Comparator and analog/digital converter

An A/D converter comprising:

• a plurality of comparators, to which an input voltage signal, a reference voltage signal to be compared with the input voltage signal, and a clock signal are inputted, adapted to output a comparison result between the input voltage signal and the reference voltage signal;
• and
• an encoder adapted to output a digital signal corresponding to the input voltage signal based on the comparison result outputted from the plurality of comparators,
• wherein the comparators comprises:
• a dynamic differential amplifier circuit section adapted to operate, based on the clock signal, to output a first output voltage signal and a second output voltage signal and further, when the clock signal is in a first state, to cut off through-current and pre-charge the voltage values of the first and second output voltage signals to a predetermined voltage value;
• and, when the clock signal is in a second state, to change the voltage values of the first and second output voltage signals in the same direction at the same timing and generate a voltage difference between the voltage value of the first output voltage signal and the voltage value of the second output voltage signal without causing through-current to flow, wherein the first output voltage signal and the second output voltage signal respectively correspond to the value of the input voltage signal and the value of the reference voltage signal and are amplified, and
• a differential latch circuit section adapted to operate, based on the first output voltage signal and the second output voltage signal, to keep and output the comparison result between the input voltage signal and the reference voltage signal, without requiring a clock signal.