the millimeter-wave (30–300 GHz) and terahertz (300–3000 GHz) frequency ranges. The
focus of this article is on nonlinear phenomena in electronics. The different implementations
of nonlinear circuits for the sake of millimeter-wave and terahertz signal generation are
studied in this paper. The challenges of signal generation are examined and the benefits
and limitations of different schemes of signal generation are discussed. It is shown that …