Flash adc with interpolators

An analog-to-digital converter, comprising:

• a plurality of pre-amplifiers, each providing a pair of differential outputs according to a pair of differential analog signals and a first reference voltage and a second reference voltage, wherein the first reference voltage corresponding to one of the differential analog signals is different from the second reference voltage corresponding to another of the differential analog signals;
• a plurality of dynamic comparators coupled to the pre-amplifiers, each providing a first comparing signal and a second comparing signal according to the pair of differential outputs of the corresponding pre-amplifier;
• a plurality of interpolators, each providing an interpolating signal according to the first and second comparing signals of two of the dynamic comparators;
• and
• an encoder, providing a digital output according to the interpolating signals,
• wherein when one of the differential analog signals is between the first reference voltages corresponding to two adjacent pre-amplifiers, the first comparing signals of the dynamic comparators corresponding to the two adjacent pre-amplifiers are complementary,
• wherein when each of the differential analog signals is not between the first reference voltages corresponding to the two adjacent pre-amplifiers, the first comparing signals of the dynamic comparators corresponding to the two adjacent pre-amplifiers are equal.