Circuitry for and method of improving statistical distribution of integrated circuits
View Patent ↗An integrated circuit device comprising a memory cell array including a plurality of memory cells wherein each memory cell includes at least one electrically floating body transistor having source, drain and a body regions, wherein the body region is electrically floating and disposed between the source and drain regions; a gate is disposed over the body region. Each memory cell includes a first data state representative of a first charge in the body region and a second data state representative of a second charge in the body region. The integrated circuit device further includes operating characteristics adjustment circuitry, coupled to the memory cell array, to adjust one or more operating or response characteristics of one or more memory cells to improve the uniformity of operation/response characteristics of the memory cells of the memory cell array relative to the other memory cells of the array.
1. An integrated circuit device comprising:
a memory cell array including a plurality of memory cells wherein each memory cell includes at least one electrically floating body transistor having:
a source region;
a drain region;
a body region disposed between the source region and the drain region, wherein the body region is electrically floating; and
a gate disposed over the body region and separated therefrom by a gate dielectric; and
wherein the memory cell includes:
a first data state representative of a first charge in the body region; and
a second data state representative of a second charge in the body region; and
wherein each memory cell includes one or more operating or response characteristics and wherein the plurality of memory cells includes variations in operating or response characteristics; and
operating characteristics adjustment circuitry, coupled to the memory cell array, to generate one or more signals to responsively adjust one or more operating or response characteristics of at least one predetermined memory cell of the plurality of memory cells, wherein the adjusted one or more operating or response characteristics of the at least one predetermined memory cell reduces a statistical variation of the operating or response characteristics of the plurality of memory cells of the memory cell array.
2. The integrated circuit device of claim 1 wherein the one or more signals include a bias applied to one or more of the word line, source line and/or bit line associated with the at least one predetermined memory cells.
3. The integrated circuit device of claim 1 wherein the one or more signals provide a threshold voltage shift in the at least one predetermined memory cells.
4. The integrated circuit device of claim 1 wherein the one or more signals adjust the reference voltage applied to the sense amplifier which is associated with the at least one predetermined memory cells.
5. The integrated circuit device of claim 1 further including control logic, coupled to the operating characteristics adjustment circuitry, to control the operating characteristics adjustment circuitry.
6. A system comprising:
a first integrated circuit device including memory cell array including a plurality of memory cells wherein each memory cell includes at least one electrically floating body transistor having:
a source region;
a drain region;
a body region disposed between the source region and the drain region, wherein the body region is electrically floating; and
a gate disposed over the body region and separated therefrom by a gate dielectric; and
wherein each memory cell includes:
a first data state representative of a first charge in the body region; and
a second data state representative of a second charge in the body region; and
wherein each memory cell includes one or more operating or response characteristics and wherein the plurality of memory cells includes variations in operating or response characteristics; and
operating characteristics adjustment circuitry, coupled to the memory cell array, to generate one or more signals to responsively adjust one or more operating or response characteristics of at least one predetermined memory cell of the plurality of memory cells, wherein the adjusted one or more operating or response characteristics of the at least one predetermined memory cell reduces a statistical variation of the operating or response characteristics of the plurality of memory cells of the memory cell array;
a bus; and
a second integrated circuit device including control logic, coupled to the operating characteristics adjustment circuitry via the bus, to control the operating characteristics adjustment circuitry.
7. The system of claim 6 wherein the one or more signals include a bias applied to one or more of the word line, source line and/or bit line associated with the at least one predetermined memory cells.
8. The system of claim 6 wherein the one or more signals provide a threshold voltage shift in the at least one predetermined memory cells.
9. The system of claim 6 wherein the one or more signals adjust the reference voltage applied to the sense amplifier which is associated with the at least one predetermined memory cell.
10. The system of claim 6 wherein the operating characteristics adjustment circuitry applies the one or more signals when the first integrated circuit device is in operation or deployed in the field.
11. A method of operating an integrated circuit device comprising a memory cell array including a plurality of memory cells, each memory cell having one or more operating or response characteristics and wherein the plurality of memory cells includes variations in operating or response characteristics, the method comprising:
applying control signals to the memory cells, via associated word, source and/or bit lines, to read the data state of the memory cells; and
applying a bias voltage to the word line, source line and/or bit line associated with the at least one predetermined memory cells to responsively adjust one or more operating or response characteristics of the at least one predetermined memory cell of the plurality of memory cells, wherein the adjusted one or more operating or response characteristics of the at least one predetermined memory cells reduces a statistical variation of the operating or response characteristics of the plurality of memory cells of the memory array.
12. The method of claim 11 wherein each memory cell includes at least one electrically floating body transistor having a source region, a drain region, a body region disposed between the source region and the drain region, wherein the body region is electrically floating and a gate disposed over the body region and separated therefrom by a gate dielectric, and wherein the memory cell includes a first data state representative of a first charge in the body region, and a second data state representative of a second charge in the body region, the method further comprising:
applying one or more signals to provide a threshold voltage shift in the at least one predetermined memory cell.
13. The method of claim 11 wherein each memory cell includes a floating gate, the method further comprising:
adjusting the floating gate charge for the at least one predetermined memory cell.
14. The method of claim 11 wherein applying a bias voltage to the word line, source line and/or bit line associated with the at least one memory cell to responsively adjust one or more operating or response characteristics of the at least one predetermined memory cell includes applying the bias voltage when the integrated circuit device is in operation or deployed in the field.
15. The method of claim 11 further including determining the at least one predetermined memory cell when the integrated circuit device is in operation or deployed in the field.
16. The method of claim 11 further including determining the at least one predetermined memory cell when the integrated circuit device during test.
17. The method of claim 11 further including receiving a control signal wherein, in response, the operating characteristics adjustment circuitry applies the bias voltage to the word line, source line and/or bit line associated with the at least one predetermined memory cell to responsively adjust one or more operating or response characteristics of the at least one predetermined memory cell.
18. The method of claim 17 wherein the bias voltage is determined using a look-up table and/or a predetermined or mathematical relationship.
19. The method of claim 11 further including generating a control signal and providing the control signal to the operating characteristics adjustment circuitry wherein, in response, the operating characteristics adjustment circuitry applies the bias voltage to the word line, source line and/or bit line associated with the at least one predetermined memory cell to responsively adjust one or more operating or response characteristics of the at least one predetermined memory cell.
20. The method of claim 19 wherein the bias voltage is determined using a look-up table and/or a predetermined or mathematical relationship.