Diversity TMR: Proof of concept in a mixed-signal case

In this paper a design diversity fault tolerance technique is applied to a mixed-signal (MS) system. Three different implementations of a second order low-pass filter (which perform the same transfer function) associated to a majority voter are used to build the TMR scheme. The whole system is prototyped by using a programmable mixed-signal device. Some functional faults are injected into the circuit blocks and practical measurements are made on the prototyped system. Results show that the design diversity TMR is a feasible technique that can increase reliability of some classes of state-of-art MS circuits.