Dynamic comparator and method for offset calibration of analog-to-digital converter

The invention belongs to the field of analog integrated circuits, and particularly relates to a dynamic comparator and method for offset calibration of an analog-to-digital converter, and the dynamiccomparator comprises a first-stage preamplifier, a second-stage preamplifier, a third-stage preamplifier, a fourth-stage preamplifier and a latch which are connected in sequence. The input end of thefirst-stage preamplifier is connected with an input signal switch and a first switch, and the output end of the first-stage preamplifier is connected with the upper-stage plate of a first calibrationcapacitor; the input end of the second-stage preamplifier is connected with a second switch and the lower-stage plate of the first calibration capacitor, and the output end of the second-stage preamplifier is connected with the upper-stage plate of a second calibration capacitor; the input end of the three-stage pre-amplifier is connected with the third switch and the lower-stage plate of the second calibration capacitor, a