Rapid-response dynamic latch comparator

The invention discloses a rapid-response dynamic latch comparator which comprises a tail switch unit, a pre-amplification input unit, a pre-amplification reset unit, a latch input unit, a cross-coupling latch structure unit, a disconnecting switch unit, a latch reset unit and a positive feedback unit. The disconnecting switch unit is cut off in a reset phase, the grid potential of a PMOS transistor in the cross-coupling latch structure is ground GND under the effect of a latch input NMOS pair transistor, the grid potential of an NMOS transistor in the cross-coupling latch structure is VDD under the effect of a latch reset PMOS pair transistor, the cross-coupling latch structure establishes positive feedback rapidly in the comparison phase, and the speed of the comparator is improved. On the premise that power consumption is not increased, the disadvantage that time delay of a traditional double-tail dynamic latch comparator is increased rapidly with decrease of a differential input voltage, time delay of the