A power source device includes an assembled battery having a plurality of secondary battery cells connected in series, and a plurality of discharge circuits connected in parallel with the secondary battery cells, respectively. A source layer of the second conduction type is formed in the surface of the semiconductor layer at a position adjacent to the LDD layer. A unique assignment of the pulses to the respective apertures is rendered possible by their spacings, specified in accordance with the distribution, and amplitudes. The combiner provides an image from the respective image source to a user. By employing the trenched contacts in trench MOSFET and trench Schottky rectifier, the integrated circuit is able to be shrunk to achieve low specific on-resistance for trench MOSFET, and low Vf and reverse leakage current for trench Schottky Rectifier. In one embodiment, channel allocation techniques for increasing one or more of throughput and coverage in a wireless communications environment.