Apparatuses, circuits, and methods for biasing signal lines
Apparatuses, circuits, and methods are disclosed for biasing signal lines in a memory array. In one such example the memory array includes a signal line coupled to a plurality of memory cells and is configured to provide access to the plurality of memory cells responsive to a biasing condition of the signal line. The memory array also includes a signal line driver coupled to the signal line, the signal line driver configured to provide a biasing signal to the signal line and to provide a preemphasis in the biasing signal responsive to a control signal. The control signal is responsive to an operating condition.
1. An apparatus, comprising:
a memory array including a signal line coupled to a plurality of memory cells and configured to provide access to the plurality of memory cells responsive to a biasing condition of the signal line; and
a signal line driver coupled to the signal line, the signal line driver configured to provide a biasing signal to the signal line, wherein the biasing signal is preemphasized according to a model of the signal line as a concentrated or a distributed RC network.
2. The apparatus of claim 1 , further comprising:
a microcontroller coupled to the signal line driver, the microcontroller configured to control the signal line driver and calculate the biasing signal based at least in part on operating conditions of the memory array.
3. The apparatus of claim 2 wherein the microcontroller is configured to model the signal line as the concentrated or the distributed RC network to calculate the biasing signal.
4. The apparatus of claim 1 wherein the signal line comprises a word line and the signal driver is included in a row decoder.
5. An apparatus, comprising:
a memory array including a plurality of memory cells and a signal line coupled to the plurality of memory cells;
a signal line driver coupled to a signal line of a memory array, the signal line driver configured to provide a biasing signal to the signal line; and
a microcontroller coupled to the signal line driver, the microcontroller configured to control the signal line driver to preemphasize the biasing signal according to a model of the signal line as a concentrated or a distributed RC network.
6. The apparatus of claim 5 wherein the microcontroller is configured to calculate electrical parameters of the concentrated RC network or the distributed RC network.
7. The apparatus of claim 5 wherein the electrical parameters comprise a calculated resistance or a calculated capacitance.
8. The apparatus of claim 5 wherein the concentrated RC network comprises a lumped resistance-capacitance (RC) circuit.
9. The apparatus of claim 5 wherein the microcontroller is configured to calculate the biasing signal based at least in part on at least one operating condition of the memory array.
10. The apparatus of claim 9 wherein the at least one operating condition of the memory array is determined in an initial setup of the memory array.
11. The apparatus of claim 9 wherein the memory array is a cross-point array.
12. The apparatus of claim 9 , wherein the at least one operating condition comprises a power constraint of the memory array.
13. The apparatus of claim 12 , wherein the power constraint corresponds to at least one of a sleep mode, a low power mode, or an operation of the memory array in conjunction with a drained battery.
14. The apparatus of claim 9 , wherein a duration, magnitude, shape, or combinations thereof of the biasing signal is based on the at least one operating condition.
15. The apparatus of claim 9 , wherein the operating condition comprises multi-level of programming of at least two memory cells of the plurality of memory cells, the multi-level programming comprising a plurality of states for each level of the at least two memory cells.
16. The apparatus of claim 9 , wherein the operating condition comprises process variations of the memory array.
17. A method, comprising:
modeling a signal line as a concentrated or a distributed RC network, the signal line coupled to a plurality of memory cells; and
calculating a biasing signal based on the modeled signal line and at least one operating condition; and
preemphasizing the biasing signal based on the calculation of the biasing signal.
18. The method of claim 17 wherein calculating a biasing signal based on the modeled signal line and at least one operating condition comprises calculating the electrical parameters of the signal line, the electrical parameters comprising a calculated resistance or calculated capacitance.
19. The method of claim 17 further comprising:
providing the biasing signal to the signal line to preemphasize signal line during a memory operation.
20. The method of claim 19 wherein providing the biasing signal to the signal line comprises adaptively providing the biasing signal responsive to the at least one operating condition.