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Triple-modular redundancy (TMR) is a classical technique for improving the reliability of digital systems. However, applying TMR to microcomputer systems may not improve overall system reliability because voter circuits may contribute as much to system unreliability as the microprocessors themselves. We examine the issues that affect the effectiveness of TMR for transient recovery and the reliability of semiconductor memory systems. With careful application, TMR can improve the mission time of a small system by a factor of 3 or more.
John F. Wakerly (Thu,) studied this question.
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