Patent ID: 9628737
Date: 2017-04-18
CPC Classifications: H01L,H04N

Claim:
1. A solid-state imaging device in which a first substrate and a second substrate having circuit elements, which constitute pixels, arranged thereon are electrically connected to each other, wherein each pixel includes: a photoelectric conversion unit that is disposed on the first substrate and outputs a signal based on incident light; a sampling transistor that is disposed on the second substrate, includes a gate terminal, a source terminal, and a drain terminal, samples and holds the signal input from the photoelectric conversion unit to a first terminal which is one of the source terminal or the drain terminal, and outputs the sampled and held signal from a second terminal which is the other of the source terminal or the drain terminal; a capacitor that is disposed on the second substrate and stores the signal output from the second terminal; a potential fixing circuit that fixes a potential of the first terminal to a potential based on a predetermined fixed potential during a readout period in which the signal stored in the capacitor is read out; and wherein each pixel further includes: an amplification transistor that is disposed on the first substrate, includes a second gate terminal to which a signal output from the photoelectric conversion unit is input, a second source terminal, and a second drain terminal, amplifies the signal input to the second gate terminal, and outputs the amplified signal from one of the second source terminal or the second drain terminal; and a current source that is disposed on the first substrate or the second substrate and includes a first end, which is connected to either of the second source terminal or the second drain terminal of the amplification transistor, and a second end, and wherein the fixed potential is input to the second end of the current source during the readout period and consequently the first end and the second end have substantially the same potential.