Abstract: A design check method executed by a computer includes determining a countermeasure component provided in a certain range from a terminal of a reference component, determining whether a terminal of the determined countermeasure component is electrically connected to the terminal of the reference component, and determining that the countermeasure component is suitably mounted when the terminal of the determined countermeasure component that is electrically connected to the terminal of the reference component is at least within the certain range.

Abstract: A printed circuit board design assisting device includes a frame ground extraction section that extracts a ground pattern that is provided in a surface layer of a printed circuit board and that is to be connected to a metal component from design data on the printed circuit board stored in a design data storage section to store information for specifying the ground pattern in a data storage section, an electrostatic discharge determination section that performs a determination as to electrostatic discharge for the ground pattern specified from the information stored in the data storage section to store a determination result in a determination result storage section, and an output section that outputs the determination result stored in the determination result storage section.

Abstract: An internal circuit generates a digital signal according to an electric signal received from outside, and outputs the digital signal to an output signal line. An output circuit sets a voltage value of the digital signal to a prescribed value. A drive signal input circuit inputs a drive signal received from outside through a drive signal input terminal to the output circuit, and drives the output circuit independent of the digital signal according to the drive signal.

Abstract: A radio communication apparatus includes a transmission clock signal generation part, when a harmonic component of a first clock signal used by a clock signal using part agrees with a reception frequency of the radio communication apparatus, generating a second clock signal different from the first clock signal; a clock signal transmission part transmitting the second clock signal, generated by the transmission clock signal generation part, for the clock signal using part, and a use clock signal generation part generating the first clock signal from the second clock signal, transmitted by the clock signal transmission part, and provide the generated first clock signal to the clock signal using part.

Abstract: A first power supply layer spreads over an insulating layer outside an island of a second power supply layer. A first ground layer spreads over an insulating layer outside an island of a second ground layer. First and second electrically-conductive pieces are interposed between the first and second power supply layers as well as between the first and second ground layers. A capacitor is interposed between the first and second electrically-conductive pieces. Power supply noise is forced to inevitably pass through the electrically-conductive pieces. The power supply noise thus reliably flows into the capacitor through the first and second electrically-conductive pieces. A printed wiring board is in this manner allowed to enjoy a sufficient suppression of the power supply noise.

Abstract: An electric apparatus includes a plurality of circuit blocks, a plurality of power sources; and a plurality of power input portions receiving power in one-to-one correspondence with the plurality of circuit blocks, wherein the power sources are located in proximity to the power input portions and are connected to the power input portions.

Abstract: A first power supply layer spreads over an insulating layer outside an island of a second power supply layer. A first ground layer spreads over an insulating layer outside an island of a second ground layer. First and second electrically-conductive pieces are interposed between the first and second power supply layers as well as between the first and second ground layers. A capacitor is interposed between the first and second electrically-conductive pieces. Power supply noise is forced to inevitably pass through the electrically-conductive pieces. The power supply noise thus reliably flows into the capacitor through the first and second electrically-conductive pieces. A printed wiring board is in this manner allowed to enjoy a sufficient suppression of the power supply noise.

Abstract: A device accurately calculates the strength of an electromagnetic field radiated from an electric circuit apparatus having a data receiving unit, and extractor, a model generator, and a calculator. The data receiving unit receives structural data related to the electric circuit apparatus. The extractor exacts, from the received data, structural data related to a dielectric between a power source layer and a ground layer of a multilayer printed board.

Abstract: A multilayer printed board has at least a signal layer, a power source layer, and a ground layer that are formed one upon another with insulation material being interposed among the layers. The board is capable of reducing radio waves to be emitted from the board.The board is provided with capacitors that are continuously or discretely formed at the edges of an overlapping pattern of the power source layer and ground layer, to pass a high-frequency current from the power source layer to the ground layer, thereby reducing the emission of radio waves.

Abstract: An electromagnetic field intensity calculating device simulates the intensity of the electromagnetic field generated by an electric circuit, and performs a required simulation process at a high speed. That is, the electromagnetic field intensity calculating device simulates the electromagnetic field intensity generated by an object electric circuit device by processing an object frequency generated by the object electric circuit device. The electromagnetic field intensity calculating device comprises a calculating unit for calculating the resonant frequency of the object electric circuit device and a retrieving unit for retrieving from a plurality of object frequencies a harmonic frequency of a wave source approximate to the resonant frequency calculated by the calculating unit so that the electromagnetic field intensity can be simulated on the frequency retrieved by the retrieving unit.

Abstract: A testing device includes a pickup for picking up an electromagnetic emission from a computer system, a detector for detecting the electromagnetic emission, a first connector adapted for connection to a computer for receiving a synchronization signal from the computer, a transmission path for transmitting the synchronization signal therethrough from the first end to a second end, and a second connector provided on the second end of the transmission path for connection to a display device, for supplying the synchronization signal and the output signal of the detection means to the display device.

Abstract: A testing apparatus for detecting an image from an image signal in radio waves leaking from an information processing system. The information processing system uses horizontal and vertical synchronizing signals to display the image. The testing apparatus includes a radio wave receiving mechanism which receives the radio waves. An image signal detecting mechanism detects the image signal from the received radio waves and a synchronizing signal receiving mechanism receives the horizontal and vertical synchronizing signals from the information processing system. An image reproducing mechanism reproduces the image from the detected image signal by using the received horizontal and vertical synchronizing signals and a display device is used to display the reproduced image.