Resistive memory cell array with common plate
View Patent ↗In the present method of changing the state of a resistive memory device which is capable of adopting an erased, relatively higher resistance state and a programmed, relatively lower resistance state, the resistive memory device having first and second electrodes and an active layer between the first and second electrodes, an electrical potential is applied across the electrodes and current through the resistive memory device is limited by means of a first current limiting structure to change the resistive memory device from the erased, higher resistance state to the programmed, lower resistance state. Furthermore, an electrical potential is applied across the electrodes and current through the resistive memory device is limited by means of a second current limiting structure to change the resistive memory device from the programmed, lower resistance state to the erased, higher resistance state.
1. A memory structure comprising:
a resistive memory device;
a transistor;
a word line connected to the gate of the transistor;
a bit line;
one terminal of the transistor being connected to the resistive memory device, the other terminal of the transistor being connected to the bit line; and
first and second current source/limiting structures connected to the bit line.
2. The memory structure of claim 1 and further comprising a sense amplifier connected to the bit line.
3. A memory array comprising:
a plurality of word lines;
a plurality of bit lines;
a plurality of memory structures, each comprising a transistor and a resistive memory device, the resistive memory device comprising first and second electrodes and an active layer between the first and second electrodes, one terminal of the transistor being connected to a bit line, the other terminal of the transistor being connected to the first electrode of the resistive memory device, the gate of the transistor being connected to a word line, the second electrodes of the resistive memory devices being connected in common, wherein first and second current source/limiting structures are connected to each bit line.
4. The memory device of claim 3 wherein the second electrodes are connected by means of a common plate.
5. The memory device of claim 4 wherein the second electrodes are part of the common plate.
6. A memory device comprising:
a substrate;
a common plate over the substrate;
a plurality of resistive memory devices over the substrate, wherein the common plate makes part of each of the resistive memory devices; and
a bit line overlying the substrate, the common plate overlying the bit line, wherein first and second current source/limiting structures are connected to the bit line.
7. The memory device of claim 6 and further comprising a transistor comprising a source and a drain in the substrate, and a gate, the common plate overlying the transistor.
8. The memory device of claim 7 wherein the transistor is in operative association with a resistive memory device.
9. The memory device of claim 8 wherein the gate of the transistor is a word line, the common plate overlying the word line.
10. The memory device of claim 3 and further comprising a sense amplifier communicatively coupled to each bit line.
11. The memory device of claim 6 and further comprising a sense amplifier communicatively coupled to the bit line.
12. The memory device of claim 6 wherein an electrode of each resistive memory device is connected by means of the common plate.
13. The memory device of claim 12 wherein the electrode of each resistive memory device is part of the common plate.