Varactor and reference oscillator structures are provided that are particularly suited for integrated circuit fabrication and which provide excellent parameter performance so that they are useful in a variety of wireless communication structures. The method includes detecting an event, assign a first responsibility to a first graphics processing unit and a second responsibility to second GPU, and changing a power state of the first and second GPUs based on the first and second responsibilities, respectively. The high bandwidth channel capacity of digital satellite systems is used for the download of large volumes of data.