US 11,722,801 B1
Ramp settling assist circuit in local ramp buffer circuit
Hiroaki Ebihara, San Jose, CA (US); Zhenfu Tian, San Jose, CA (US); Tao Sun, San Jose, CA (US); Liang Zuo, Milpitas, CA (US); Yu-Shen Yang, San Jose, CA (US); Satoshi Sakurai, Cupertino, CA (US); and Rui Wang, San Jose, CA (US)
Assigned to OmniVision Technologies, Inc., Santa Clara, CA (US)
Filed by OMNIVISION TECHNOLOGIES, INC., Santa Clara, CA (US)
Filed on Apr. 13, 2022, as Appl. No. 17/659,042.
Int. Cl. H04N 25/75 (2023.01); H04N 25/772 (2023.01)
CPC H04N 25/75 (2023.01) [H04N 25/772 (2023.01)] 14 Claims
OG exemplary drawing
 
1. A ramp buffer circuit, comprising:
an input device having an input coupled to receive a ramp signal;
a bias current source coupled to an output of the input device, wherein the input device and the bias current source are coupled between a power line and ground; and
an assist current source coupled between the output of the input device and ground, wherein the assist current source is configured to conduct an assist current from the output of the input device to ground only during a ramp event generated in the ramp signal.