels in each of the columns and compares the pixel signal to a comparison signal that is a comparison criterion; a comparison signal generating unit configured to generate the comparison signal and provide the comparison signal in common to the comparison circuit in each column; and a signal conditioning circuit provided in a common signal path for providing the comparison signal from the comparison signal generating unit to the comparison circuit in each column, wherein the signal conditioning circuit includes: a source follower circuit that is provided to the signal path and includes a first current source having a transistor, and an amplification transistor having a gate oxide film that is thinner than a gate oxide film of the transistor; and a voltage control circuit that controls a drain-to-source voltage of the amplification transistor.