“…Actually it is a bistable multivibrator circuit which converts a varying voltage into an unvarying logical voltage signal (zero or one). Numerous design and implementation of Schmitt trigger circuits for different applications and advantages has been proposed in literatures by many researchers (Lotze & Manoli, 2012;Saini, Veeramachaneni, Kumar, & Srinivas, 2009;Kulkarni, Kim, & Roy, 2007;Wu & Chiang, 2004;Morimura et al, 2004;Kim, Kim, & Chung, 2007;Dokic, 1984;Dokic & Bundalo, 1985;Wang, 1991;Kim, Joongsik, & Kim, 1993;Dokic, 1996;Zhang, Srivastava, & Ajmera, 2003;Franco, 1988;Dokic, 1984;Azeemuddin & Sayeh, 2011;Chen & Ker, 2005;Kuang & Chuang, 2001;Stayaert & Sansen, 1986;Singhanat et al, 2011;Ahdal & Toumazou, 2012). This paper presents a detail review on the merits and demerits of each circuit from its architecture and performance point of view illustrated in literatures for last two decades.…”