Ohbu
Isao Ohbu, Sagamihara JP
Patent application number | Description | Published |
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20100032720 | SEMICONDUCTOR DEVICE AND RADIO COMMUNICATION DEVICE - A technology which allows a reduction in the thermal resistance of a semiconductor device and the miniaturization thereof is provided. The semiconductor device has a plurality of unit transistors Q, transistor formation regions | 02-11-2010 |
20100327980 | HETEROJUNCTION BIPOLAR TRANSISTOR AND METHOD FOR MANUFACTURING THE SAME, AND POWER AMPLIFIER USING THE SAME - A heterojunction bipolar transistor with InGaP as the emitter layer and capable of both reliable electrical conduction and thermal stability wherein a GaAs layer is inserted between the InGaP emitter layer and AlGaAs ballast resistance layer, to prevent holes reverse-injected from the base layer from diffusing and reaching the AlGaAs ballast resistance layer. | 12-30-2010 |
20120261799 | SEMICONDUCTOR DEVICE AND RADIO COMMUNICATION DEVICE - A technology which allows a reduction in the thermal resistance of a semiconductor device used in a radio communication device, and the miniaturization thereof is provided. For example, the semiconductor device can include a plurality of unit transistors Q, transistor formation regions | 10-18-2012 |
20140361406 | SEMICONDUCTOR DEVICE AND RADIO COMMUNICATION DEVICE - A radio communication device includes a power amplifier having a semiconductor device formed with a plurality of unit transistors. Base electrodes of the unit transistors are connected with each other by a base line, and an input capacitor is connected to the base line such that the input capacitor is commonly and electrically connected to the base electrodes of a plurality of the unit transistors. | 12-11-2014 |
Takayuki Ohbu, Isesaki JP
Patent application number | Description | Published |
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20090157282 | Air-Fuel Ratio Control Apparatus by Sliding Mode Control of Engine - Factors affecting the response time of a transfer system from the combustion of injected fuel to the detection of its oxygen concentration include a stroke delay time due to an engine speed, the dependence of an LAF sensor response time on an exhaust gas flow rate, a response time change of the LAF sensor due to its deterioration with time, and the like. If a hyperplane of the sliding mode is fixed without considering the above-mentioned factors affecting the response time of the transfer system, an overshoot or oscillation of a feedback system may occur at low speeds of the engine even if preferable feedback responsiveness can be achieved, for example, at high speeds of the engine. This results in aggravated exhaust emissions, degraded drivability due to torque fluctuations, and fluctuations in idle speed. | 06-18-2009 |
Toshiharu Ohbu, Kawasaki Kanagawa JP
Patent application number | Description | Published |
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20160057881 | SEMICONDUCTOR DEVICE - A semiconductor device includes a base plate, a semiconductor chip, and a first to a fourth terminal plates. The first terminal plate includes a first main body unit. The second terminal plate includes a second main body unit. The second main body unit opposes the first main body unit. The third terminal plate includes a third main body unit. The third main body unit opposes the first main body unit and the second main body unit. The fourth terminal plate includes a fourth main body unit. The fourth main body unit opposes the third main body unit. A thickness of the third main body unit is thinner than a thickness of the first main body unit. A thickness of the fourth main body unit is thinner than a thickness of the second main body unit. | 02-25-2016 |