Patent ID: 6972984

Claim:
A ferroelectric memory device comprising: a plurality of word lines disposed to be mutually parallel; a plurality of bit lines disposed to be mutually parallel, intersecting the word lines; a plurality of ferroelectric memory cells disposed at intersections of the word lines and the bit lines; a word line drive section which drives the word lines; a bit line drive section which drives the bit lines; a selected-word-line-voltage-supply-line and an unselected-word-line-voltage-supply-line which are connected to the word line drive section; a selected-bit-line-voltage-supply-line and an unselected-bit-line-voltage-supply-line which are connected to the bit line drive section; a power circuit which generates a plurality of different voltages; a voltage selection circuit which selectively outputs the different voltages to the selected-word-line-voltage-supply-line, the unselected-word-line-voltage-supply-line, the selected-bit-line-voltage-supply-line, and the unselected-bit-line-voltage-supply-line; and a potential gradient correction section which reduces one of a first difference in potential gradient between the selected-word-line-voltage-supply-line and the unselected-bit-line-voltage-supply-line and a second difference in potential gradient between the selected-bit-line-voltage-supply-line and the unselected-word-line-voltage-supply-line, wherein the word line drive section and the bit line drive section apply a positive or negative selection voltage to a selected memory cell from among the ferroelectric memory cells and an unselection voltage to the remaining unselected memory cells, wherein, when either the positive or the negative selection voltage is applied to the selected memory cell, the voltage selection circuit fixes the potential of the unselected-word-line-voltage-supply-line in a case where the potential gradient correction section reduces the first difference in potential gradient, and fixes the potential of the unselected-bit-line-voltage-supply-line in a case where the potential gradient correction section reduces the second difference in potential gradient.