| 摘要 |
An image sensor and a column analog-to-digital converter thereof are provided. The column analog-to-digital converter includes a counter providing a counter result, a ramp signal generator providing a ramp signal and a start signal, a sampling and comparing array, a first latch array, a second latch array, and an arithmetic unit. The sampling and comparing array outputs a plurality of brightness transformation signals according to the ramp signal, the start signal, and initial voltages and brightness voltages of a plurality of photosensitive pixels. The first and the second latch arrays latch the counter result in response to the brightness transformation signals and output a plurality of first brightness latch values during a first period and a plurality of second brightness latch values during a second period. The arithmetic unit calculates the brightness values of the photosensitive pixels according to the first brightness latch values and the second brightness latch values. |
