US 12,452,560 B2
Image sensor including analog-to-digital converter and ramp voltage generator
Yu Jin Park, Icheon-si (KR); Soo Hwan Kim, Icheon-si (KR); Min Kyu Kim, Icheon-si (KR); and Kang Bong Seo, Icheon-si (KR)
Assigned to SK hynix Inc., Icheon-si (KR)
Filed by SK hynix Inc., Icheon-si (KR)
Filed on Jun. 23, 2023, as Appl. No. 18/340,673.
Claims priority of application No. 10-2022-0180922 (KR), filed on Dec. 21, 2022.
Prior Publication US 2024/0214705 A1, Jun. 27, 2024
Int. Cl. H04N 25/772 (2023.01); H04N 25/59 (2023.01); H04N 25/71 (2023.01)
CPC H04N 25/772 (2023.01) [H04N 25/59 (2023.01); H04N 25/745 (2023.01)] 18 Claims
OG exemplary drawing
 
1. An image sensor, comprising:
a pixel including a floating diffusion (FD) node having a first capacitance in a first mode and a second capacitance that is less than the first capacitance in a second mode;
an analog-to-digital converter (ADC) outputting a pixel value based on a ramp voltage and a pixel voltage output from the pixel; and
a ramp voltage generator controlling the ramp voltage based on a difference between a first pixel value output from the ADC in the first mode and a second pixel value output from the ADC in the second mode.