We have developed a multiscale method to model emerging electronic devices.It features a combination of first-principles calculation,semi-classical semiconductor device simulation,compact model generation and circuit simulation.We have applied the method to model a new type of transistors and their circuits:junctionless fieldeffect transistor.The transfer characteristics of junctionless field-effect transistors are simulated by a recently devel- We have developed a multiscale method to model emerging electronic devices. If features a combination of first-principles calculation, semi-classical semiconductor device simulation, compact model generation and circuit simulation. We have applied the method to model a new type of transistors and their circuits: junctionless fieldeffect transistor.The transfer characteristics of junctionless field-effect transistors are simulated by a recently devel-