This book encompasses three primary methodologies for designing circuits, specifically focusing on the utilization of Analog Multipliers (AMs), second-generation current-controlled-conveyors (CCCII), and the MOS-dynamic translinear circuits approach. These approaches still hold promise for creating novel circuit topologies in the realm of electronically controllable analog circuits. The book introduces several innovative contributions to the design of electronically controllable analog circuits, offering potential applications in scenarios requiring electronically controlled functions.