Method for laser scanning flip-chip integrated circuits
First Claim
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1. A method for analyzing temperature characteristics of an integrated circuit having internal circuitry in a region opposite a back side, comprising:
- directing a beam of laser light at a back side of the integrated circuit;
measuring an intensity level of laser light reflected from a target region including the circuitry in the integrated circuit; and
comparing the intensity level with a reference intensity level and, in response, obtaining a temperature characteristic of the integrated circuit.
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Abstract
Methods for analyzing temperature characteristics of an integrated circuit. In one embodiment, a beam of laser light is directed at the back side of an integrated circuit. The intensity level of laser light reflected from the integrated circuit is measured and compared to a reference intensity level. The magnitude of the difference between the reference intensity level and the intensity level of the reflected laser light is indicative of a temperature characteristic of the integrated circuit.
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Citations
25 Claims
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1. A method for analyzing temperature characteristics of an integrated circuit having internal circuitry in a region opposite a back side, comprising:
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directing a beam of laser light at a back side of the integrated circuit; measuring an intensity level of laser light reflected from a target region including the circuitry in the integrated circuit; and comparing the intensity level with a reference intensity level and, in response, obtaining a temperature characteristic of the integrated circuit. - View Dependent Claims (2, 3, 4, 5)
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6. A method for analyzing temperature characteristics of an integrated circuit, comprising:
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directing laser light at a back side of a first integrated circuit having internal circuitry in a target region opposite the back side; establishing a reference intensity level from laser light reflected from the target region including circuitry in the first integrated circuit; directing laser light at a back side of a second integrated circuit having internal circuitry in a target region opposite the back side; establishing a second intensity level from the laser light reflected from the target region including circuitry in the second integrated circuit; and comparing the reference intensity level to the second intensity level, whereby a magnitude of difference between the reference and second intensity levels indicates a temperature characteristic for the second integrated circuit relative to the first integrated circuit. - View Dependent Claims (7, 8, 9, 10, 11)
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12. A method for analyzing temperature characteristics of an integrated circuit, comprising:
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(a) scanning a first integrated circuit with a beam of laser light, the first integrated circuit being in a state in which no power is applied; (b) measuring a first intensity level of laser light reflected from a target region having circuitry in the first integrated circuit; (c) supplying voltage and current to the first integrated circuit; (d) running a selected series of test vectors on the first integrated circuit; (e) measuring a second intensity level of laser light reflected from the target region having circuitry in the first integrated circuit; (f) establishing a delta value of a difference between the first and second intensity levels; repeating steps (a)-(f) using a second integrated circuit instead of the first integrated circuit; comparing the delta value of the first integrated circuit to the delta value of the second integrated circuit whereby a magnitude of difference between the delta values indicates a temperature characteristic for the second integrated circuit relative to the first integrated circuit. - View Dependent Claims (13, 14, 15, 16, 17)
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18. A method for analyzing circuitry in an integrated circuit device having internal circuitry in a region opposite a back side, the method comprising:
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directing a beam of laser light at a target region including the circuitry via a back side of the integrated circuit device; and detecting a temperature characteristic of the integrated circuit device as a function of laser light reflected from the target region; and analyzing the integrated circuit device based upon said temperature characteristic.
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19. A system for analyzing circuitry in an integrated circuit die having internal circuitry in a region opposite a back side, the system comprising:
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means for directing a beam of laser light at a target region including the circuitry via a back side of the integrated circuit; means for detecting a temperature characteristic of the integrated circuit as a function of laser light that is reflected from the target region; and means for analyzing the integrated circuit based upon said temperature characteristic.
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20. A system for analyzing temperature characteristics of an integrated circuit die having internal circuitry in a region opposite a back side, comprising:
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a laser source configured to direct a beam of laser light at a target region including the circuitry via a back side of the integrated circuit; a detector arrangement configured to detect a temperature characteristic of the integrated circuit as a function of laser light that is reflected from the target region; and an analyzer for analyzing the integrated circuit based upon said temperature characteristic. - View Dependent Claims (21, 22, 23, 24, 25)
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Specification