Automated design of analog computational circuits using cell-based structure

An automated synthesis for analog computational circuits in transistor-level configuration is presented. A cell-based structure is introduced to express moderate constraints on the MOSFET circuit topology. Even though each cell has a simple structure that consists of one current path with four transistors, well-known building blocks can be expressed using combinations of the cells. A genetic algorithm is applied to search circuit topologies and transistor sizes that satisfy given specifications. Synthesis capabilities are demonstrated through examples of three types of computational circuits, such as absolute, squaring, and cubing functions.