US 11,671,725 B2
Image sensing device adjusting comparison precondition for pixel signals
Won Seok Hwang, Gyeonggi-do (KR)
Assigned to SK hynix Inc., Gyeonggi-do (KR)
Filed by SK hynix Inc., Gyeonggi-do (KR)
Filed on Sep. 30, 2020, as Appl. No. 17/39,008.
Claims priority of application No. 10-2020-0053400 (KR), filed on May 4, 2020.
Prior Publication US 2021/0344857 A1, Nov. 4, 2021
Int. Cl. H04N 5/232 (2006.01); H04N 25/75 (2023.01); H04N 25/76 (2023.01); H04N 25/709 (2023.01)
CPC H04N 25/75 (2023.01) [H04N 25/709 (2023.01); H04N 25/76 (2023.01)] 15 Claims
OG exemplary drawing
 
1. An image sensing device comprising:
a first anterior comparator suitable for generating a first anterior comparison signal based on a first pixel signal and a ramp signal;
a first posterior comparator suitable for performing a first comparison that compares the first anterior comparison signal with a first reference signal under a first comparison precondition and generating a first posterior comparison signal corresponding to a result of the first comparison;
a second anterior comparator suitable for generating a second anterior comparison signal based on a second pixel signal and the ramp signal; and
a second posterior comparator suitable for performing a second comparison that compares the second anterior comparison signal with a second reference signal under a second comparison precondition different from the first comparison precondition, and suitable for generating a second posterior comparison signal corresponding to a result of the second comparison,
wherein the first posterior comparator includes:
an input circuit suitable for receiving the first anterior comparison signal and the first reference signal;
a loading circuit coupled between the input circuit and a first voltage terminal;
a first current source coupled between the input circuit and a second voltage terminal and suitable for generating a first current corresponding to a voltage level of the first reference signal; and
a second current source coupled between the input circuit and the second voltage terminal and suitable for generating a first adjusting current for adjusting the voltage level of the first reference signal based on a first control code signal.