Other

Kabushiki Kaisha Toshiba

Fuji Xerox Co., Ltd.

Kyocera Corporation

Renesas Technology Corp.

Sony Corporation

Fujitsu Corporation

Nec Corporation

Matsushita Electric Industrial Co., Ltd.

Sharp Kabushiki Kaisha Corporation

Sanyo Electric Co., Ltd.

Renesas Electronics Corporation

Rohm Co., Ltd.

Oki Electric Industry Co., Ltd.

Fujikura Limited

Tamotsu Usami

Kanji Otsuka

Yutaka Akiyama

Chihiro Ueda

Tetsuya Higuchi

Masahiro Murakawa

Yuji Kasai

Eiichi Takahashi

Osamu Koyasu

Tsuneo Ito

Yuko Tanba

An antenna apparatus utilizing an aperture of transmission line, which is connected to a first transmission line having a predetermined characteristic impedance, includes a tapered line portion, and an aperture portion. The tapered line portion is connected to one end of the transmission line, and the tapered line portion includes a second transmission line including a pair of line conductors. The tapered line portion keeps a predetermined characteristic impedance constant and expands at least one of a width of the transmission line and an interval in a tapered shape at a predetermined taper angle. The aperture portion has a radiation aperture connected to one end of the tapered line portion. A size of one side of the aperture end plane of the aperture portion is set to be equal to or higher than a quarter wavelength of the minimum operating frequency of the antenna apparatus.

Antenna apparatus utilizing aperture of transmission line

Disclosed is an electrostatic discharge protection circuit capable of realizing speeding up of differential signals by reducing a capacitance of the circuit. Transmission lines are connected to an IN terminal and an IN Bar terminal and differential signals are input to the terminals. The ESD protection circuit is connected to the transmission lines and protects an internal circuit from a surge voltage applied to the IN terminal and the IN Bar terminal. A pair of transistors of the ESD protection circuit is formed in the same well. Thereby, when differential signals transit, charges in drains of the pair of transistors holding a state before a transition transfer in the same well. As a result, the capacitances in the drains of the pair of transistors are reduced with respect to the transition of differential signals so that the speeding up of differential signals can be realized.

Electrostatic discharge protection circuit and terminating resistor circuit

Apparatus for transmitting a digital signal within, for example, an integrated circuit includes a signal transmission line with a directional coupler at one or both ends. The directional coupler blocks the direct-current component of the digital signal while transmitting the alternating-current component, including enough higher harmonics to transmit a well-defined pulse waveform. A suitable directional coupler consists of two adjacent line pairs in materials with different dielectric constants. The apparatus may also include a driver of the inverter type, a receiver of the differential amplifier type, a terminating resistor, and a power-ground transmission line pair for supplying power to the driver. An all-metallic transmission-line structure is preferably maintained from the output interconnections in the driver to the input interconnections in the receiver.

Signal transmission apparatus and interconnection structure

A purpose of a high-speed signal transmission system of the present invention is to pass a high-speed digital signal through an outside-chip line exchanging a signal with a high speed LSI chip with a band higher than GHz. The high-speed signal transmission system of the present invention has a configuration of: insertion of a circuit for feeding back received information and adjusting a waveform at a sending side based on genetic algorithm; a device structure for automatically performing pump up and pump down of a transistor carrier; a transmission line of a wiring out of a transistor; and elimination of a common power source of a circuit.

High-speed signal transmission system

A differential signal transmission cable structure for transmitting differential signals having GHz frequency band in the present invention is provided with a differential signal transmission pair cableconnecting a driver circuitand a receiver circuit, for transmitting differential signals having GHz frequency band, and a power supply ground transmission pair cableconnecting ground and a first power supplyconnected to the driver circuit and ground and a second power supplyconnected to the receiver circuit. Further characteristic impedance of the differential signal transmission pair cable is matched to that of the driver circuit and the receiver circuit, thereby enabling TEM waves of differential signals having GHz frequency band transmission mode to be maintained when the differential signals are transmitted.

Transmission cable structure for GHz frequency band signals and connector used for transmission of GHz frequency band signals

A signal transmission bus system has a transmission line pair on which binary data values are indicated by the presence and absence of a complementary signal. A driver circuit opens and closes a current path that supplies the complementary signal to the transmission line pair. When this path is opened, the driver circuit closes a bypass current path, so that the driver circuit behaves as a direct-current circuit and does not generate power-supply and ground noise. A receiver that senses the presence and absence of the complementary signal on the transmission line pair includes a differential amplifier and a termination transistor coupled across the input terminals of the differential amplifier, to discharge the input capacitance of the differential amplifier so that high-speed signals can be sensed rapidly.

Driver circuit, receiver circuit, and signal transmission bus system

Growing community of inventors

Kokubunji-shi, Tokyo, Japan

Tamotsu Usami