METHOD FOR MANAGING CIRCUIT RELIABILITY

• US 20120218030A1
• Filed: 02/25/2011
• Published: 08/30/2012
• Est. Priority Date: 02/25/2011
• Status: Active Grant

• Current Assignee: International Business Machines Corporation
• Original Assignee: International Business Machines Corporation
• Inventors: Chen, Fen, Feng, Kai D., He, Zhong-Xiang
• Granted Patent: US 8,237,463 B1
• Time in Patent Office: Days
• US Class Current: 327/526
• CPC Class Codes: H03K 19/00307 in bipolar transistor circuits

Abstract

Managing reliability of a circuit that includes a plurality of duplicate components, with less than all of the components being active at any time during circuit operation, where reliability is managed by operating, by the circuit, with a first set of components that includes a predefined number of components; selecting, without altering circuit performance and in accordance with a circuit reliability protocol, a second set of components with which to operate, including activating an inactive component and deactivating an active component of the first set of components; and operating, by the circuit, with the second set of components.

Claims

1. A method for managing reliability of a circuit, the circuit comprising a plurality of duplicate components, each of the components comprising one or more modules of electronic circuitry and each of the components having a same operating characteristic, less than all of the components being active at any time during circuit operation, the method comprising:

operating the circuit with a first set of the components;

selecting a second set of the components with which to operate without altering circuit performance and in accordance with a circuit reliability protocol, including deactivating at least one component of the first set and activating at least one other component of the circuit as part of the second set; and

operating the circuit with the second set of components.

2. The method of claim 1 wherein selecting a second set of components with which to operate further comprises:

selecting the second set of components with which to operate the circuit upon expiration of a predefined period of time.

3. The method of claim 2 wherein:

the circuit further comprises a timer module, a circular shift register, and a plurality of switches, each switch configured to electrically couple a component for circuit operation; and

the timer module is configured to signal the circular shift register upon the expiration of the predefined period of time;

the circular shift register, responsive to the timer module'"'"'s signaling, is configured to signal a switch to decouple a component from circuit operation and signal another switch to couple another component for circuit operation.

4. The method of claim 1, further comprising accumulating, for each component during circuit operation, an active time, wherein:

selecting a second set of components with which to operate further comprises;

detecting a power-on of the circuit; and

responsive to detecting the power-on, selecting, from among all components, a predefined number of components having the lowest accumulated active times.

5. The method of claim 4 wherein the circuit further comprises a controller, non-volatile memory and a plurality of switches, the controller operatively coupled to the non-volatile memory and the plurality of switches, each switch configured to electrically couple a component for circuit operation, the controller configured to:

accumulate each component'"'"'s active time;

store each component'"'"'s active time in the non-volatile memory;

detect the power-on;

responsive to detecting the power-on, select the predefined number of components having the lowest accumulated active times;

signal one or more switches to couple the selected components for circuit operation; and

signal one or more switches to decouple from circuit operation components of the first set not identified as having the lowest accumulated active times.

6. The method of claim 1 wherein:

operating with the first set of components further comprises monitoring, in real-time, a health indicator of each component of the first set; and

selecting the second set of components with which to operate further comprises;

discovering that the health indicator of a component of the first set does not meet acceptability criteria; and

selecting, for deactivation, the component having the unacceptable health indicator.

7. The method of claim 4 wherein:

the circuit further comprises a controller, non-volatile memory, health monitoring logic, and a plurality of switches, the health monitoring logic operatively coupled to the controller, the controller operatively coupled to the non-volatile memory and the plurality of switches, wherein;

each switch is configured to electrically couple a component for circuit operation;

the health monitoring logic is configured to monitor the health indicator of each component of the first set, discover that the health indicator of a component of the first set does not meet acceptability criteria, and signal the controller upon the discovery; and

the controller is configured to store in non-volatile memory an identification of the component having the unacceptable health indicator, select a component not previously having an unacceptable health indicator, signal a switch to couple the selected component for circuit operation, and signal a switch to decouple the component having the unacceptable health indicator from circuit operation.

8. The method of claim 7 wherein the plurality of duplicate components comprises a plurality of capacitor having the same capacitance and the health monitoring logic monitors current leakage of each active capacitor during circuit operation.

9. The method of claim 1 wherein the plurality of duplicate components comprises a plurality of capacitors having the same capacitance.

10. A circuit with managed reliability, the circuit comprising:

a plurality of duplicate components, each of the components comprising one or more modules of electronic circuitry and each of the components having a same operating characteristic, less than all of the components being active at any time during circuit operation;

a first set of the components operating in the circuit; and

component selection logic configured to select a second set of components with which to operate without altering circuit performance and in accordance with a circuit reliability protocol, including deactivating at least one component of the first set and activating at least one other component of the circuit as part of the second set.

11. The circuit of claim 10 wherein the component selection logic is further configured to:

selecting the second set of components with which to operate the circuit upon expiration of a predefined period of time.

12. The circuit of claim 11 wherein the component selection logic further comprises:

a timer module, a circular shift register, and a plurality of switches, each switch configured to electrically couple a component for circuit operation;

wherein;

the timer module is configured to signal the circular shift register upon the expiration of the predefined period of time; and

the circular shift register, responsive to the timer module'"'"'s signaling, is configured to signal a switch to decouple one component from circuit operation and signal another switch to couple another component for circuit operation.

13. The circuit of claim 10, wherein the component selection logic further comprises:

accumulation logic configured to accumulate, for each component during circuit operation, an active time, wherein the component selection logic is further configured to;

detect a power-on of the circuit; and

responsive to detecting the power-on, select, from among all components, a predefined number of components having the lowest accumulated active times.

14. The circuit of claim 13 wherein the component selection logic further comprising a controller, non-volatile memory and a plurality of switches, the controller operatively coupled to the non-volatile memory and the plurality of switches, each switch configured to electrically couple a component for circuit operation, wherein the controller is configured to:

accumulate each component'"'"'s active time;

store each component'"'"'s active time in the non-volatile memory;

detect the power-on;

responsive to detecting the power-on, select the predefined number of components having the lowest accumulated active times;

signal one or more switches to couple only the selected components for circuit operation.

15. The circuit of claim 10 wherein the component selection logic further comprises:

health monitoring logic configured to monitor, in real-time, a health indicator of each component of the first set; and

discover that the health indicator of a component of the first set does not meet acceptability criteria;

wherein the component selection logic is further configured to;

deactivate the component having the unacceptable health indicator; and

activate another component.

16. The circuit of claim 15, wherein the component selection logic further comprises a controller, non-volatile memory, and a plurality of switches, the controller operatively coupled to the health monitoring logic, the non-volatile memory and the plurality of switches, wherein:

each switch is configured to electrically couple a component for circuit operation; and

the controller is configured to store in non-volatile memory an identification of the component having the unacceptable health indicator, select a component not previously having an unacceptable health indicator, signal a switch to couple the selected component for circuit operation, and signal a switch to decouple the component having the unacceptable health indicator from circuit operation.

17. The circuit of claim 16 wherein the plurality of duplicate components comprises a plurality of capacitors having the same capacitance and the health monitoring logic monitors current leakage of each active capacitor during circuit operation.

18. The circuit of claim 10 wherein the plurality of duplicate components comprises a plurality of capacitors having the same capacitance.