Analog-to-digital converter and readout circuit

• Main Authors: WANG DONGCHEN, REN GUANJING
• Format: Patent
• Language: Chinese; English
• Published: 18.08.2023
• Subjects: BASIC ELECTRONIC CIRCUITRY; CODE CONVERSION IN GENERAL; CODING; DECODING; ELECTRIC COMMUNICATION TECHNIQUE; ELECTRICITY; PICTORIAL COMMUNICATION, e.g. TELEVISION

The utility model provides an analog-to-digital converter and a reading circuit, the analog-to-digital converter comprises at least one column of analog-to-digital conversion units, and each analog-to-digital conversion unit comprises a pixel control module used for controlling pixel signal output in pre-comparison and quantization comparison stages; the ramp control module is used for controlling the output of a primary ramp signal in a quantitative comparison stage; the reference/adjustment module is used for controlling the output of the reference signal in the pre-comparison stage, and controlling whether the reference signal is output or not according to the pre-comparison result in the quantization comparison stage to adjust the primary ramp signal so as to obtain an ultimate ramp signal; the comparison module receives the pixel signal, the reference signal and the ultimate ramp signal, and is used for comparing the pixel signal with the reference signal to generate a pre-comparison result in a pre-comp