One embodiment of the present invention provides a system that facilitates redirecting the output of direct rendering graphics calls in a 3D window system. This transverse JFET comprises an n-type SiC substrate, a p-type SiC film formed on the right face of the n-type SiC substrate, an n-type SiC film, including a channel region, formed on the p-type SiC film, source and drain regions formed on the n-type SiC film separately on both sides of the channel region respectively, and a gate electrode provided in contact with the n-type SiC substrate. The scanning module can move from a home position to a position corresponding to the document. An amount of an averaged relaxation voltage, which reacts to a magnetic flux, may be controlled at the reference junction.