Dynamically adaptable semiconductor parametric testing
First Claim
Patent Images
1. A method comprising:
- probing a subset of test locations on a wafer using a first criteria;
probing all of the test locations using the first criteria when all of the subset of the test locations satisfy the first criteria; and
probing another subset of test locations on the wafer using a second criteria when some of the first criteria of the subset exceed a statistical threshold.
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Abstract
An apparatus, method, system, and signal-bearing medium may provide multiple maps, which may include multiple probing sequences to be called upon at run-time based on statistical thresholds or other selected criteria. Each map may include a series of locations on a wafer, the tests to perform at each location, and the measured results of each test. A parametric test system may perform the test at the associated location on the wafer. If the statistical threshold is exceeded or the selected criteria is met, the current map may be abandoned in favor of a different map.
72 Citations
71 Claims
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1. A method comprising:
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probing a subset of test locations on a wafer using a first criteria; probing all of the test locations using the first criteria when all of the subset of the test locations satisfy the first criteria; and probing another subset of test locations on the wafer using a second criteria when some of the first criteria of the subset exceed a statistical threshold. - View Dependent Claims (2, 3, 4, 5)
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6. A method comprising:
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probing a subset of test locations on a wafer using a first criteria; probing all of the test locations using the first criteria when all of the subset of the test locations satisfy the first criteria; probing all of the test locations using a second criteria when all of the subset of the test locations do not satisfy the first criteria; and probing all of the test locations using the second criteria when a percent badsite threshold is exceeded.
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7. A method comprising:
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probing a subset of test locations on a wafer using a first criteria; probing all of the test locations using the first criteria when all of the subset of the test locations satisfy the first criteria; probing all of the test locations using a second criteria when all of the subset of the test locations do not satisfy the first criteria; and probing all of the test locations using the second criteria when a percent badwafer threshold is exceeded.
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8. An apparatus comprising:
a parametric test control system to direct a prober to; probe a subset of test locations on a wafer using a first map, probe all of the test locations using the first map when all of the subset of the test locations satisfy a first criteria specified in the first map; and probe another subset of test locations on the wafer using a second map when the first criteria exceeds a predetermined criteria threshold. - View Dependent Claims (9, 10, 11, 12)
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13. An apparatus comprising:
a parametric test control system to direct a prober to; probe a subset of test locations on a wafer using a first map, probe all of the test locations using the first map when all of the subset of the test locations satisfy a first criteria specified in the first map; wherein the parametric test control system is further to direct the prober to probe all of the test locations using a second map when all of the subset of the test locations do not satisfy the first criteria specified in the first map; and wherein the parametric test control system is further to direct the prober to probe all of the test locations using the second map when a percent badsite threshold is exceeded.
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14. An apparatus comprising:
a parametric test control system to direct a prober to; probe a subset of test locations on a wafer using a first map, probe all of the test locations using the first map when all of the subset of the test locations satisfy a first criteria specified in the first map; wherein the parametric test control system is further to direct the prober to probe all of the test locations using a second map when all of the subset of the test locations do not satisfy the first criteria specified in the first map; and wherein the parametric test control system is further to direct the prober to probe all of the test locations using the second map when a percent badwafer threshold is exceeded.
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15. A signal-bearing medium encoded with instructions that when executed comprise:
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instructing a prober to probe first test locations on a wafer based on a first probing sequence specified in a first map; and switching to a second probing sequence specified in a second map prior to completion of the first probing sequence when a threshold is exceeded. - View Dependent Claims (16)
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17. A signal-bearing medium encoded with instructions that when executed comprise:
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instructing a prober to probe first test locations on a wafer based on a first probing sequence specified in a first map; switching to a second map prior to completion of the first probing sequence when a threshold is exceeded; and wherein the switching further comprises; switching to the second map prior to completion of the first probing sequence based on a badsite threshold being exceeded. - View Dependent Claims (18)
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19. A signal-bearing medium encoded with instructions that when executed comprise:
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instructing a prober to probe first test locations on a wafer based on a first probing sequence specified in a first map; switching to a second map prior to completion of the first probing sequence when a threshold is exceeded; and wherein the switching further comprises; switching to the second map prior to completion of the first probing sequence based on a badwafer threshold being exceeded. - View Dependent Claims (20)
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21. A signal-bearing medium encoded with a map data structure, wherein the map data structure comprises:
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a sequence of locations, wherein a parametric test control system is to probe the sequence of locations on a wafer; and a badwafer threshold, wherein the parametric test control system is to switch to a second map data structure when the badwafer threshold is exceeded. - View Dependent Claims (22, 23, 24)
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25. A signal-bearing medium encoded with a map data structure, wherein the map data structure comprises:
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a sequence of locations, wherein a parametric test control system is to probe the sequence of locations on a wafer; and a badsite threshold, wherein the parametric test control system is to switch to a second map data structure when the badsite threshold is exceeded. - View Dependent Claims (26, 27, 28, 29, 30)
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31. A method comprising:
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moving a prober to first test locations on a wafer in a first prober-movement pattern specified in a first map; and prior to completion of the first prober-movement pattern, moving the prober in a second prober-movement pattern specified in a second map. - View Dependent Claims (32, 33, 34)
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35. A method comprising:
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moving a prober to first test locations on a wafer in a first prober-movement pattern specified in a first map; and upon completion of the first prober-movement pattern, moving the prober in a second prober-movement pattern specified in a second map.
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36. A signal-bearing medium encoded with a data structure, wherein the data structure comprises:
an aggregate multiple wafer map including a prober movement map for probing a wafer comprising a mathematical union of a plurality of ordered map sets, wherein each of the map sets comprises at least one ordered site set, wherein each of the site sets comprises at least one ordered subsite set, wherein each of the subsite sets comprises at least one ordered measurement, and wherein a parametric test control system is to test a wafer using the mathematical union of the plurality of ordered map sets and wherein a statistical control limit of the parametric test control system causes a prober step sequence of the at least one ordered measurement to alternate. - View Dependent Claims (37)
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38. The signal-bearing medium encoded with a data structure, wherein the data structure comprises:
a composite multiple wafer map including a prober movement map for probing a wafer comprising a mathematical intersection of a plurality of ordered map sets, wherein each of the map sets comprises at least one ordered site set, wherein each of the site sets comprises at least one ordered subsite set, and wherein each of the subsite sets comprises at least one ordered measurement, and wherein a parametric test control system is to test a wafer using the mathematical intersection of the plurality of ordered map sets and wherein a statistical control limit of the parametric test control system causes a probe step sequence of the at least one ordered measurement to alternate. - View Dependent Claims (39)
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40. An apparatus comprising:
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a parametric test control system to form the intersection of a plurality of prober-movement map sets and test a wafer using the intersection; and a threshold parametric test to switch from a first prober-movement map to a second prober movement map of the plurality of prober-movement maps. - View Dependent Claims (41, 42, 43)
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44. A semiconductor parametric test system, comprising:
- a parametric test control system to form the union of a plurality of prober-movement map sets and to test a wafer using the union by switching to a second prober-movement map if a defect threshold was exceeded.
- View Dependent Claims (45, 46)
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47. An apparatus comprising:
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a prober; a load-unload system; an auto-alignment system; and a test control system to instruct the load-unload system to load a wafer on a chuck, instruct the auto-alignment system to align the wafer, read a test plan, instruct the prober to probe the wafer based on a current probe map of the test plan, and to determine whether to select a new wafer map based on an error threshold of the current probe map. - View Dependent Claims (48)
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49. A method, comprising:
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reading a first wafer map of test probe movements; loading a wafer on a chuck; performing tests on the wafer based on the test probe movements of the first wafer map; and determining whether to switch to a second wafer map of test probe movements based on the first wafer map and results of the tests. - View Dependent Claims (50, 51, 52, 53, 54, 55, 56)
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57. A method, comprising:
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reading a first wafer map; loading a wafer on a chuck; performing tests on the wafer based on the first wafer map; and determining whether to switch to a second wafer map based on the first wafer map and results of the tests; and wherein determining whether to switch further comprises determining whether the results of the tests indicate that a badsite threshold has been exceeded. - View Dependent Claims (58)
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59. A method, comprising:
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reading a first wafer map; loading a wafer on a chuck; performing tests on the wafer based on the first wafer map; and determining whether to switch to a second wafer map based on the first wafer map and results of the tests; and wherein determining whether to switch further comprises determining whether the results of the tests indicate that a badwafer threshold has been exceeded. - View Dependent Claims (60)
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61. A parametric test system comprising:
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a loader to load a wafer; a prober comprising test pins to perform tests on the wafer; and a test control system to command the prober to move in a plurality of probing sequences specified in a respective plurality of maps and to switch between the maps based on measured results of the tests. - View Dependent Claims (62, 63, 64, 65, 66, 67, 68, 69, 70, 71)
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Specification