Patent ID: 7009865
Filing Date: 2006-03-07
Classification: G11C

Abstract:
1. A non-volatile ferroelectric cell array circuit, comprising: a plurality of top sub cell arrays and a plurality of bottom sub cell arrays having a plurality of main bit lines and a plurality of sub bit lines by controlling an amount of a current supplied from a power voltage to the main bit line according to a sensing voltage of the sub bit line receiving a cell data; a main bit line sense amplifier disposed between the plurality of top sub cell arrays and the plurality of bottom sub cell arrays, for sensing and amplifying the sensing voltage of a top main bit line shared by the plurality of top sub cell arrays and the sensing voltage of a bottom main bit line shared by the plurality of bottom sub cell arrays according to a sensing signal; and word line drivers for selectively enabling word lines of the sub cell arrays for the read and write operation of the cell data, wherein each of the sub cell arrays comprises: a ferroelectric capacitor for storing the cell data, a first electrode of which being coupled to a word line; a PNPN diode coupled between a second electrode of the ferroelectric capacitor and the sub bit line in a backward direction, and turned on when a voltage of the sub bit line is higher than that of the second electrode by a predetermined level; and a PN diode coupled between the second electrode and the sub bit line in the forward direction, and turned on when the voltage of the second electrode is higher than that of the sub bit line by a predetermined level.