Patents by Inventor Takashi Soga
Takashi Soga has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 10148226Abstract: A bias circuit includes first to fourth bipolar transistors and a filter circuit. The third bipolar transistor supplies a bias signal to an amplifier. The filter circuit is connected between a collector terminal of the first bipolar transistor and the ground through a base terminal of the first bipolar transistor. The filter circuit has frequency characteristics for attenuating a high frequency component of an RF signal to be input to the amplifier.Type: GrantFiled: December 7, 2017Date of Patent: December 4, 2018Assignee: MURATA MANUFACTURING CO., LTD.Inventor: Takashi Soga
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Patent number: 10135395Abstract: A power amplifier circuit includes a first transistor, a second transistor, a first bias circuit supplying a first bias current or voltage, a second bias circuit supplying a second bias current or voltage, a first inductor, and a first capacitor. A power supply voltage is supplied to a collector of the first transistor, and an emitter thereof is grounded. A radio frequency signal and the first bias current or voltage are supplied to a base of the first transistor. The power supply voltage is supplied to a collector of the second transistor, and an emitter thereof is connected to the collector of the first transistor via the first capacitor and is grounded via the first inductor. The second bias current or voltage is supplied to a base of the second transistor. An amplified radio frequency signal is output from the collector of the second transistor.Type: GrantFiled: November 22, 2017Date of Patent: November 20, 2018Assignee: MURATA MANUFACTURING CO., LTD.Inventors: Satoshi Tanaka, Masatoshi Hase, Yuri Honda, Kazuo Watanabe, Takashi Soga
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Publication number: 20180294788Abstract: Provided is a power amplification module that includes: an amplification transistor that has a constant power supply voltage supplied to a collector thereof, a bias current supplied to a base thereof and that amplifies an input signal input to the base thereof and outputs an amplified signal from the collector thereof; a first current source that outputs a first current that corresponds to a level control voltage that is for controlling a signal level of the amplified signal; and a bias transistor that has the first current supplied to a collector thereof, a bias control voltage connected to a base thereof and that outputs the bias current from an emitter thereof.Type: ApplicationFiled: June 13, 2018Publication date: October 11, 2018Inventors: Shota Ishihara, Yusuke Shimamune, Takashi Soga, Fuminori Morisawa, Seiko Ono, Tetsuaki Adachi
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Publication number: 20180287562Abstract: A power amplifier circuit includes a first transistor, a second transistor, a first bias circuit supplying a first bias current or voltage, a second bias circuit supplying a second bias current or voltage, a first inductor, and a first capacitor. A power supply voltage is supplied to a collector of the first transistor, and an emitter thereof is grounded. A radio frequency signal and the first bias current or voltage are supplied to a base of the first transistor. The power supply voltage is supplied to a collector of the second transistor, and an emitter thereof is connected to the collector of the first transistor via the first capacitor and is grounded via the first inductor. The second bias current or voltage is supplied to a base of the second transistor. An amplified radio frequency signal is output from the collector of the second transistor.Type: ApplicationFiled: June 6, 2018Publication date: October 4, 2018Inventors: Satoshi Tanaka, Masatoshi Hase, Yuri Honda, Kazuo Watanabe, Takashi Soga
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Patent number: 10020786Abstract: Provided is a power amplification module that includes: an amplification transistor that has a constant power supply voltage supplied to a collector thereof, a bias current supplied to a base thereof and that amplifies an input signal input to the base thereof and outputs an amplified signal from the collector thereof; a first current source that outputs a first current that corresponds to a level control voltage that is for controlling a signal level of the amplified signal; and a bias transistor that has the first current supplied to a collector thereof, a bias control voltage connected to a base thereof and that outputs the bias current from an emitter thereof.Type: GrantFiled: July 5, 2016Date of Patent: July 10, 2018Assignee: MURATA MANUFACTURING CO., LTD.Inventors: Shota Ishihara, Yusuke Shimamune, Takashi Soga, Fuminori Morisawa, Seiko Ono, Tetsuaki Adachi
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Publication number: 20180167035Abstract: A bias circuit includes first to fourth bipolar transistors and a filter circuit. The third bipolar transistor supplies a bias signal to an amplifier. The filter circuit is connected between a collector terminal of the first bipolar transistor and the ground through a base terminal of the first bipolar transistor. The filter circuit has frequency characteristics for attenuating a high frequency component of an RF signal to be input to the amplifier.Type: ApplicationFiled: December 7, 2017Publication date: June 14, 2018Inventor: Takashi Soga
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Publication number: 20180152143Abstract: A power amplifier circuit includes a first transistor, a second transistor, a first bias circuit supplying a first bias current or voltage, a second bias circuit supplying a second bias current or voltage, a first inductor, and a first capacitor. A power supply voltage is supplied to a collector of the first transistor, and an emitter thereof is grounded. A radio frequency signal and the first bias current or voltage are supplied to a base of the first transistor. The power supply voltage is supplied to a collector of the second transistor, and an emitter thereof is connected to the collector of the first transistor via the first capacitor and is grounded via the first inductor. The second bias current or voltage is supplied to a base of the second transistor. An amplified radio frequency signal is output from the collector of the second transistor.Type: ApplicationFiled: November 22, 2017Publication date: May 31, 2018Inventors: Satoshi Tanaka, Masatoshi Hase, Yuri Honda, Kazuo Watanabe, Takashi Soga
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Publication number: 20170019082Abstract: Provided is a power amplification module that includes: an amplification transistor that has a constant power supply voltage supplied to a collector thereof, a bias current supplied to a base thereof and that amplifies an input signal input to the base thereof and outputs an amplified signal from the collector thereof; a first current source that outputs a first current that corresponds to a level control voltage that is for controlling a signal level of the amplified signal; and a bias transistor that has the first current supplied to a collector thereof, a bias control voltage connected to a base thereof and that outputs the bias current from an emitter thereof.Type: ApplicationFiled: July 5, 2016Publication date: January 19, 2017Inventors: Shota Ishihara, Yusuke Shimamune, Takashi Soga, Fuminori Morisawa, Seiko Ono, Tetsuaki Adachi
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Patent number: 9240760Abstract: A power amplifier module includes a first amplification transistor that amplifies and outputs a radio frequency signal, a second amplification transistor that is connected in parallel to the first amplification transistor and that has a smaller size than the first amplification transistor, a bias circuit that supplies a bias voltage or a bias current to the first and second amplification transistors, a current detector circuit that detects a current flowing in the second amplification transistor, and a bias control circuit that controls the bias voltage or the bias current supplied from the bias circuit to the first and second amplification transistors depending on the detection result of the current detector circuit.Type: GrantFiled: November 13, 2014Date of Patent: January 19, 2016Assignee: MURATA MANUFACTURING CO., LTD.Inventors: Kazuhiko Ishimoto, Takashi Soga
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Publication number: 20150070092Abstract: A power amplifier module includes a first amplification transistor that amplifies and outputs a radio frequency signal, a second amplification transistor that is connected in parallel to the first amplification transistor and that has a smaller size than the first amplification transistor, a bias circuit that supplies a bias voltage or a bias current to the first and second amplification transistors, a current detector circuit that detects a current flowing in the second amplification transistor, and a bias control circuit that controls the bias voltage or the bias current supplied from the bias circuit to the first and second amplification transistors depending on the detection result of the current detector circuit.Type: ApplicationFiled: November 13, 2014Publication date: March 12, 2015Inventors: Kazuhiko Ishimoto, Takashi Soga
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Patent number: 8314655Abstract: The RF power amplifier circuit including multiple amplification stages has a previous-stage amplifier, a next-stage amplifier and a controller. The previous-stage amplifier responds to an RF transmission input signal. The next-stage amplifier responds to an amplification signal output by the previous-stage amplifier. In response to an output-power-control voltage, the controller controls the former- and next-stage amplifiers in quiescent current and gain. In response to the output-power-control voltage, the quiescent current and gain of the previous-stage amplifier are continuously changed according to a first continuous function, whereas those of the next-stage amplifier are continuously changed according to a second continuous function. The second continuous function is higher than the first continuous function by at least one in degree. The RF power amplifier circuit brings about the effect that the drop of the power added efficiency in low and middle power modes is relieved.Type: GrantFiled: January 9, 2012Date of Patent: November 20, 2012Assignee: Renesas Electronics CorporationInventors: Masatoshi Hase, Masahiro Ito, Takashi Soga, Satoshi Tanaka
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Publication number: 20120112838Abstract: The RF power amplifier circuit including multiple amplification stages has a previous-stage amplifier, a next-stage amplifier and a controller. The previous-stage amplifier responds to an RF transmission input signal. The next-stage amplifier responds to an amplification signal output by the previous-stage amplifier. In response to an output-power-control voltage, the controller controls the former- and next-stage amplifiers in quiescent current and gain. In response to the output-power-control voltage, the quiescent current and gain of the previous-stage amplifier are continuously changed according to a first continuous function, whereas those of the next-stage amplifier are continuously changed according to a second continuous function. The second continuous function is higher than the first continuous function by at least one in degree. The RF power amplifier circuit brings about the effect that the drop of the power added efficiency in low and middle power modes is relieved.Type: ApplicationFiled: January 9, 2012Publication date: May 10, 2012Applicant: RENESAS ELECTRONICS CORPORATIONInventors: Masatoshi HASE, Masahiro ITO, Takashi SOGA, Satoshi TANAKA
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Patent number: 8098102Abstract: The RF power amplifier circuit including multiple amplification stages has a previous-stage amplifier, a next-stage amplifier and a controller. The previous-stage amplifier responds to an RF transmission input signal. The next-stage amplifier responds to an amplification signal output by the previous-stage amplifier. In response to an output-power-control voltage, the controller controls the former- and next-stage amplifiers in quiescent current and gain. In response to the output-power-control voltage, the quiescent current and gain of the previous-stage amplifier are continuously changed according to a first continuous function, whereas those of the next-stage amplifier are continuously changed according to a second continuous function. The second continuous function is higher than the first continuous function by at least one in degree. The RF power amplifier circuit brings about the effect that the drop of the power added efficiency in low and middle power modes is relieved.Type: GrantFiled: January 29, 2010Date of Patent: January 17, 2012Assignee: Renesas Electronics CorporationInventors: Masatoshi Hase, Masahiro Ito, Takashi Soga, Satoshi Tanaka
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Patent number: 7961229Abstract: A digital still camera includes a lens system. A cold mirror separates object light incident on the lens system into a visible light component and an infrared component. A visible light image sensor outputs a first image signal of a visible light image by receiving the visible light component. An infrared light image sensor outputs a second image signal of an infrared image by receiving the infrared component. A contour signal generator extracts a high frequency component from a luminance signal determined according to the second image signal, to produce an edge enhancement signal. An adder adds the edge enhancement signal to a luminance signal determined according to the first image signal. Addition of the edge enhancement signal is adapted to the object light from an object at a far distance. Specifically, the cold mirror reflects the visible light component and transmits the infrared component.Type: GrantFiled: March 30, 2008Date of Patent: June 14, 2011Assignee: FUJIFILM CorporationInventor: Takashi Soga
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Publication number: 20100194481Abstract: The RF power amplifier circuit including multiple amplification stages has a previous-stage amplifier, a next-stage amplifier and a controller. The previous-stage amplifier responds to an RF transmission input signal. The next-stage amplifier responds to an amplification signal output by the previous-stage amplifier. In response to an output-power-control voltage, the controller controls the former- and next-stage amplifiers in quiescent current and gain. In response to the output-power-control voltage, the quiescent current and gain of the previous-stage amplifier are continuously changed according to a first continuous function, whereas those of the next-stage amplifier are continuously changed according to a second continuous function. The second continuous function is higher than the first continuous function by at least one in degree. The RF power amplifier circuit brings about the effect that the drop of the power added efficiency in low and middle power modes is relieved.Type: ApplicationFiled: January 29, 2010Publication date: August 5, 2010Applicant: RENESAS TECHNOLOGY CORP.Inventors: Masatoshi HASE, Masahiro ITO, Takashi SOGA, Satoshi TANAKA
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Publication number: 20090290859Abstract: The present invention provides an image pickup device having: an image pickup component, a focal length computing component, a shutter speed computing component, a camera shake correction judging component, and a camera shake correcting component. The focal length computing component computes a focal length of an optical system. The shutter speed computing component computes a shutter speed of the image pickup component. At a time when the shutter speed computed by the shutter speed computing component is greater than a reciprocal of the focal length computed by the focal length computing component, the camera shake correction judging component judges that camera shake correction is to be carried out, and, at a time when the shutter speed is less than or equal to the reciprocal of the focal length, the camera shake correction judging component judges that camera shake correction is not to be carried out.Type: ApplicationFiled: May 18, 2006Publication date: November 26, 2009Applicant: FUJIFILM CorporationInventor: Takashi Soga
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Patent number: 7456864Abstract: A digital camera comprises an angular velocity detector for detecting angular velocity of a camera body in a yaw direction and a pitch direction. In capturing panoramic image, when movement of the camera body is detected, a system controller determines an image capturing interval based on the detected angular velocity in the yaw direction, and controls a CCD image sensor to perform plural times of image capturing at the determined image capturing interval. The system controller temporarily stores the captured image data for the plural images in a buffer memory, and controls an image signal processor based on the angular velocity in the pitch direction and the image-capturing interval so as to compose the image data for the plural images to form a single panoramic image.Type: GrantFiled: April 21, 2005Date of Patent: November 25, 2008Assignee: Fujifilm CorporationInventor: Takashi Soga
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Publication number: 20080239091Abstract: A digital still camera includes a lens system. A cold mirror separates object light incident on the lens system into a visible light component and an infrared component. A visible light image sensor outputs a first image signal of a visible light image by receiving the visible light component. An infrared light image sensor outputs a second image signal of an infrared image by receiving the infrared component. A contour signal generator extracts a high frequency component from a luminance signal determined according to the second image signal, to produce an edge enhancement signal. An adder adds the edge enhancement signal to a luminance signal determined according to the first image signal. Addition of the edge enhancement signal is adapted to the object light from an object at a far distance. Specifically, the cold mirror reflects the visible light component and transmits the infrared component.Type: ApplicationFiled: March 30, 2008Publication date: October 2, 2008Applicant: FUJIFILM CorporationInventor: Takashi Soga
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Patent number: 7362367Abstract: It is an object of the present invention to provide a digital camera that forms, on a solid state imaging device, an object image resulting from object light transmitted via a photographing optical system, to obtain image data representative of the object image, the digital camera enabling a photographer to take his or her intended photograph accurately. After a composition determining operation has been finished and before an actual photographing operation is started, an image display section displays a composition and a through image in a superimposing manner. The distance to an object is measured when the composition determining operation is performed. During the actual photographing operation, focusing is carried out in accordance with the distance measured when the composition determining operation is performed.Type: GrantFiled: September 17, 2003Date of Patent: April 22, 2008Assignee: Fujifilm CorporationInventor: Takashi Soga
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Patent number: 7333564Abstract: The present invention provides a high frequency power amplifier circuit capable of obtaining sufficient detection output even in a range where a request output power level is low and performing a desired output power control by a control loop with the detection output in a radio communication system which detects output power and performs feedback control. An output power detection circuit which detects the level of output power on the basis of an AC signal supplied from a final amplification stage of a high frequency power amplification circuit via a capacitive element has a circuit configuration such that in a state where the output power control voltage is lower than a certain level, current (Isu) according to the output power control voltage is generated and supplied to the output power detection circuit, and detection sensitivity of the output power detection circuit improves according to the current.Type: GrantFiled: December 30, 2004Date of Patent: February 19, 2008Assignee: Renesas Technology Corp.Inventors: Hiroki Sugiyama, Takashi Soga, Yusuke Shimamune, Shuji Tomono, Tomio Furuya, Kyoichi Takahashi