A system and method for updating an offline virtual machine are disclosed. A simulated approximation diffraction signal is generated based on an approximation diffraction model of the structure. Thus, relatively large dynamic range is enabled for integrated circuits fabricated using feature-rich lower voltage rated semiconductor processes. The second frame signal is a previous frame having a second number of bits composed of upper bits of the first number of bits other than at least one lower bit. The circuit includes a first and second reference voltage terminal, and a first, second, and third switch. Substantially no AC stress exists between winding sets.