Abstracto

Fault Tolerant Digital System Using Self-Repairing System

M.Saranya, S.Mahalakshmi

Reliability has always been an important issue with electronic systems ever since the first electronic systems were designed. compared to the biological systems, the electronic systems are so fragile that even a single problem can occurs then the total system useless. Therefore, devising fault-tolerant systems that can deal with such delicate problems has been a considerable challenge. During the early stages of the development of fault-tolerant systems, dual modular redundancy (DMR) and triple modular redundancy (TMR) methods were introduced. These techniques ran the same modules in parallel, and thus a faulty module could be distinguished by comparing outputs of the same modules and voting for the majority one (with TMR) or by using an additional device (with DMR). However, these methods are only detect the fault and it can’t be replace the faultless part instead of faulty part in a system when the fault occurrence.The size of the module is so huge that a large part of the circuit must be replaced even if a small part in the module is malfunctioning. In this paper, we propose a self-repairing system that the faulty part or cell can be replaced by the faultless part or cell in a system..so it increases the reliability.