1. An integrated circuit comprising: an oscillator comprising an inductor and a capacitor, the oscillator adapted to provide a first reference signal having a first frequency, the oscillator further adapted to operate without locking to an external reference signal; a voltage controller adapted to provide a plurality of voltage control signals; a plurality of switchable, controlled reactance modules coupled to the oscillator and to the voltage controller, each reactance module of the plurality of reactance modules adapted to provide a selected reactance in response to a corresponding voltage control signal of the plurality of voltage control signals to modify the first frequency; and an output circuit adapted to provide an output interface for signal communication.