Self-dual duplication for error detection

In this paper we propose a new method for the implementation of a self-dual circuit with alternating inputs. For every circuit output the self-dual complement is designed. Contrary to ordinary duplication and comparison the corresponding self-dual complements and the monitored circuit itself can be jointly, implemented. The self-dual duplicated circuits can be used in test mode, online mode and in fast mode without alternating inputs. Because of the necessary time redundancy, the approach is especially useful for online testing of control systems for which time is not critical