Imaging element, imaging method and electronic apparatus
There is provided an imaging device including a pixel array section including pixel units two-dimensionally arranged in a matrix pattern, each pixel unit including a photoelectric converter, and a plurality of column signal lines disposed according to a first column of the pixel units. The imaging device further includes an analog to digital converter that is shared by the plurality of column signal lines.
1. An imaging device, comprising:
a plurality of pixels including a first pixel and a second pixel;
a first signal line coupled to the first pixel;
a second signal line coupled to the second pixel;
a comparator coupled to the first and the second signal lines, the comparator including;
a first differential pair unit including;
a first differential transistor coupled to the first signal line;
a second differential transistor coupled to a reference signal generation circuit;
a first select transistor coupled to the first differential transistor; and
a second select transistor coupled to the second differential transistor; and
a second differential pair unit including;
a third differential transistor coupled to the second signal line;
a fourth differential transistor coupled to the reference signal generation circuit;
a third select transistor coupled to the third differential transistor; and
a fourth select transistor coupled to the fourth differential transistor.
2. The imaging device of claim 1 , wherein the first and second differential pair units are provided in parallel as part of a differential pair circuit.
3. The imaging device of claim 2 , further comprising an amplification unit, wherein an output from the differential pair circuit is supplied to the amplification unit.
4. The imaging device of claim 2 , further comprising:
a first amplification unit, wherein the first amplification unit is an inverting amplification unit, wherein an output from the differential pair circuit is supplied to the amplification unit; and
a second amplification unit, wherein the second amplification unit receives an output from the first amplification unit.
5. The imaging device of claim 1 , wherein the first signal line is a first column signal line, and wherein the second signal line is a second column signal line.
6. The imaging device of claim 5 , wherein pixels in even numbered rows share the first column signal line, and wherein pixels in odd numbered rows share the second column signal line.
7. The imaging device of claim 1 , wherein the second differential transistor of the first differential pair unit is connected to the reference signal generation circuit by a first capacitor, and wherein the fourth differential transistor of the second differential pair unit is connected to the reference signal generation circuit by a second capacitor.
8. The imaging device of claim 7 , wherein the first and second capacitors are directly connected to an output node of the reference signal generation circuit.
9. The imaging device of claim 8 , further comprising: first and second switches, wherein the first differential pair unit is selectively connected to the first signal line by the first switch, and wherein the second differential pair unit is selectively connected to the second signal line by the second switch.
10. The imaging device of claim 1 , further comprising: first and second switches, wherein the first differential pair unit is selectively connected to the first signal line by the first switch, and wherein the second differential pair unit is selectively connected to the second signal line by the second switch.
11. An electronic apparatus, comprising:
an optical system including at least one lens; and
a device configured to receive light from the optical system, wherein the imaging includes:
a plurality of pixels including a first pixel and a second pixel;
a first signal line coupled to the first pixel;
a second signal line coupled to the second pixel;
a comparator coupled to the first and the second signal lines, the comparator including;
a first differential pair unit including;
a first differential transistor coupled to the first signal line;
a second differential transistor coupled to a reference signal generation circuit;
a first select transistor coupled to the first differential transistor; and
a second select transistor coupled to the second differential transistor; and
a second differential pair unit including; a third differential transistor coupled to the second signal line; a fourth differential transistor coupled to the reference signal generation circuit; a third select transistor coupled to the third differential transistor; and a fourth select transistor coupled to the fourth differential transistor.
12. The electronic apparatus of claim 11 , wherein the first and second differential pair units are provided in parallel as part of a differential pair circuit.
13. The electronic apparatus of claim 12 , further comprising an amplification unit, wherein an output from the differential pair circuit is supplied to the amplification unit.
14. The electronic apparatus of claim 12 , further comprising:
a first amplification unit, wherein the first amplification unit is an inverting amplification unit, wherein an output from the differential pair circuit is supplied to the amplification unit; and
a second amplification unit, wherein the second amplification unit receives an output from the first amplification unit.
15. The electronic apparatus of claim 11 , wherein the first signal line is a first column signal line, and wherein the second signal line is a second column signal line.
16. The electronic apparatus of claim 15 , wherein pixels in even numbered rows share the first column signal line, and wherein pixels in odd numbered rows share the second column signal line.
17. The electronic apparatus of claim 11 , wherein the second differential transistor of the first differential pair unit is connected to the reference signal generation circuit by a first capacitor, and wherein the fourth differential transistor of the second differential pair unit is connected to the reference signal generation circuit by a second capacitor.
18. The electronic apparatus of claim 17 , wherein the first and second capacitors are directly connected to an output node of the reference signal generation circuit.
19. The electronic apparatus of claim 18 , further comprising: first and second switches, wherein the first differential pair unit is selectively connected to the first signal line by the first switch, and wherein the second differential pair unit is selectively connected to the second signal line by the second switch.
20. The electronic apparatus of claim 11 , further comprising: first and second switches, wherein the first differential pair unit is selectively connected to the first signal line by the first switch, and wherein the second differential pair unit is selectively connected to the second signal line by the second switch.