Comparator circuitry for use in a comparator to capture differences between magnitudes of a pair of comparator input signals in a series of capture operations defined by a reset signal, the circuitry comprising: latch circuitry, comprising a pair of latch input transistors which form corresponding parts of first and second current paths of the latch circuitry respectively, which current paths extend in parallel between high and low voltage sources, a pair of latch output nodes at corresponding positions along the first and second current paths of the latch circuitry respectively, and timing circuitry; and gain-stage circuitry, comprising a pair of cross-coupled gain-stage output transistors connected along respective first and second current paths of the gain-stage circuitry which extend in parallel between high and low voltage sources, and a pair of diode-connected gain-stage output transistors connected in parallel with the pair of cross-coupled gain-stage output transistors, respectively.