1. A method of generating variation-aware library data, the method comprising: receiving a circuit simulation model on at least one device mismatch parameter; performing a sensitivity analysis on all device mismatch parameters, the sensitivity analysis including computing a rate of change of a timing property compared to a rate of change of a device mismatch parameter; deriving a distribution of each timing property using the sensitivity analysis; determining a mapping of one or more synthetic parameters to the distribution, each synthetic parameter being a random variable representing an impact on a timing parameter of all device mismatch parameters grouped to the synthetic parameter; selecting an assignment of device mismatch parameter values; and performing a deterministic circuit simulation using the assignment of device mismatch parameter values to generate the variation-aware library data corresponding to a 1 sigma of the synthetic parameter.