Concurrent error detection in nonlinear digital circuits with applications to adaptive filters

Concurrent error detection in digital state variable circuits is very important, because they are often used in critical digital signal processing (DSP) and control applications where error in processed data can have catastrophic effects. Typically, error detection is performed by a small amount of additional hardware called the checking circuit. In this paper, we investigate concurrent error detection techniques for nonlinear digital circuits that compute polynomial functions of multiple variables. The novelty of our approach allows us to use the nonlinear functions to drive the check circuitry without duplicating the entire nonlinear part, while achieving high fault coverage