Semiconductor memory device and method of operating same
View Patent ↗There are many inventions described and illustrated herein. In a first aspect, the present invention is directed to a memory device and technique of reading data from and writing data into memory cells of the memory device. In this regard, in one embodiment of this aspect of the invention, the memory device and technique for operating that device that minimizes, reduces and/or eliminates the debilitating affects of the charge pumping phenomenon. This embodiment of the present invention employs control signals that minimize, reduce and/or eliminate transitions of the amplitudes and/or polarities. In another embodiment, the present invention is a semiconductor memory device including a memory array comprising a plurality of semiconductor dynamic random access memory cells arranged in a matrix of rows and columns. Each semiconductor dynamic random access memory cell includes a transistor having a source region, a drain region, a electrically floating body region disposed between and adjacent to the source region and the drain region, and a gate spaced apart from, and capacitively coupled to, the body region. Each transistor includes a first state representative of a first charge in the body region, and a second data state representative of a second charge in the body region. Further, each row of semiconductor dynamic random access memory cells includes an associated source line which is connected to only the semiconductor dynamic random access memory cells of the associated row.
1. A semiconductor memory array, comprising:
a plurality of dynamic random access memory cells arranged in a matrix of rows and columns, each dynamic random access memory cell includes at least one transistor having:
a first region;
a second region;
a body region disposed between the first region and the second region,
wherein the body region is electrically floating; and
a gate spaced apart from, and capacitively coupled to, the body region;
wherein each memory cell includes (1) a first data state which corresponds to a first charge in the body region of the transistor of the memory cell, and (2) a second data state which corresponds to a second charge in the body region of the transistor of the memory cell; and
wherein:
the first region of the transistor of each memory cell corresponding to a first row of dynamic random access memory cells is connected to a first source line,
the first region of the transistor of each memory cell corresponding to a second row of dynamic random access memory cells is connected to the first source line, and
the first region of the transistor of each memory cell corresponding to a third row of dynamic random access memory cells is connected to a second source line;
wherein the first row of memory cells is adjacent to both the second and third rows of memory cells; and
wherein the second region of the transistor of each memory cell of the first row of dynamic random access memory cells shares the second region with the transistor of an adjacent memory cell of the third row of dynamic random access memory cells.
2. The semiconductor memory array of claim 1 wherein the second region of the transistor of each memory cell of the first row of dynamic random access memory cells is connected to a bit line that is different from the bit line which is connected to the second region of the transistor of the adjacent memory cell of the second row of dynamic random access memory cells.
3. The sbmiconductor memory array of claim 1 wherein:
the gate of the transistor of each memory cell corresponding to the first row of dynamic random access memory cells is connected to a first word line;
the gate of the transistor of each memory cell corresponding to the second row of dynamic random access memory cells is connected to a second word line; and
the first word line and the second word line are connected.
4. The semiconductor memory array of claim 1 wherein memory cells of the first row of dynamic random access memory cells and the second row of dynamic random access memory cells are read from or written to simultaneously.
5. The semiconductor memory array of claim 1 wherein the semiconductor memory array is a portion of a logic device.
6. The semiconductor memory array of claim 1 wherein the semiconductor memory array is a portion of a memory device.
7. The semiconductor memory array of claim 1 wherein one or more predetermined memory cells of the first row of dynamic random access memory cells are programmed to the second data state by programming each memory cell of the first row of dynamic random access memory cells to the first data state and thereafter programming the one or more predetermined memory cells of the first row of dynamic random access memory cells to the second data state.
8. A semiconductor memory array, disposed in or on a semiconductor region or layer which resides on or above an insulating region or layer of a substrate, the semiconductor memory array, comprising:
a plurality of dynamic random access memory cells disposed in or on the semiconductor region or layer and arranged in a matrix of rows and columns, each dynamic random access memory cell includes at least one transistor having:
a first region;
a second region;
a body region disposed between the first region, the second region, and the insulating region or layer of the substrate, wherein the body region is electrically floating; and
a gate spaced apart from, and capacitively coupled to, the body region;
wherein each memory cell includes (1) a first data state which corresponds to a first charge in the body region of the transistor of the memory cell, and (2) a second data state which corresponds to a second charge in the body region of the transistor of the memory cell; and
wherein:
the first region of the transistor of each memory cell corresponding to a first row of dynamic random access memory cells is connected to a first source line,
the first region of the transistor of each memory cell corresponding to a second row of dynamic random access memory cells is connected to the first source line, and
the first region of the transistor of each memory cell corresponding to a third row of dynamic random access memory cells is connected to a second source line;
wherein the first row of memory cells is adjacent to both the second and third rows of memory cells; and
wherein the second region of the transistor of each memory cell of the first row of dynamic random access memory cells shares the second region with the transistor of an adjacent memory cell of the third row of dynamic random access memory cells.
9. The semiconductor memory array of claim 8 wherein the second region of the transistor of each memory cell of the first row of dynamic random access memory cells is connected to a bit line that is different from the bit line which is connected to the second region of the transistor of the adjacent memory cell of the second row of dynamic random access memory cells.
10. The semiconductor memory array of claim 8 wherein:
the gate of the transistor of each memory cell corresponding to the first row of dynamic random access memory cells is connected to a first word line;
the gate of the transistor of each memory cell corresponding to the second row of dynamic random access memory cells is connected to a second word line; and
the first word line and the second word line are connected.
11. The semiconductor memory array of claim 8 wherein memory cells of the first row of dynamic random access memory cells and the second row of dynamic random access memory cells are read from or written to simultaneously.
12. The semiconductor memory array of claim 8 wherein the semiconductor memory array is a portion of a logic device.
13. The semiconductor memory array of claim 8 wherein the semiconductor memory array is a portion of a memory device.
14. The semiconductor memory array of claim 8 wherein one or more predetermined memory cells of the first row of dynamic random access memory cells are programmed to the second data state by programming each memory cell of the first row of dynamic random access memory cells to the first data state and thereafter programming the one or more predetermined memory cells of the first row of dynamic random access memory cells to the second data state.
15. An integrated circuit device, comprising:
a memory cell array including a plurality of dynamic random access memory cells arranged in a matrix of rows and columns, each dynamic random access memory cell includes at least one transistor having:
a first region;
a second region;
a body region disposed between the first region and the second region,
wherein the body region is electrically floating; and
a gate spaced apart from, and coupled to, the body region;
wherein each memory cell includes a plurality of data states wherein each data state is representative of an amount of charge stored in the body region; and
wherein:
the first region of the transistor of each memory cell corresponding to a first row of dynamic random access memory cells is connected to a first source line,
the first region of the transistor of each memory cell corresponding to a second row of dynamic random access memory cells is connected to the first source line, and
the first region of the transistor of each memory cell corresponding to a third row of dynamic random access memory cells is connected to a second source line;
wherein the first row of memory cells is adjacent to both the second and third rows of memory cells;
wherein the second region of the transistor of each memory cell of the first row of dynamic random access memory cells shares the second region with the transistor of an adjacent memory cell of the third row of dynamic random access memory cells; and
wherein the second region of the transistor of each memory cell of the first row of dynamic random access memory cells is connected to a bit line that is different from the bit line which is connected to the second region of the transistor of the adjacent memory cell of the second row of dynamic random access memory cells.
16. The integrated circuit device of claim 15 wherein:
the gate of the transistor of each memory cell corresponding to the first row of dynamic random access memory cells is connected to a first word line;
the gate of the transistor of each memory cell corresponding to the second row of dynamic random access memory cells is connected to a second word line; and
the first word line and the second word line are connected.
17. The integrated circuit device of claim 15 wherein memory cells of the first row of dynamic random access memory cells and the second row of dynamic random access memory cells are read from or written to simultaneously.
18. The integrated circuit device of claim 15 wherein the integrated circuit device is a logic device or a memory device.
19. The integrated circuit device of claim 15 wherein one or more predetermined memory cells of the first row of dynamic random access memory cells are programmed to the second data state by programming each memory cell of the first row of dynamic random access memory cells to the first data state and thereafter programming the one or more predetermined memory cells of the first row of dynamic random access memory cells to the second data state.