Patents by Inventor Hiroyasu Shimaoka
Hiroyasu Shimaoka 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: 7053695Abstract: There is provided a current source circuit in which a outflow current of an output terminal is equal to an inflow current thereof. The current source circuit includes a first transistor group converting a reference current from a reference current source into a voltage and a first transistor having a current mirror relationship with the first transistor group, and allowing an output current to flow therethrough. An error amplifier compares a voltage generated in the first transistor group and supplied to one input terminal with a voltage supplied to the other input terminal. A second transistor is driven with an output voltage of the error amplifier. A third transistor is driven with the output voltage of the error amplifier, and allows an output current to flow therethrough in a direction opposite to the output current of the first transistor with respect to an output terminal.Type: GrantFiled: June 8, 2005Date of Patent: May 30, 2006Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Masayuki Ozasa, Hiroyasu Shimaoka
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Patent number: 7046077Abstract: There is provided a current source circuit in which a outflow current of an output terminal is equal to an inflow current thereof. The current source circuit includes a first transistor group converting a reference current from a reference current source into a voltage and a first transistor having a current mirror relationship with the first transistor group, and allowing an output current to flow therethrough. An error amplifier compares a voltage generated in the first transistor group and supplied to one input terminal with a voltage supplied to the other input terminal. A second transistor is driven with an output voltage of the error amplifier. A third transistor is driven with the output voltage of the error amplifier, and allows an output current to flow therethrough in a direction opposite to the output current of the first transistor with respect to an output terminal.Type: GrantFiled: February 10, 2005Date of Patent: May 16, 2006Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Masayuki Ozasa, Hiroyasu Shimaoka
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Publication number: 20050225381Abstract: There is provided a current source circuit in which a outflow current of an output terminal is equal to an inflow current thereof. The current source circuit includes a first transistor group converting a reference current from a reference current source into a voltage and a first transistor having a current mirror relationship with the first transistor group, and allowing an output current to flow therethrough. An error amplifier compares a voltage generated in the first transistor group and supplied to one input terminal with a voltage supplied to the other input terminal. A second transistor is driven with an output voltage of the error amplifier. A third transistor is driven with the output voltage of the error amplifier, and allows an output current to flow therethrough in a direction opposite to the output current of the first transistor with respect to an output terminal.Type: ApplicationFiled: June 8, 2005Publication date: October 13, 2005Applicant: Matsushita Electric Industrial Co., Ltd.Inventors: Masayuki Ozasa, Hiroyasu Shimaoka
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Publication number: 20050134366Abstract: There is provided a current source circuit in which a outflow current of an output terminal is equal to an inflow current thereof. The current source circuit includes a first transistor group converting a reference current from a reference current source into a voltage and a first transistor having a current mirror relationship with the first transistor group, and allowing an output current to flow therethrough. An error amplifier compares a voltage generated in the first transistor group and supplied to one input terminal with a voltage supplied to the other input terminal. A second transistor is driven with an output voltage of the error amplifier. A third transistor is driven with the output voltage of the error amplifier, and allows an output current to flow therethrough in a direction opposite to the output current of the first transistor with respect to an output terminal.Type: ApplicationFiled: February 10, 2005Publication date: June 23, 2005Applicant: Matsushita Electric Industrial Co., Ltd.Inventors: Masayuki Ozasa, Hiroyasu Shimaoka
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Publication number: 20040160268Abstract: There is provided a current source circuit in which a outflow current of an output terminal is equal to an inflow current thereof. The current source circuit includes a first transistor group converting a reference current from a reference current source into a voltage and a first transistor having a current mirror relationship with the first transistor group, and allowing an output current to flow therethrough. An error amplifier compares a voltage generated in the first transistor group and supplied to one input terminal with a voltage supplied to the other input terminal. A second transistor is driven with an output voltage of the error amplifier. A third transistor is driven with the output voltage of the error amplifier, and allows an output current to flow therethrough in a direction opposite to the output current of the first transistor with respect to an output terminal.Type: ApplicationFiled: December 8, 2003Publication date: August 19, 2004Applicant: Matsushita Electric Industrial Co., Ltd.Inventors: Masayuki Ozasa, Hiroyasu Shimaoka
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Patent number: 6023305Abstract: A primary color video output circuit for limiting an input video signal. The circuit includes a clipping circuit, a reference voltage generating circuit and an amplifier. The clipping circuit limits the level of the input video signal based on a reference voltage generated by the reference voltage generating circuit. The amplifier is then used to amplify the clipped video signal.Type: GrantFiled: June 10, 1997Date of Patent: February 8, 2000Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Hiroshi Ando, Nobuo Taketani, Tsuneo Matsukura, Hiroyasu Shimaoka, Hitoshi Adachi, Yoichi Kanegami, Hiroki Kinugawa
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Patent number: 5956095Abstract: A noise suppression apparatus suppresses noise of a luminance signal, for example, at a fringe of area of reception in a television receiver. The noise suppression apparatus includes a tuner circuit, an intermediate frequency amplification circuit, a video detection/amplification circuit, an AGC detection/amplification circuit, an RF AGC circuit, a sound/chrominance signal separation circuit, a luminance signal processing circuit and a luminance signal noise suppression circuit.Type: GrantFiled: May 30, 1997Date of Patent: September 21, 1999Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Nobuo Taketani, Hiroshi Ando, Tsuneo Matsukura, Hiroyasu Shimaoka, Hitoshi Adachi