Mitsubishi Electric Corporation

Satoru Ishizaka

Masatoshi Nakayama

Takashi Kumagai

Takahiro Ito

Hajime Nakatani

Taichiro Tamida

Kenji Shimohata

Hiroyuki Kimata

Kenichi Horiguchi

Yoshiaki Odai

Kazuhisa Yamauchi

Tomokazu Hamada

Yasuhiro Onaka

Yoshiyuki Kusano

Toshihiro Yoshida

Daisuke Takauchi

Toshio Anzai

Hisashi Hirokawa

Seigo Inobe

Hiroki Shionoya

Masatoshi Toyonaga

Yoshimitsu Tawarayama

Keiji Ninomiya

Keita Fujimaru

Yoko Toda

In a circuit board (A), a first capacitor () extends from a wiring pattern () to a region located on one side of the wiring pattern () in the width direction. A second capacitor () extends from the wiring pattern () to a region located on the other side of the wiring pattern () in the width direction. With a semiconductor device () mounted on the circuit board (A), a power supply terminal () is electrically connected to the wiring pattern (). The semiconductor device (), the wiring pattern (), the first capacitor (), a first interlayer joint (), a ground plane (), and a third interlayer joint () constitute a first closed circuit. The semiconductor device (), the wiring pattern (), the second capacitor (), a second interlayer joint (), the ground plane (), and the third interlayer joint () constitute a second closed circuit.

Circuit board

An AD conversion apparatus includes an AD conversion unit; a reference voltage switching unit that is disposed between an output of a sensor and an analog input terminal of the AD conversion unit and is connectable to the output of the sensor and a plurality of reference voltage lines; and a control unit to control switching the reference voltage input to the AD conversion unit by connecting the reference voltage switching unit to one of the reference voltage lines and to the output of the sensor. An analog output value of the sensor is input to the analog input terminal of the AD conversion unit via the reference voltage switching unit and is converted into a digital value.

Analog-to-digital conversion apparatus and analog-to-digital conversion method

A digital output circuit to be driven by an insulated power-supply circuit includes a transistor to turn on/off an external power supply in accordance with a signal output by a light receiving element in an insulating circuit in response to a signal processed by a controller. The external supply is connected to an output device. The output circuit includes a switching unit having first and second mechanisms to switch each of wires between a connected state and a non-connected state at two places between the light receiving element and the source or emitter of the transistor, and a logic adjusting unit to adjust inversion of a logic output of the light receiving element in correspondence to the type of the transistor, such that the output circuit is switched between a sink-current type and a source-current type.

Digital output circuit, printed-wiring board, and industrial apparatus

A transmission circuit, mounted on a printed board and having attenuation characteristics, to attenuate an amplitude of a reception signal according to the attenuation characteristics, and to transmit the amplitude-attenuated reception signal, as an attenuation signal; and a correction circuit, mounted on the printed board and having correction characteristics, to attenuate an attenuation signal that has been received from the transmission circuit according to the correction characteristics, and to transmit the attenuation signal attenuated, as a correction signal are provided. The attenuation characteristics are such characteristics that the ratio of the amplitude of the attenuation signal to the amplitude of the reception signal decreases as the frequency of the reception signal increases. The correction characteristics are characteristics with which the ratio of the amplitude of the correction signal to the amplitude of the attenuation signal increases as the frequency of the attenuation signal increases.

Processing circuit and signal correction method

An electronic device comprises a plurality of printed circuit boards having signal GNDs, a metal bar which electrically connects to the respective signal GNDs of the plurality of printed circuit boards, and a card basket which houses the plurality of printed circuit boards and the metal bar and serves as a frame GND. The electronic device also comprises a dielectric between the card basket and the metal bar. The metal bar, the card basket, and the dielectric constitute a noise control capacitor having specific frequency characteristics. By the specific frequency characteristics, the noise control capacitor releases electromagnetic noise occurring in the respective signal GNDs to an outside and shields external noise generated outside.

Electronic device and electromagnetic noise control method

When static electrical charge by electromagnetic waves is applied to a test-target board or test noises are applied to the ground of the test-target board, a test device tests as to whether or not noises are conducted through a path from an OUT terminal of an amplifier circuit to the ground of the test-target board, and a test device tests as to whether or not noises are conducted through a path from an OUT terminal of an amplifier circuit to the ground of the test-target board together with the number of conductions.

Test device, test method, and program

A directional coupler capable of improving a directionality of a directional coupler body including four terminals. The directional coupler includes a directional coupler body including the four terminals of an input port, an output port, a coupling port, and an isolation port; and a combiner for combining powers of an output signal of the coupling port and an output signal of the isolation port of the directional coupler body; and a directionality improving circuit for amplifying or attenuating at least one of the output signal of the coupling port and the output signal of the isolation port before outputting the same, and the combiner combines powers of the output signals amplified or attenuated by the directionality improving circuit.

Directional coupler

When an input signal level is small, the electrical length of a phase lineand the electrical length of a phase lineare set in such a manner that the impedance seen by looking into the output side from an impedance reference pointat the output side of a carrier amplifierbecomes 2R+&#x3b1; (where R is a load resistance and &#x3b1; is positive), and the electrical length of a phase lineis set at a difference between the electrical length of the phase lineand the electrical length of the phase line

High efficiency amplifier

Growing community of inventors

Tokyo, Japan

Satoru Ishizaka