Power reduction for a sensing operation of a memory cell
Methods, systems, and devices for operating a ferroelectric memory cell or cells are described. A memory device may leverage non-volatile memory properties of a ferroelectric capacitor—e.g., that a ferroelectric capacitor may remain polarized at one of two states without a voltage applied across the ferroelectric capacitor—to activate a subset of sensing components corresponding to multiple memory cells with a common word line. For example, a first and second set of memory cells with a common word like may be selected for a read operation. A first set of sensing components corresponding to the first set of memory cells may be activated for the read operation, and a second set of sensing components that correspond to the second set of memory cells may be maintained in a deactivated state.
1. A method of operating a ferroelectric memory array, comprising:
selecting a first memory cell and a second memory cell for a read operation, wherein each of the first memory cell and the second memory cell comprises a ferroelectric capacitor;
activating a first sense component coupled with the first memory cell for the read operation; and
maintaining a second sense component coupled with the second memory cell in a deactivated state during the read operation.
2. The method of claim 1 , further comprising:
shorting a digit line of the second memory cell with a plate line during the read operation, wherein the plate line is coupled with the first memory cell, or the second memory cell, or both.
3. The method of claim 2 , wherein shorting the digit line comprises:
activating a switching component between the second memory cell and the plate line during the read operation.
4. The method of claim 2 , wherein a voltage of the plate line is a fixed voltage.
5. The method of claim 1 , further comprising:
isolating, using a selection component, a digit line of the first memory cell from a plate line during the read operation.
6. The method of claim 5 , wherein isolating the digit line of the first memory cell comprises:
deactivating a switching component between the first memory cell and the plate line during the read operation.
7. The method of claim 1 , further comprising:
selecting a third memory cell and a fourth memory cell using a word line coupled with the third memory cell and the fourth memory cell.
8. A memory device, comprising:
a first memory cell coupled with a first sense component;
a second memory cell coupled with a second sense component, wherein each of the first memory cell and the second memory cell comprises a ferroelectric capacitor; and
a controller coupled with the first sense component and the second sense component, wherein the controller is operable to activate the first sense component and the second sense component independently of one another.
9. The memory device of claim 8 , wherein the controller comprises:
a first driver that is coupled with the first sense component; and
a second driver that is coupled with the second sense component.
10. The memory device of claim 8 , wherein the first sense component is coupled with the controller via a first control line, and wherein the second sense component is coupled with the controller via a second control line, wherein the second control line is different than the first control line.
11. The memory device of claim 8 , further comprising:
a plate line coupled with each of the first memory cell and the second memory cell;
a first switching component coupled with a digit line corresponding to the first memory cell and the plate line; and
a second switching component coupled with a digit line corresponding to the second memory cell and the plate line.
12. The memory device of claim 11 , wherein each of the first switching component and the second switching component are coupled with a common voltage source.
13. The memory device of claim 8 , further comprising:
a third memory cell coupled with a third sense component;
a fourth memory cell coupled with a fourth sense component,
wherein the controller is coupled with the third sense component and the fourth sense component, the controller operable to activate the first sense component, the second sense component, the third sense component, and the fourth sense component independently of one another.
14. A memory device, comprising:
a first memory cell;
a second memory cell;
a first sense component;
a second sense component; and
a controller coupled with the first memory cell, the second memory cell, the first sense component, and the second sense component, wherein the controller is operable to:
select the first memory cell and the second memory cell for a read operation;
activate the first sense component corresponding to the first memory cell for the read operation; and
maintain the second sense component corresponding to the second memory cell in a deactivated state during the read operation.
15. The memory device of claim 14 , further comprising a first driver and a second driver,
wherein the first driver is operable to short a digit line of the second memory cell with a plate line during the read operation, wherein the plate line corresponds to the first memory cell and the second memory cell, and
wherein the second driver is operable to isolate a digit line of the first memory cell from the plate line during the read operation.
16. The memory device of claim 14 , further comprising:
a first switching component; and
a digit line corresponding to the first memory cell that is coupled with a plate line via the first switching component, wherein the controller is operable to activate the first switching component during the read operation.
17. The memory device of claim 14 , further comprising:
a second switching component; and
a digit line corresponding to the second memory cell that is coupled with a plate line via the second switching component, wherein the controller is operable to deactivate the second switching component during the read operation.
18. The memory device of claim 14 , further comprising:
a third memory cell; and
a fourth memory cell, wherein the controller is operable to select the third memory cell and the fourth memory cell for the read operation.
19. The memory device of claim 18 , further comprising:
a third sense component corresponding to the third memory cell, wherein the controller is operable to activate the third sense component for the read operation.
20. The memory device of claim 19 , further comprising:
a fourth sense component corresponding to the fourth memory cell, wherein the controller is operable to deactivate the fourth sense component for the read operation.