Analog and mixed signal layout design automation

Abstract

Islam Nashaat Salah El-Din Mousa "Analog and mixed signal lay- out design automation", Master of Science dissertation, Ain Shams University, 2017. This thesis presents an automatic matched devices layout generation tool for any number of transistors or capacitors. An adapted form of genetic optimization is used to minimize the overall systematic mismatch due to oxide gradients and STI e ect. Results show that very low mismatches are obtained in a few seconds for moderate sized arrays. The analog design usually su ers from a loop of iterations mainly due to the added interconnect parasitic and the mismatch e ects in the layout. Accordingly, the chip speci cations may di er after fabrication than the results simulated by the designer. Moreover, the complexity of the analog layout design became a bottle-neck in the Deep Sub-Micron technology nodes. For these reasons the proposed ow was developed to ful ll the urgent need to have a fast, exible, reliable and technology independent analog layout design automation tools. Keywords: Layout, Automation, Matching, Current mirror, Capacitor array, Systematic, Random, Mismatch, STI, Optimization, Genetic algorithm, SOGA, MOGA, Mutation, Crossover, Selection, Fitness, Evolution, Placement, Modeling, Segmented Integral model, Constraints, Simulation, Celllevel. viii