High-speed digital correlation dual-sampling circuit structure based on monoclinic ADC

• Main Authors: GAO JING, HENG JIAWEI, SHI ZAIFENG, NIE KAIMING, XU JIANGTAO
• Format: Patent
• Language: Chinese; English
• Published: 06.09.2019
• Subjects: ELECTRIC COMMUNICATION TECHNIQUE; ELECTRICITY; PICTORIAL COMMUNICATION, e.g. TELEVISION

The invention discloses a high-speed digital correlation double-sampling circuit structure based on a monoclinic ADC. The high-speed digital correlation double-sampling circuit structure comprises a comparator U1 and a comparator U2. The comparator U1 and the comparator U2 are used for executing A/D conversion operation. The comparator U1 is used for comparing a reset signal Vrst reset and outputby the pixel unit with a ramp signal Vramp formed by the ramp generator. The comparator U2 is used for comparing an exposure signal Vsig output after the exposure of the pixel unit is finished with the slope signal Vramp formed by the slope generator. Holding capacitors CH1 are respectively arranged between the comparator U1 and the pixel unit and between the comparator U2 and the pixel unit, andthe holding capacitors CH2 are respectively used for storing a reset signal Vrst and an exposure signal Vsig output by the pixel unit. According to the structure, the working frequency of the circuitcan be improved while the f