System and method of adaptive voltage scaling

• US 8,984,308 B2
• Filed: 12/03/2012
• Issued: 03/17/2015
• Est. Priority Date: 12/03/2012
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Krishnappa, Madan
• Primary Examiner(s): CONNOLLY, MARK A
• Application Number:
  US13/692,735
• Publication Number:
  US 20140157007A1
• Time in Patent Office: 834 Days
• Field of Search: 713/300, 327/540
• US Class Current: 713/300
• CPC Class Codes: G06F 1/28 Supervision thereof, e.g. detecting power-supply failure by out of limits supervision
• CPC Class Codes: G06F 1/3296 by lowering the supply or operating voltage
• CPC Class Codes: H02J 4/00 Circuit arrangements for mains or distribution networks not specified as ac or dc
• CPC Class Codes: Y02D 10/00 Energy efficient computing, e.g. low power processors, power management or thermal management

Abstract

A particular method includes, prior to issuing a recommendation by an adaptive voltage scaling (AVS) system, performing a first iteration of an AVS operation to sample characteristics of a semiconductor device to determine a first adjustment recommendation. The method further includes performing at least one additional iteration of the AVS operation to determine at least one additional adjustment iteration. When a threshold number of consecutive adjustment recommendations are consistent, the method includes issuing the recommendation by the AVS system.

Claims

1. A method comprising:

prior to issuing a recommendation by an adaptive voltage scaling (AVS) system;

performing a first iteration of an AVS operation to sample characteristics of a semiconductor device to determine a first adjustment recommendation; and

performing at least one additional iteration of the AVS operation to determine at least one additional adjustment recommendation; and

in response to the first adjustment recommendation and each of the at least one additional adjustment recommendations being consistent, issuing the recommendation by the AVS system.

2. The method of claim 1, wherein the recommendation is issued in response to the first adjustment recommendation and each of the at least one additional adjustment recommendations corresponding to a voltage increase.

3. The method of claim 1, wherein the recommendation is issued in response to the first adjustment recommendation and each of the at least one additional adjustment recommendations corresponding to a voltage decrease.

4. The method of claim 1, wherein the recommendation is issued in response to a threshold number of consecutive iterations having consistent adjustment recommendations, wherein the threshold number is a programmable integer value greater than one.

5. The method of claim 1, wherein a time interval between iterations is programmable.

6. The method of claim 1, wherein the AVS operation is performed by an AVS system that includes multiple sensors coupled to an AVS controller.

7. The method of claim 6, wherein the AVS system is programmable to select between sampling techniques including serial sensor sampling and parallel sensor sampling and to perform a selected sampling technique during each iteration.

8. The method of claim 1, wherein the recommendation is issued to a voltage regulator.

9. The method of claim 8, wherein the AVS operation is performed by an AVS system on a first die, and wherein the voltage regulator is implemented at a power management integrated circuit (PMIC) on a second die that is distinct from the first die.

10. The method of claim 9, wherein a time interval between iterations of the AVS operation is longer than a transient of a power change of the PMIC.

11. The method of claim 9, wherein multiple AVS systems are implemented on the first die.

12. The method of claim 1, wherein the first adjustment recommendation and the at least one additional adjustment recommendation are based on at least one of:

an operating condition of the semiconductor device, a temperature of the semiconductor device, or a performance of the semiconductor device.

13. An apparatus comprising:

an adaptive voltage scaling (AVS) system comprising;

multiple sensors configured to sample characteristics of a semiconductor device; and

a controller coupled to the sensors and configured to determine an adjustment recommendation for each iteration of an AVS operation that includes sampling the characteristics,

wherein the controller is further configured to issue a recommendation in response to a threshold number of consecutive adjustment recommendations being consistent.

14. The apparatus of claim 13, wherein the recommendation is issued in response to the threshold number of consecutive adjustment recommendations indicating a voltage increase.

15. The apparatus of claim 13, wherein the recommendation is issued in response to the threshold number of consecutive adjustment recommendations indicating a voltage decrease.

16. The apparatus of claim 13, wherein the threshold number is a programmable integer value greater than one.

17. The apparatus of claim 13, wherein a time interval between iterations of the AVS operation is programmable.

18. The apparatus of claim 13, wherein the controller is programmable to select between sampling techniques including serial sensor sampling and parallel sensor sampling and to perform a selected sampling technique during each iteration.

19. The apparatus of claim 13, further comprising a voltage regulator, wherein the recommendation is issued to the voltage regulator.

20. The apparatus of claim 19, wherein the AVS system is implemented on a first die, and wherein the voltage regulator is implemented at a power management integrated circuit (PMIC) on a second die that is distinct from the first die.

21. The apparatus of claim 20, wherein a time interval between iterations of the AVS operation is longer than a transient of a power change of the PMIC.

22. The apparatus of claim 20, further comprising at least one additional AVS system implemented on the first die.

23. The apparatus of claim 13, wherein the adjustment recommendation is based on at least one of:

an operating condition of the semiconductor device, a temperature of the semiconductor device, or a performance of the semiconductor device.

24. An apparatus comprising:

means for sampling characteristics of a semiconductor device;

means for determining an adjustment recommendation for each iteration of an adaptive voltage scaling (AVS) operation that includes sampling the characteristics; and

means for issuing a recommendation in response to a threshold number of consecutive adjustment recommendations being consistent.

25. The apparatus of claim 24, wherein the recommendation is issued in response to the threshold number of consecutive adjustment recommendations indicating a voltage increase.

26. The apparatus of claim 24, wherein the recommendation is issued in response to the threshold number of consecutive adjustment recommendations indicating a voltage decrease.

27. The apparatus of claim 24, wherein the threshold number is an integer value greater than one that is set via a means for programming.

28. The apparatus of claim 24, wherein a time interval between iterations is set via a means for programming.

29. The apparatus of claim 24, wherein the means for sampling is programmable to select between sampling techniques including serial sensor sampling and parallel sensor sampling and to perform a selected sampling technique during each iteration.

30. The apparatus of claim 24, further comprising means for regulating voltage, wherein the recommendation is issued to the means for regulating voltage.

31. The apparatus of claim 30, wherein the means for sampling, the means for determining, and the means for issuing are implemented on a first die, and wherein the means for regulating voltage is implemented at a power management integrated circuit (PMIC) on a second die that is distinct from the first die.

32. The apparatus of claim 31, wherein a time interval between iterations is longer than a transient of a power change of the PMIC.

33. The apparatus of claim 31, further comprising at least one additional means for sampling, at least one additional means for determining, and at least one additional means for issuing are implemented on the first die.

34. The apparatus of claim 24, wherein the adjustment recommendation is based on at least one of:

an operating condition of the semiconductor device, a temperature of the semiconductor device, or a performance of the semiconductor device.

35. A computer-readable storage device comprising instructions that, when executed by a processor, cause the processor to:

prior to issuing a recommendation by an adaptive voltage scaling (AVS) system;

perform a first iteration of an AVS operation to sample characteristics of a semiconductor device to determine a first adjustment recommendation; and

perform at least one additional iteration of the AVS operation to determine at least one additional adjustment recommendation; and

in response to the first adjustment recommendation and each of the at least one additional adjustment recommendations being consistent, issue the recommendation by the AVS system.

36. The computer-readable storage device of claim 35, wherein the recommendation is issued in response to the first adjustment recommendation and each of the at least one additional adjustment recommendations corresponding to a voltage increase.

37. The computer-readable storage device of claim 35, wherein the recommendation is issued in response to the first adjustment recommendation and each of the at least one additional adjustment recommendations corresponding to a voltage decrease.

38. The computer-readable storage device of claim 35, wherein the recommendation is issued in response to a threshold number of consecutive iterations having consistent adjustment recommendations, wherein the threshold number is a programmable integer value greater than one.

39. The computer-readable storage device of claim 35, wherein a time interval between iterations is programmable.

40. The computer-readable storage device of claim 35, wherein the AVS operation is performed by an AVS system that includes multiple sensors coupled to an AVS controller.

41. The computer-readable storage device of claim 40, wherein the AVS system is programmable to select between sampling techniques including serial sensor sampling and parallel sensor sampling and to perform a selected sampling technique during each iteration.

42. The computer-readable storage device of claim 35, wherein the recommendation is issued to a voltage regulator.

43. The computer-readable storage device of claim 42, wherein the AVS operation is performed by an AVS system on a first die, and wherein the voltage regulator is implemented at a power management integrated circuit (PMIC) on a second die that is distinct from the first die.

44. The computer-readable storage device of claim 43, wherein a time interval between iterations of the AVS operation is longer than a transient of a power change of the PMIC.

45. The computer-readable storage device of claim 43, wherein multiple AVS systems are implemented on the first die.

46. The computer-readable storage device of claim 35, wherein the first adjustment recommendation and the at least one additional adjustment recommendation are based on at least one of:

an operating condition of the semiconductor device, a temperature of the semiconductor device, or a performance of the semiconductor device.