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Fault Diagnosis Using Fault Dictionaries and Probability

Explore fault diagnosis using fault dictionaries and probability to quantify uncertainties, identify faults, and improve circuit reliability. Discover the likelihood function, diagnostic algorithm, and results on a 4-bit ALU to make conclusive judgments on faults.

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Fault Diagnosis Using Fault Dictionaries and Probability

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  1. Fault Diagnosis Using Fault Dictionaries and Probability Adam Ray April 28, 2005 Ray: ELEC7250

  2. Problem Statement • Identify which fault occurred in a failing circuit • Need a way to quantify inherent uncertainties • Equivalent faults • Truncated test sets • Assumptions • Single stuck-at faults • Stuck-at fault is lowest replaceable unit (LRU) Ray: ELEC7250

  3. The Likelihood Function Likelihood of fault i, time t Faults 0,…,m failed at time t-1 N(t)=total # of remaining faults Ray: ELEC7250

  4. Diagnostic Algorithm Ray: ELEC7250

  5. Results on 4-Bit ALU After Tests 1 & 2 After Tests 5 & 6 After All Tests Ray: ELEC7250

  6. More Results Fault 22-1-1 found with several wrong faults Ray: ELEC7250

  7. Add beginning likelihoods Ray: ELEC7250

  8. Conclusions • Algorithm correctly identifies the fault • Equivalent faults are incorrectly identified • Likelihood makes results more conclusive • Algorithm can be halted at any point • New Algorithm for multiple faults Ray: ELEC7250

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