Purpose -Imperfactions in manufacturing processes may cause unwanted connections (faults) that are added to the nominal, "golden", design of an electronic circuit. By fault simulation one simulates all situations. Normally this leads to a large list of simulations in which for each defect a steady-state (DC) solution is determined followed by a transient simulation. We improve the robustness and the effciency of these simulations. Design/methodology/approach -Determining the DC solution can be very hard. For this we present an adaptive time domain source stepping procedure that can deal with controlled sources. The method can easily be combined with existing pseudo-transient procedures. The method is robust and efficient. In the subsequent transient simulation the solution of a fault is compared to a golden, fault-free, solution. A strategy is developed to efficiently simulate the faulty solutions until their moment of detection. Finding -We fully exploit the hierarchical structure the circuit in the simulation process to bypass parts of the circuit that appear to be unaffected by the fault. Accurate prediction and efficient solution procedures lead to fast fault simulation. Originality/value -Our fast fault simulation helps to store a database with detectable deviations for each fault. If such a detectable output "matches" a result of a product that has been returned because of malfunctioning it helps to identify the subcircuit that may contain the real fault. One aims to detect as much as possible candidate faults. Because of the many options the simulations must be very efficient.
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We present an application of Defect Oriented Testing (DOT 1 ) to an industrial mixed signal device to reduce test time and maintain quality. The device is an automotive IC product with stringent quality requirements and a mature test program that is already in volume production. A complete flow is presented including defect extraction, defect simulation, test selection, and validation. A major challenge of DOT for mixed signal devices is the simulation time. We address this challenge with a new fault simulation algorithm that provides significant speedup in the DOT process. Based on the fault simulations, we determine a minimal set of tests which detects all defects. The proposed minimal test set is compared with the actual test results of more than a million ICs. We prove that the production tests of the device can be reduced by at least 35%.
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