Method and apparatus for predicting the reliability of electronic systems

• US 7,514,941 B2
• Filed: 03/15/2006
• Issued: 04/07/2009
• Est. Priority Date: 03/15/2006
• Status: Active Grant

• Current Assignee: Raytheon Company (Rtx Corporation)
• Original Assignee: Raytheon Company (Rtx Corporation)
• Inventors: Barton, Paul H.
• Primary Examiner(s): Dole; Timothy J
• Assistant Examiner(s): ZHU, JOHN X
• Application Number:
  US11/376,942
• Publication Number:
  US 20070216427A1
• Time in Patent Office: 1,119 Days
• Field of Search: 324/719, 324/760
• US Class Current: 324/719
• CPC Class Codes: G01L 5/0047 measuring forces due to residual stresses
• CPC Class Codes: H05K 1/0268 for electrical inspection or testing
• CPC Class Codes: H05K 1/0271 Arrangements for reducing stress or warp in rigid printed circuit boards, e.g. caused by loads, vibrations or differences in thermal expansion
• CPC Class Codes: H05K 2201/10151 Sensor
• CPC Class Codes: H05K 2203/163 Monitoring a manufacturing process

Abstract

An apparatus for predicting the reliability of an electronic system is provided. The apparatus includes at least one component, a stress sensor operable to measure stress of the at least one component, a resistance sensor operable to measure an electrical resistance of the at least one component, and an electronic control system coupled to the stress sensor and resistance sensor operable to predict the reliability of the electronic system using the stress and electrical resistance of the at least one component.

Claims

1. An apparatus for predicting the reliability of an electronic system comprising at least one component, the apparatus comprising:

an acceleration sensor operable to measure acceleration of the at least one component;

a resistance sensor operable to measure an electrical resistance of the at least one component; and

an electronic control system coupled to the acceleration sensor and resistance sensor to predict the reliability of the electronic system using the acceleration and electrical resistance of the at least one component.

2. The apparatus of claim 1, wherein the resistance sensor further comprises:

a reference resistor coupled to the at least component; and

a reference voltage source coupled to the reference resistor.

3. The apparatus of claim 2, wherein the resistance sensor further comprises:

an amplifier coupled to the at least one component;

a multiplexer coupled to the amplifier; and

an analog to digital converter coupled to the multiplexer wherein the analog to digital converter is coupled to the electronic control system.

4. The apparatus of claim 1, wherein the acceleration sensor comprises a strain gauge.

5. The apparatus of claim 1, wherein the electronic control system comprises at least one member of the set consisting of a computer, an ASIC, an FPGA, and other logic implementation.

6. The apparatus of claim 1, wherein the at least one component comprises at least one member of the set consisting of:

solder joints, solder bumps, traces, vias, connectors, pins, wires, and integrated circuit structures.

7. The apparatus of claim 1, wherein the at least one component is representative of other components comprising the electronic system.

8. The apparatus of claim 1, wherein the at least one component comprises at least one member of the set consisting of:

unused solder joints, unused solder bumps, unused traces, unused vias, unused connectors, unused pins, unused wires, and unused integrated circuit structures.

9. The apparatus of claim 1, wherein the acceleration sensor comprises an accelerometer.

10. The apparatus of claim 1, wherein the electronic control system is further operable to store the resistance measurements and acceleration measurements.

11. A method for predicting the reliability of an electronic system under stress, the method comprising:

measuring the electrical resistance of a component of the electronic system over a time period;

determining changes in electrical resistance of the component over the time period;

measuring the acceleration of the component over the time period; and

predicting a time period that the component will remain operational before failing by comparing the change in resistance of the component and the acceleration of the component over the time period to predetermined reliability data associated with the change in resistance and acceleration.

12. The method of claim 11 wherein the component is representative of a set of components comprising the electronic system.

13. The method of claim 11 wherein the component comprises at least one member of the set consisting of:

solder joints, solder bumps, traces, vias, connectors, pins, wires, and integrated circuit structures.

14. The method of claim 11 wherein the electric resistance of a component is measured using a voltage at the component.

15. A computerized method for predicting the reliability of a first electronic system comprising:

measuring a resistance change of a component of a representative second electronic system at time intervals until the second electronic system fails;

measuring an acceleration of the component of the second electronic system at the time intervals;

storing the resistance change measurements, acceleration measurements, and time intervals in an information storage system; and

predicting a time period that the first electronic system will remain operational before failing by;

measuring the resistance change of a component of the first electronic system at the time intervals;

measuring the acceleration of the component of the first electronic system at the time intervals; and

comparing the change in resistance of the component and the acceleration of the component of the first electronic system to the stored resistance change measurements and acceleration measurements of the representative second electronic system using a computer.

16. The method of claim 15 wherein the component of the second electronic system is representative of a set of components comprising the electronic system.

17. The method of claim 15 wherein the component of the second electronic system comprises at least one member of the set consisting of:

solder joints, solder bumps, traces, vias, connectors, pins, wires, and integrated circuit structures.

18. The method of claim 15 wherein the electric resistance of a component is measured using a voltage at the component.

19. The method of claim 15, wherein the component of the first electronic system is representative of components comprising the electronic system.

20. The method of claim 15, wherein the electrical resistance of the component is measured using the rate of discharge of a capacitor connected to the component.

21. The method of claim 15, wherein the acceleration of the component is measured by a strain gauge.

22. The method of claim 15, wherein the acceleration of the component is measured by an accelerometer.

23. The method of claim 15 wherein the component of the first electronic system comprises at least one member of the set consisting of:

solder joints, solder bumps, traces, vias, connectors, pins, wires, and integrated circuit structures.