Quantization circuit, image sensor, and signal quantization method

The invention provides a quantization circuit, an image sensor and a signal quantization method. The quantization circuit comprises M comparators; m is an integer greater than or equal to 1; each comparator comprises a comparison module, an amplification module and a clamping module; the comparison module is used for comparing the input signal with the reference signal to obtain a comparison result, and outputting a first output voltage based on the comparison result; the amplification module obtains a second output voltage which is amplified and reversely output based on the first output voltage; the first end of the clamping module is connected with the first voltage source, the second end is connected with the output end of the amplification module, and the clamping module is used for adjusting the second output voltage to the preset potential when the second output voltage does not meet the preset potential. According to the invention, through the arrangement of the clamping module, boosting can be carrie