Abstract: In a circuit board having a multilayer structure comprising a ground pattern and a power-supply pattern both, for example, by forming a plurality of slits along each side of the ground pattern or the power-supply pattern, a long thin conduction path connecting a corner and a side center of the ground pattern is formed and resistive elements are placed in the middles of the conduction path to short, circuit the corner and a side center of the ground pattern. Therefore, portions corresponding to an antinode and a node or antinode and an antinode of a standing wave are short-circuited. The standing wave is generated when electric power is supplied to ICs and LSIs mounted on the circuit board. Thus, noise sources caused by the standing wave cancel each other. As a result, the occurrence of an antiresonance phenomenon and an increase in impedance of the power supplying system caused by the standing wave can be suppressed.

Abstract: The objective of the present invention is to provide an information processing device that is operable by a battery and which suppresses the generation of standing waves and has little radiation noise. In the information processing device of the present invention having means for connecting to a battery pack that stores a battery for supplying power to the information processing device, there is one or more capacitive element (for example, a capacitor) in the proximity of the terminals of the positive and negative poles of the battery when the battery pack is connected to the information processing device, and it is possible for at least the terminal of the positive pole of the battery or the terminal of the negative pole of the battery to be connected electrically to the ground of the information processing device by way of this capacitive element.

Abstract: In a circuit simulation system, a simulator and part of device models and circuit models are stored in a server on the Internet, a user sends arbitrary circuit data to the server, the server carries out calculation using the circuit data received from the user and the device and circuit models stored therein, and then the server returns the results of calculation to the user.

Abstract: A semiconductor device includes a semiconductor die having patterned circuitry, a plurality of terminals coupled to the die, and an indication providing signal noise information of at least one of the terminals.

Abstract: There is provided a technology for realizing an PCI expansion adapter for a PC card which is connectable to a desktop type personal computer PCI expansion connector using a low profile PCI. The PCI expansion adapter includes an expansion unit which is provided with an electrical connector to a PCI bus, a low profile PCI expansion board provided with a PC card control element and an electrical connector to the PC card, wherein the low profile PCI expansion board and the expansion unit are connected by the electrical connectors mounted on the respective boards.

Abstract: A wireless LAN system is provided to make a frequency band setup task easy such that interference among base stations is reduced. The base station connected to a wired LAN includes a wired connection unit connected to the wired LAN and a wireless communication unit communicating with a LAN terminal via radio waves. The base station finds frequency bands already used by other devices in a place where the base station is installed and sets up a frequency band not used by the other devices as a frequency band to be used by the wireless communication unit to automatically set up a frequency band of radio waves to be used by the wireless communication unit.

Abstract: A wireless LAN system is provided to make a frequency band setup task easy such that interference among base stations is reduced. The base station connected to a wired LAN includes a wired connection unit connected to the wired LAN and a wireless communication unit communicating with a LAN terminal via radio waves. The base station finds frequency bands already used by other devices in a place where the base station is installed and sets up a frequency band not used by the other devices as a frequency band to be used by the wireless communication unit to automatically set up a frequency band of radio waves to be used by the wireless communication unit.

Abstract: A communication system is provided of selecting the most approximate line from two or more connectable lines and connecting with a provider through the selected line in the mobile communication environment. The mobile device and the public phone of each phone company provide a standard wireless data communication facility, respectively. The public line pre-stores information about dial-up numbers of access points and a transmission speed of an internet provider. When the user starts the communication, the mobile device operates to obtain the most approximate access point information from each of the public phones and then dial up the most approximate access point through the public phone/line well-specified to the user.

Abstract: There is provided a technology for realizing an PCI expansion adapter for a PC card which is connectable to a desktop type personal computer PCI expansion connector using a low profile PCI. The PCI expansion adapter includes an expansion unit which is provided with an electrical connector to a PCI bus, a low profile PCI expansion board provided with a PC card control element and an electrical connector to the PC card, wherein the low profile PCI expansion board and the expansion unit are connected by the electrical connectors mounted on the respective boards.

Abstract: There is provided a technology for realizing an PCI expansion adapter for a PC card which is connectable to a desktop type personal computer PCI expansion connector using a low profile PCI. The PCI expansion adapter includes an expansion unit which is provided with an electrical connector to a PCI bus, a low profile PCI expansion board provided with a PC card control element and an electrical connector to the PC card, wherein the low profile PCI expansion board and the expansion unit are connected by the electrical connectors mounted on the respective boards.

Abstract: A communication system is provided of selecting the most approximate line from two or more connectable lines and connecting with a provider through the selected line in the mobile communication environment. The mobile device and the public phone of each phone company provide a standard wireless data communication facility, respectively. The public line pre-stores information about dial-up numbers of access points and a transmission speed of an internet provider. When the user starts the communication, the mobile device operates to obtain the most approximate access point information from each of the public phones and then dial up the most approximate access point through the public phone/line well-specified to the user.