Samsung Electronics Co., Ltd.

Dongguk University Industry-academic Cooperation Foundation

Yeon-Seong Hwang

Min-Kyu Song

Jae-Jung Park

Dae-Yun Kim

Provided are a ramp signal calibration apparatus and method and image sensor including the apparatus. The apparatus includes: an analog-to-digital converter (ADC) including a trimmable transistor having a gain value that varies according to stored data, and configured to receive a ramp signal in a state where the gain value is a first gain value, and to output first and second output signals; a subtractor configured to calculate a difference between the first and second output signals; a digital comparator configured to compare the difference with a reference value and to determine whether a slope of the ramp signal has changed; and a counter configured to change the stored data based on whether the slope of the ramp signal has changed, wherein when the counter changes the data, the first gain value of the trimmable transistor is changed to a second gain value according to the changed data.

Growing community of inventors

Incheon, South Korea

Yeon-Seong Hwang