Data structures and algorithms are provided to automatically generate an analog stimulus to apply to a simulation of the analog DUT. A constraint solver is provided to determine suitable values to use in the stimulus generation. The suitable values are random values within a range of allowed values. For example, a number of different stimuli are generated for successive application to the analog DUT, each with a different magnitude within a range of allowed magnitudes. Data structures and algorithms are provided to monitor analog electrical properties at nodes of the analog DUT. Data structures and algorithms are provided to define constraints on the analog electrical properties and determine whether the constraints were violated. Data structures and algorithms are provided to define simulation coverage conditions in the analog domain and determine whether the defined analog domain coverage conditions have been satisfied.