Methods and apparatus for data analysis
A method and apparatus for data analysis according to various aspects of the present invention is configured to automatically identify a characteristic of a component fabrication process guided by characteristics of the test data for the components. A method and apparatus according to various aspects of the present invention may operate in conjunction with a test system having a tester, such as automatic test equipment (ATE) for testing semiconductors.
1. A test system, comprising:
a tester configured to test a set of components and generate test data for the set of components;
a diagnostic system configured to receive the test data from the tester and automatically analyze the test data to identify a problem in a process for fabricating the components, wherein the diagnostic system is configured to recognize a pattern in the test data and match the recognized pattern with the problem, and wherein the diagnostic system includes a classifier configured to classify the pattern using an evolutionary algorithm.
2. A test system according to claim 1 , wherein the evolutionary algorithm includes a particle swarm optimization algorithm.
3. A test system according to claim 1 , wherein the diagnostic system comprises at least two stages, wherein
a first stage comprises a plurality of classifiers configured to receive different types of test data and generates first stage data based on the different types of test data; and
a second stage configured to receive the first stage data from the plurality of classifiers and classify the pattern using an evolutionary algorithm based on the first stage data.
4. A test system according to claim 3 , wherein the first and second stages comprise self-adaptive systems, and the first and second stages are independently trainable.
5. A test system according to claim 1 , wherein the evolutionary algorithm includes at least one of a particle swarm optimization algorithm and a genetic algorithm.
6. A test system according to claim 1 , wherein the diagnostic system comprises at least one of a particle swarm optimization system, a genetic algorithm system, a radial basic function neural network, and a multilayer perceptron neural network.
7. A test system according to claim 1 , wherein the diagnostic system is configured to automatically select an outlier identification algorithm to analyze the test data.
8. A test system according to claim 7 , wherein the diagnostic system is configured to select the outlier algorithm based on at least one of the test data's data population type and the type of test generated by the tester.
9. A test system according to claim 7 , wherein the diagnostic system is configured to analyze the test data using a plurality of outlier identification algorithms.
10. A test system according to claim 7 , wherein the diagnostic system is configured to select the outlier algorithm from a configurable algorithm library.
11. A test system according to claim 1 , further comprising a configurable knowledge base, wherein the diagnostic system is configured to retrieve stored information from the knowledge base to analyze the test data.
12. A test system according to claim 11 , wherein the diagnostic system comprises a self-adaptive system configured to learn from a set of historical test data.
13. A test system according to claim 12 , wherein the self-adaptive system is configured to learn from the test data generated by the tester.
14. A test system according to claim 1 , wherein the diagnostic system is configured to generate supplemental data based on the test data, wherein the supplemental data is not dependent on a type of the components or a type of the test data.
15. A test system according to claim 14 , wherein the diagnostic system is configured to filter the test data.
16. A test system according to claim 14 , wherein the diagnostic system is configured to identify a trend in the test data.
17. A test system according to claim 1 , wherein:
the tester is configured to generate the test data using multisite testing; and
the diagnostic system is configured to normalize the test data to counter an effect of the multisite testing.
18. A test system according to claim 1 , wherein the test data comprises at least one of historical data and real-time data.
19. A test system according to claim 1 , wherein the diagnostic system is configured to automatically provide a corrective action based on the analysis of the test data.