Improving Yield and Defect Tolerance in Multifunction Subthreshold CMOS Gates
This paper presents simulations of 3 different implementations of the minority-3 function, with special focus on mismatch analysis through statistical Monte Carlo-simulations. The simulations clearly favors the minority-3 Mirrored gate, and a gate-level redundancy scheme, where identical circuits with the same input drive the same output-node, is further explored as a means of increasing fault- and defect-tolerance. Important tradeoffs between supply voltage, redundancy and yield are revealed, and V_D_D = 175 mV is suggested as a minimum useful operating voltage, combined with a redundancy factor of 2.
Citation:
Kristian Granhaug, Snorre Aunet, "Improving Yield and Defect Tolerance in Multifunction Subthreshold CMOS Gates," dft,pp.20-28, 21st IEEE International Symposium on Defect and Fault-Tolerance in VLSI Systems (DFT'06), 2006