Analog system engineering is an academic discipline and methodological approach concerned with the conception, design, analysis, and realization of systems that predominantly process, transmit, or interact with continuous-time (analog) signals. It investigates the behavior, characteristics, and integration of components and subsystems where signal amplitude varies continuously, often representing physical phenomena, and its significance lies in enabling the creation of systems that directly interface with and manipulate signals from the physical world for applications such as sensing, communication, and control.