The main objective of this book is to elaborate on MOS current-mode logic circuits and provide the readers a deep understanding of modelling and design strategies of current-mode digital circuits. The book presents different structures proposed in literature based on current-mode logic and compares them by consolidating all the results. First, the literature review of various MOS current mode logic topologies have presented. Then the book introduces MOS Current mode logic circuits which helps develop the elementary concepts and understanding of the circuits. Further, dynamic current mode logic design styles (DyCML-1 and DyCML-2) and hybrid structure of dynamic current mode logic design styles (H-DyCML-1 and H-DyCML-2) have been discussed. Their structures and working principle are discussed and compared. Finally, all the designing styles (DyCML-1, DyCML-2, H-DyCML-1 and H-DyCML-2) are compared for multi-level applications. For multi-level design applications, cascading with the help of self-timed buffers is explained.