Differential amplifier, semiconductor device, and offset cancellation method

The embodiment of the invention relates to a differential amplifier, a semiconductor device and an offset cancellation method. While the influence of the offset voltage of the differential amplifier is suppressed, the speed of data reading is increased. The differential amplifier includes: a current source connected to a first power source in which a current can be supplied as a first current; an active element pair connected to the current source and amplifying a signal input to the input terminal pair to output an output signal pair; a pair of load elements connected to a second power source having a power source voltage different from that of the first power source, the pair of load elements for outputting the pair of output signals to the pair of output terminals; and a capacitive element pair inserted between the external input terminal pair and the input terminal pair; a switching element pair that generates a voltage by charging the pair of capacitive elements by short-circuiting corresponding terminal