Granted Patent B2

US 7,145,824 · App. 11/086,884 · Granted Dec 5, 2006

Abstract

Claims (34)

1. A thin film diode voltage tracking system, comprising:

an array core comprising a thin film diode in series with a nanoscale resistive memory cell, the nanoscale resistive memory cell having a controllably conductive media between a first electrode and a second electrode;

a temperature sensitive bias circuit to generate a reference temperature compensating bias voltage during an array core operation; and

a differential amplifier to supply the reference temperature compensating bias voltage to the nanoscale resistive memory cell.

2. The system of claim 1 , wherein the array core operation comprises one of a read operation, an erase operation, and a program operation.

3. The system of claim 1 , further comprising a sensing circuit to supply an array core operation voltage to the array core.

4. The system of claim 1 , wherein the temperature sensitive bias circuit comprises a thin film diode in series with a first resistor and a second resistor.

5. The system of claim 4 , wherein the thin film diode of the temperature sensitive bias circuit tracks a threshold voltage variance of the thin film diode of the array core.

6. The system of claim 5 , wherein the threshold voltage variance comprises a decrease in a threshold voltage of the thin film diode of the array core as ambient temperature increases.

7. The system of claim 4 , wherein the first resistor comprises a negative temperature coefficient and the second resistor comprises a positive temperature coefficient to create a resistive ratio to mimic temperature effects on the nanoscale resistive memory cell of the array core.

8. The system of claim 1 , wherein the reference temperature compensating bias voltage effects a constant operation voltage on the nanoscale resistive memory cell of the array core.

9. A diode threshold voltage variance compensation method, comprising:

utilizing a sensing circuit to supply a read operation voltage to an array core, the array core comprising a thin film diode in series with a nanoscale resistive memory cell, the nanoscale resistive memory cell having a controllably conductive media between a first electrode and a second electrode;

tracking a threshold voltage variance of the thin film diode of the array core during a read operation of the array core;

generating a temperature compensating bias voltage based on the threshold voltage variance by a temperature sensitive bias circuit; and

applying the temperature compensating bias voltage to the nanoscale resistive memory cell of the array core to maintain a constant read operation voltage level across the nanoscale resistive memory cell.

10. The method of claim 9 , wherein the threshold voltage variance comprises a decrease in voltage variance as ambient temperature increases.

11. The method of claim 9 , wherein tracking a threshold voltage variance comprises utilizing a thin film diode in series with a first resistor and a second resistor to form the temperature sensitive bias circuit.

12. The method of claim 11 , wherein the first resistor comprises a negative temperature coefficient and the second resistor comprises a positive temperature coefficient.

13. The method of claim 12 , wherein the negative temperature coefficient and the positive temperature coefficient create a resistive ratio to mimic temperature effects experienced by the nanoscale resistive memory cell of the array core.

14. The method of claim 9 , wherein applying the temperature compensating bias voltage to the nanoscale resistive memory cell comprises utilizing a differential amplifier.

15. A threshold voltage variance compensation system, comprising:

means for utilizing a sensing circuit to supply a read operation voltage to an array core, the array core comprising a thin film diode in series with a nanoscale resistive memory cell, the nanoscale resistive memory cell having a controllably conductive media between a first electrode and a second electrode;

means for tracking a threshold voltage variance of the thin film diode of the array core during a read operation of the array core;

means for generating a temperature compensating bias voltage based on the threshold voltage variance by a temperature sensitive bias circuit; and

means for applying the temperature compensating bias voltage to the nanoscale resistive memory cell of the array core for maintaining a constant read operation voltage level across the nanoscale resistive memory cell.

16. A memory cell operation voltage system, comprising:

a sensing circuit to provide an operation voltage to a memory array, the memory array comprising at least one first temperature variable select device in series with a nanoscale resistive memory cell, the nanoscale resistive memory cell having a controllably conductive media between a first electrode and a second electrode;

a reference circuit to produce a reference temperature compensating bias voltage to maintain a constant operation voltage level within the nanoscale resistive memory cell; and

a differential amplifier to duplicate the reference temperature compensating bias voltage to the nanoscale resistive memory cell of the memory array.

17. The system of claim 16 , wherein the reference circuit comprises a first resistor having a negative temperature coefficient and a second resistor having a positive temperature coefficient to create a resistive ratio.

18. The system of claim 17 , further comprising a second temperature variable select device to track threshold voltage fluctuation of the at least one first temperature variable select device of the memory array, the second temperature variable select device in series with the first resistor and the second resistor, the second temperature variable select device comprising the same type as the at least one first temperature variable select device of the memory array.

19. The system of claim 17 , wherein the resistive ratio of the reference circuit comprises a capability to mimic the effect of temperature variations on the nanoscale resistive memory cell of the memory array.

20. The system of claim 18 , the threshold voltage fluctuation comprises a decrease in threshold voltage as ambient temperature increases.

Assignments (8)