US 11,895,420 B2
Ramp generator including emphasis circuit and pre-emphasis circuit, operation method thereof, and image sensor device including the ramp generator
Myeongjin Oh, Incheon (KR); Jaejung Park, Hwaseong-si (KR); Hyosang Kim, Yongin-si (KR); Sukho Shin, Suwon-si (KR); and Haneul Jung, Suwon-si (KR)
Assigned to Samsung Electronics Co., Ltd., Gyeonggi-do (KR)
Filed by Samsung Electronics Co., Ltd., Suwon-si (KR)
Filed on Apr. 12, 2022, as Appl. No. 17/718,450.
Claims priority of application No. 10-2021-0108797 (KR), filed on Aug. 18, 2021.
Prior Publication US 2023/0053956 A1, Feb. 23, 2023
Int. Cl. H04N 25/75 (2023.01); H04N 25/77 (2023.01); H04N 25/673 (2023.01)
CPC H04N 25/75 (2023.01) [H04N 25/673 (2023.01); H04N 25/77 (2023.01)] 20 Claims
OG exemplary drawing
 
1. A ramp generator, comprising:
a ramp circuit configured to receive a first ramp enable signal from a control circuit during a first ramp period, the first ramp period including a first reset period and a first sensing period, and the ramp circuit being configured to output a first ramp signal to a correlated double sample (CDS) circuit;
an emphasis circuit configured to increase a voltage level of the first ramp signal during the first reset period, based on a first enable signal received from the control circuit; and
a pre-emphasis circuit configured to further increase the voltage level of the first ramp signal during a first pre-emphasis period in the first reset period, based on a second enable signal received from the control circuit.