Pros and Cons of Schmitt Trigger Inverters to Mitigate PVT Variability on Full Adders

This paper evaluates the benefits and drawbacks of using Schmitt Trigger (ST) inverters to minimize process, voltage and temperature variability effects on full adders. Variability mainly affects the energy outcomes on full adders, and the use of ST techniques can decrease up to 80% the energy deviation. However, it implies in a significant increase on the energy consumption. Considering the pros and cons, Mirror CMOS FA is the most beneficiated with the ST inverters, with a small impact on the average delay and a significant reduction in the energy and delay deviation.