  CMOS technology scaling makes aging effects an important concern for the
design and fabrication of integrated circuits. Aging deterioration reduces the
useful life of a circuit, making it fail earlier. This deterioration can affect
all portions of a circuit and impacts its performance and reliability.
Contemporary literature shows solutions to monitor and mitigate aging using
hardware and software monitoring mechanisms and reconfiguration techniques. The
goal of this review of the state-of-the-art is to identify existing monitoring
and reconfiguration solutions for aging. This survey evaluates the aging
research, focusing the years from 2012 to 2019, and proposes a classification
for monitors and reconfiguration techniques. Results show that the most common
monitor type used for aging detection is to monitor timing errors, and the most
common reconfiguration technique used to deal with aging is voltage scaling.
Furthermore, most of the literature contributions are in the digital field,
using hardware solutions for monitoring aging in circuits. There are few
literature contributions in the analog area, being the scope of this survey in
the digital domain. By scrutinizing these solutions, this survey points
directions for further research and development of aging monitors and
reconfiguration techniques
