Simplified fault tolerant FIR filter architecture based on redundant residue number system

A low cost fault tolerant finite impulse response (FIR) filter is presented to save logic resources. Based on redundant residue number system (RRNS), it eliminates soft errors generated by single event upset (SEU) in space applications, which requires only one three-moduli set residue to binary converter (RTBC) based on Chinese remainder theorem (CRT). When a soft error happens, only one small-size first-in first-out (FIFO) and rollback operations are needed to refresh FIR filter corrupted by SEU. Theoretical analysis and fault injections are performed to validate that there is no fault missing event. In addition, our proposed scheme can save 21 % cell area compared with the conventional RRNS method. Introduction: Single event upset (SEU) is one of the most serious effects in space applications, which alters the state of a flip-flop or memory cell resulting in a soft error. It could reduce the reliability of space communications and produce bit errors if no action is taken [1]. Finite impulse response (FIR) filters with multiply and accumulatio