| 摘要 |
Included are reference cells each including a variable resistance element which reversibly changes between a predetermined low resistance state LR and a predetermined high resistance state HR according to an application of an electric signal, a comparator which compares resistance values of the reference cells, a pulse generation circuit which generates an electric signal for setting the reference cells to LR or HR, and a control circuit which controls operations where application of the generated electric signal to one of the reference cells corresponding to a comparison result of the comparator and application of a new electric signal generated by the pulse generation circuit to one of the reference cells corresponding to a new comparison result of the comparator are repeated, and then one of the reference cells corresponding to a final comparison result of the comparator is connected to an output terminal.
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