Patents by Inventor Kazuma Sugiura
Kazuma Sugiura 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: 11515840Abstract: The present disclosure is to improve the power added efficiency of a power amplifier at high output power. The power amplifier includes: a first capacitor with a radio frequency signal input to one end thereof; a first transistor whose base is connected to the other end of the first capacitor to amplify the radio frequency signal; a bias circuit for supplying bias to the base of the first transistor; and a second capacitor with one end connected to the base of the first transistor and the other end connected to the emitter of the first transistor.Type: GrantFiled: June 9, 2020Date of Patent: November 29, 2022Assignee: MURATA MANUFACTURING CO., LTD.Inventors: Kazuo Watanabe, Satoshi Tanaka, Norio Hayashi, Kazuma Sugiura
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Publication number: 20200304070Abstract: The present disclosure is to improve the power added efficiency of a power amplifier at high output power. The power amplifier includes: a first capacitor with a radio frequency signal input to one end thereof; a first transistor whose base is connected to the other end of the first capacitor to amplify the radio frequency signal; a bias circuit for supplying bias to the base of the first transistor; and a second capacitor with one end connected to the base of the first transistor and the other end connected to the emitter of the first transistor.Type: ApplicationFiled: June 9, 2020Publication date: September 24, 2020Inventors: Kazuo Watanabe, Satoshi Tanaka, Norio Hayashi, Kazuma Sugiura
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Patent number: 10693418Abstract: The present disclosure is to improve the power added efficiency of a power amplifier at high output power. The power amplifier includes: a first capacitor with a radio frequency signal input to one end thereof; a first transistor whose base is connected to the other end of the first capacitor to amplify the radio frequency signal; a bias circuit for supplying bias to the base of the first transistor; and a second capacitor with one end connected to the base of the first transistor and the other end connected to the emitter of the first transistor.Type: GrantFiled: May 3, 2017Date of Patent: June 23, 2020Assignee: MURATA MANUFACTURING CO., LTD.Inventors: Kazuo Watanabe, Satoshi Tanaka, Norio Hayashi, Kazuma Sugiura
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Patent number: 10236828Abstract: A power amplifier has improved power added efficiency at high output power. The power amplifier includes: a first transistor for amplifying an input signal input to the base thereof and outputting the amplified signal from the collector thereof; a second transistor with power-supply voltage applied to the collector thereof to supply bias voltage or bias current from the emitter thereof to the base of the first transistor; a third transistor whose collector is connected to the collector of the first transistor to amplify the input signal input to the base thereof and output the amplified signal from a collector thereof; a fourth transistor whose base and collector are connected to supply bias from the emitter thereof to the base of the third transistor; and a first resistor with bias control voltage applied to one end thereof and the other end connected to the bases of the second and fourth transistors.Type: GrantFiled: August 23, 2017Date of Patent: March 19, 2019Assignee: MURATA MANUFACTURING CO., LTD.Inventors: Kazuma Sugiura, Takashi Yamada, Norio Hayashi, Satoshi Tanaka, Kenichi Shimamoto, Kazuo Watanabe
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Publication number: 20180041169Abstract: A power amplifier has improved power added efficiency at high output power. The power amplifier includes: a first transistor for amplifying an input signal input to the base thereof and outputting the amplified signal from the collector thereof; a second transistor with power-supply voltage applied to the collector thereof to supply bias voltage or bias current from the emitter thereof to the base of the first transistor; a third transistor whose collector is connected to the collector of the first transistor to amplify the input signal input to the base thereof and output the amplified signal from a collector thereof; a fourth transistor whose base and collector are connected to supply bias from the emitter thereof to the base of the third transistor; and a first resistor with bias control voltage applied to one end thereof and the other end connected to the bases of the second and fourth transistors.Type: ApplicationFiled: August 23, 2017Publication date: February 8, 2018Inventors: Kazuma Sugiura, Takashi Yamada, Norio Hayashi, Satoshi Tanaka, Kenichi Shimamoto, Kazuo Watanabe
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Patent number: 9768729Abstract: A power amplifier has improved power added efficiency at high output power. The power amplifier includes: a first transistor for amplifying an input signal input to the base thereof and outputting the amplified signal from the collector thereof; a second transistor with power-supply voltage applied to the collector thereof to supply bias voltage or bias current from the emitter thereof to the base of the first transistor; a third transistor whose collector is connected to the collector of the first transistor to amplify the input signal input to the base thereof and output the amplified signal from a collector thereof; a fourth transistor whose base and collector are connected to supply bias from the emitter thereof to the base of the third transistor; and a first resistor with bias control voltage applied to one end thereof and the other end connected to the bases of the second and fourth transistors.Type: GrantFiled: September 23, 2015Date of Patent: September 19, 2017Assignee: MURATA MANUFACTURING CO., LTD.Inventors: Kazuma Sugiura, Takashi Yamada, Norio Hayashi, Satoshi Tanaka, Kenichi Shimamoto, Kazuo Watanabe
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Publication number: 20170237400Abstract: The present disclosure is to improve the power added efficiency of a power amplifier at high output power. The power amplifier includes: a first capacitor with a radio frequency signal input to one end thereof; a first transistor whose base is connected to the other end of the first capacitor to amplify the radio frequency signal; a bias circuit for supplying bias to the base of the first transistor; and a second capacitor with one end connected to the base of the first transistor and the other end connected to the emitter of the first transistor.Type: ApplicationFiled: May 3, 2017Publication date: August 17, 2017Inventors: Kazuo Watanabe, Satoshi Tanaka, Norio Hayashi, Kazuma Sugiura
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Patent number: 9673763Abstract: The present disclosure is to improve the power added efficiency of a power amplifier at high output power. The power amplifier includes: a first capacitor with a radio frequency signal input to one end thereof; a first transistor whose base is connected to the other end of the first capacitor to amplify the radio frequency signal; a bias circuit for supplying bias to the base of the first transistor; and a second capacitor with one end connected to the base of the first transistor and the other end connected to the emitter of the first transistor.Type: GrantFiled: October 29, 2015Date of Patent: June 6, 2017Assignee: MURATA MANUFACTURING CO., LTD.Inventors: Kazuo Watanabe, Satoshi Tanaka, Norio Hayashi, Kazuma Sugiura
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Publication number: 20160134242Abstract: The present disclosure is to improve the power added efficiency of a power amplifier at high output power. The power amplifier includes: a first capacitor with a radio frequency signal input to one end thereof; a first transistor whose base is connected to the other end of the first capacitor to amplify the radio frequency signal; a bias circuit for supplying bias to the base of the first transistor; and a second capacitor with one end connected to the base of the first transistor and the other end connected to the emitter of the first transistor.Type: ApplicationFiled: October 29, 2015Publication date: May 12, 2016Inventors: Kazuo Watanabe, Satoshi Tanaka, Norio Hayashi, Kazuma Sugiura
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Publication number: 20160134241Abstract: A power amplifier has improved power added efficiency at high output power. The power amplifier includes: a first transistor for amplifying an input signal input to the base thereof and outputting the amplified signal from the collector thereof; a second transistor with power-supply voltage applied to the collector thereof to supply bias voltage or bias current from the emitter thereof to the base of the first transistor; a third transistor whose collector is connected to the collector of the first transistor to amplify the input signal input to the base thereof and output the amplified signal from a collector thereof; a fourth transistor whose base and collector are connected to supply bias from the emitter thereof to the base of the third transistor; and a first resistor with bias control voltage applied to one end thereof and the other end connected to the bases of the second and fourth transistors.Type: ApplicationFiled: September 23, 2015Publication date: May 12, 2016Inventors: Kazuma Sugiura, Takashi Yamada, Norio Hayashi, Satoshi Tanaka, Kenichi Shimamoto, Kazuo Watanabe