Patents by Inventor Kiyohiko Takahashi

Kiyohiko Takahashi 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).

  • Patent number: 9887670
    Abstract: A power supply circuit (10) includes: a linear amplifier (11) for generating a linear amplification signal based on an input signal; a first switching amplifier (12) for generating a first switching amplification signal of a first frequency band based on the linear amplification signal; a second switching amplifier (13) for generating a second switching amplification signal of a second frequency band based on the first switching amplification signal; and a power supply unit (14) for supplying a combined signal in which the linear amplification signal and the first and second switching amplification signals are combined to an external circuit as a power supply. It is therefore possible to improve the power efficiency.
    Type: Grant
    Filed: May 9, 2014
    Date of Patent: February 6, 2018
    Assignee: NEC CORPORATION
    Inventor: Kiyohiko Takahashi
  • Publication number: 20160254786
    Abstract: A power supply circuit (10) includes: a linear amplifier (11) for generating a linear amplification signal based on an input signal; a first switching amplifier (12) for generating a first switching amplification signal of a first frequency band based on the linear amplification signal; a second switching amplifier (13) for generating a second switching amplification signal of a second frequency band based on the first switching amplification signal; and a power supply unit (14) for supplying a combined signal in which the linear amplification signal and the first and second switching amplification signals are combined to an external circuit as a power supply. It is therefore possible to improve the power efficiency.
    Type: Application
    Filed: May 9, 2014
    Publication date: September 1, 2016
    Applicant: NEC CORPORATION
    Inventor: Kiyohiko TAKAHASHI
  • Patent number: 9354653
    Abstract: A power supply circuit includes a first power amplifier that amplifies an input signal; a high pass filter that removes frequency components that are lower than a predetermined first cutoff frequency from an output signal of the first power amplifier; a current detector that detects a current value of the output signal of the first power amplifier; a composite signal generation circuit that combines the input signal and an output signal of the current detector; a second power amplifier that amplifies an output signal of the composite signal generation circuit; a low pass filter that removes frequency components that are higher than a predetermined second cutoff frequency from an output signal of the second power amplifier; and a signal output terminal that combines a current of an output signal of the high pass filter and a current of an output signal of the low pass filter and then outputs the resultant signal.
    Type: Grant
    Filed: April 11, 2012
    Date of Patent: May 31, 2016
    Assignee: NEC CORPORATION
    Inventor: Kiyohiko Takahashi
  • Patent number: 9065393
    Abstract: The present invention allows amplification with low distortion and high efficiency. A power amplifier of the present invention comprises signal conversion means which generates a digital signal and an analog signal from an input signal that is an amplification target based on a signal generation parameter, a switching amplifier which amplifies the digital signal, a linear amplifier which amplifies the analog signal, and DC level detection means which detect a DC level of at least one of the signal amplified by the linear amplifier and the amplified signal and output a detection result to the signal conversion means, wherein the signal conversion means adjust the signal generation parameter so that the DC level inputted by the DC level detection means is virtually equal to zero.
    Type: Grant
    Filed: September 26, 2011
    Date of Patent: June 23, 2015
    Assignee: NEC CORPORATION
    Inventor: Kiyohiko Takahashi
  • Patent number: 8975958
    Abstract: In a power supply circuit which uses a switching amplifier in combination with a linear amplifier, in order to be capable of correcting errors of operation of the switching amplifier and the linear amplifier, that is to say, in order to cause the switching amplifier and the linear amplifier to operate in coordination in a near-ideal state, the power supply circuit is provided with first amplification unit for delaying an input signal by a predetermined set time and amplifying the input signal, current detection unit for detecting a current value of an output signal of the first amplification unit, predicted signal generation unit for generating a pulse signal on a basis of an output signal of the current detection unit and the input signal, second amplification unit for amplifying the pulse signal and signal output unit for combining current of the output signal of the first amplification unit and current of the output signal of the second amplification unit to output the combined current, wherein the set tim
    Type: Grant
    Filed: November 30, 2011
    Date of Patent: March 10, 2015
    Assignee: NEC Corporation
    Inventor: Kiyohiko Takahashi
  • Publication number: 20140028279
    Abstract: A power supply circuit includes a first power amplifier that amplifies an input signal; a high pass filter that removes frequency components that are lower than a predetermined first cutoff frequency from an output signal of the first power amplifier; a current detector that detects a current value of the output signal of the first power amplifier; a composite signal generation circuit that combines the input signal and an output signal of the current detector; a second power amplifier that amplifies an output signal of the composite signal generation circuit; a low pass filter that removes frequency components that are higher than a predetermined second cutoff frequency from an output signal of the second power amplifier; and a signal output terminal that combines a current of an output signal of the high pass filter and a current of an output signal of the low pass filter and then outputs the resultant signal.
    Type: Application
    Filed: April 11, 2012
    Publication date: January 30, 2014
    Applicant: NEC CORPORATION
    Inventor: Kiyohiko Takahashi
  • Publication number: 20130241658
    Abstract: In a power supply circuit which uses a switching amplifier in combination with a linear amplifier, in order to be capable of correcting errors of operation of the switching amplifier and the linear amplifier, that is to say, in order to cause the switching amplifier and the linear amplifier to operate in coordination in a near-ideal state, the power supply circuit is provided with first amplification unit for delaying an input signal by a predetermined set time and amplifying the input signal, current detection unit for detecting a current value of an output signal of the first amplification unit, predicted signal generation unit for generating a pulse signal on a basis of an output signal of the current detection unit and the input signal, second amplification unit for amplifying the pulse signal and signal output unit for combining current of the output signal of the first amplification unit and current of the output signal of the second amplification unit to output the combined current, wherein the set tim
    Type: Application
    Filed: November 30, 2011
    Publication date: September 19, 2013
    Applicant: NEC CORPORATION
    Inventor: Kiyohiko Takahashi
  • Publication number: 20130194037
    Abstract: The present invention allows amplification with low distortion and high efficiency. A power amplifier of the present invention comprises signal conversion means which generates a digital signal and an analog signal from an input signal that is an amplification target based on a signal generation parameter, a switching amplifier which amplifies the digital signal, a linear amplifier which amplifies the analog signal, and DC level detection means which detect a DC level of at least one of the signal amplified by the linear amplifier and the amplified signal and output a detection result to the signal conversion means, wherein the signal conversion means adjust the signal generation parameter so that the DC level inputted by the DC level detection means is virtually equal to zero.
    Type: Application
    Filed: September 26, 2011
    Publication date: August 1, 2013
    Applicant: NEC CORPORATION
    Inventor: Kiyohiko Takahashi
  • Publication number: 20120260857
    Abstract: A heat treatment apparatus includes a reaction tube extending in a first direction; a substrate support unit which is placed in the reaction tube and is configured to be capable of supporting plural substrates along the first direction; plural gas supply pipes provided at a side surface of the reaction tube to be aligned in the first direction with intervals for supplying a gas into the reaction tube; a gas dispersing plate which is provided in the reaction tube between opening edges of the plural gas supply pipes and the substrate support unit placed in the reaction tube, the gas dispersing plate being provided with plural opening portions formed to correspond to the gas supply pipes, respectively; and a heater which is placed outside the reaction tube for heating the substrates.
    Type: Application
    Filed: April 17, 2012
    Publication date: October 18, 2012
    Applicant: Tokyo Electron Limited
    Inventors: Kiyohiko TAKAHASHI, Hirofumi Kaneko
  • Patent number: 8254496
    Abstract: A power amplifier (10) comprises: an A/D converter (11) for converting, to a time discrete signal, an envelope signal included in a high-frequency modulated signal and including only an amplitude modulated component of the high-frequency modulated signal; a switching amplifier (12) for amplifying the output signal of the A/D converter (11); a low-pass filter (13) for removing high frequency noise from the output signal of the switching amplifier (12); a plurality of high-frequency power amplifiers (15-1 to 15-n) for receiving the output signal of the low-pass filter (13) as a power supply and for amplifying a carrier signal included in the high-frequency modulated signal; and a power controller (14) for adjusting the average power of the output signal of the power amplifier (10) by controlling the total gains of the plurality of high-frequency power amplifiers (15-1 to 15-n).
    Type: Grant
    Filed: August 22, 2008
    Date of Patent: August 28, 2012
    Assignee: NEC Corporation
    Inventor: Kiyohiko Takahashi
  • Publication number: 20110254622
    Abstract: A radio frequency amplifier amplifies a modulation signal or its phase modulation signal and outputs the resultant signal. A linear amplifying section adds an output voltage to a power supply voltage supplied to the radio frequency amplifier and negatively feeds back the power supply voltage supplied to the radio frequency amplifier such that the power supply voltage matches the amplitude modulation component of the modulation signal with a predetermined ratio. A control signal generation section detects a direction in which an output current of the linear amplifying section flows and generates a pulse modulation signal according to the direction of the current. A switching amplifying section controls connection and disconnection of a DC current based on the pulse modulation signal as a control signal so as to perform switching amplification for an output signal of the linear amplifying section and supply the resultant signal as the power supply voltage to the radio frequency amplifier.
    Type: Application
    Filed: December 16, 2009
    Publication date: October 20, 2011
    Inventors: Kazuaki Kunihiro, Shingo Yamanouchi, Kiyohiko Takahashi
  • Patent number: 7965140
    Abstract: A power amplifier is provided with an AD converter pulse modulating an envelope signal extracted from a high frequency modulation signal; a switching amplifier amplifying an output signal from the AD converter; a low-pass filter removing high frequency noise from an output signal from the switching amplifier; a voltage control device controlling a power supply voltage of the switching amplifier; and a high frequency amplifier amplifying a phase-modulated signal having a constant envelope and having output from the low-pass filter as a power supply. The average power of the envelope signal to be inputted to the AD converter is permitted to be constant so that an input dynamic range of the AD converter can be most efficiently used. In addition the average power of the output signal from the power amplifier is adjusted by a power supply voltage to be supplied to the switching amplifier.
    Type: Grant
    Filed: December 28, 2007
    Date of Patent: June 21, 2011
    Assignee: NEC Corporation
    Inventor: Kiyohiko Takahashi
  • Publication number: 20100266066
    Abstract: A power amplifier (10) comprises: an A/D converter (11) for converting, to a time discrete signal, an envelope signal included in a high-frequency modulated signal and including only an amplitude modulated component of the high-frequency modulated signal; a switching amplifier (12) for amplifying the output signal of the A/D converter (11); a low-pass filter (13) for removing high frequency noise from the output signal of the switching amplifier (12); a plurality of high-frequency power amplifiers (15-1 to 15-n) for receiving the output signal of the low-pass filter (13) as a power supply and for amplifying a carrier signal included in the high-frequency modulated signal; and a power controller (14) for adjusting the average power of the output signal of the power amplifier (10) by controlling the total gains of the plurality of high-frequency power amplifiers (15-1 to 15-n).
    Type: Application
    Filed: August 22, 2008
    Publication date: October 21, 2010
    Applicant: NEC CORPORATION
    Inventor: Kiyohiko Takahashi
  • Patent number: 7762809
    Abstract: Disclosed is a heat treatment apparatus which includes a processing vessel having a furnace throat at its bottom and adapted to accommodate process objects therein to perform a heat treatment to the process objects under reduced pressure, the processing vessel having a vessel main body made of quartz, a metallic lid adapted to support thereon a holder for holding a plurality of process objects so as to load and unload the holder into and from the processing vessel and to close and open the furnace throat, and an annular sealing member disposed on the lid to seal a gap between the lid and the furnace throat. A contact-preventing member is disposed between the lid and the furnace throat to prevent contact of the lid with the furnace throat due to squashing of the sealing member that would otherwise occur when an internal pressure of the processing vessel is reduced.
    Type: Grant
    Filed: October 12, 2007
    Date of Patent: July 27, 2010
    Assignee: Tokyo Electron Limited
    Inventors: Kiichi Takahashi, Yuichiro Sase, Izumi Sato, Kiyohiko Takahashi
  • Patent number: 7696818
    Abstract: A pulse modulator generates a pulse-modulated signal by pulse-modulating and amplifying the amplitude component of an input signal. A low-pass filter filters the pulse-modulated signal from the pulse modulator, and generates an amplified amplitude signal which is obtained by amplifying the amplitude component. An error corrector generates a corrected amplitude signal by correcting an error of the amplified amplitude signal from the low-pass filter by using the amplitude component of the input signal. A mixing unit generates the output signal by mixing the corrected amplitude signal from the error corrector and the phase component of the input signal.
    Type: Grant
    Filed: November 28, 2007
    Date of Patent: April 13, 2010
    Assignee: NEC Corporation
    Inventors: Kazuaki Kunihiro, Kiyohiko Takahashi
  • Publication number: 20100019840
    Abstract: A power amplifier is provided with an AD converter pulse modulating an envelope signal extracted from a high frequency modulation signal; a switching amplifier amplifying an output signal from the AD converter; a low-pass filter removing high frequency noise from an output signal from the switching amplifier; a voltage control device controlling a power supply voltage of the switching amplifier; and a high frequency amplifier amplifying a phase-modulated signal having a constant envelope and having output from the low-pass filter as a power supply. The average power of the envelope signal to be inputted to the AD converter is permitted to be constant so that an input dynamic range of the AD converter can be most efficiently used. In addition the average power of the output signal from the power amplifier is adjusted by a power supply voltage to be supplied to the switching amplifier.
    Type: Application
    Filed: December 28, 2007
    Publication date: January 28, 2010
    Inventor: Kiyohiko Takahashi
  • Publication number: 20080258831
    Abstract: A pulse modulator generates a pulse-modulated signal by pulse-modulating and amplifying the amplitude component of an input signal. A low-pass filter filters the pulse-modulated signal from the pulse modulator, and generates an amplified amplitude signal which is obtained by amplifying the amplitude component. An error corrector generates a corrected amplitude signal by correcting an error of the amplified amplitude signal from the low-pass filter by using the amplitude component of the input signal. A mixing unit generates the output signal by mixing the corrected amplitude signal from the error corrector and the phase component of the input signal.
    Type: Application
    Filed: November 28, 2007
    Publication date: October 23, 2008
    Applicant: NEC CORPORATION
    Inventors: Kazuaki KUNIHIRO, Kiyohiko TAKAHASHI
  • Publication number: 20080090195
    Abstract: Disclosed is a heat treatment apparatus which includes a processing vessel having a furnace throat at its bottom and adapted to accommodate process objects therein to perform a heat treatment to the process objects under reduced pressure, the processing vessel having a vessel main body made of quartz, a metallic lid adapted to support thereon a holder for holding a plurality of process objects so as to load and unload the holder into and from the processing vessel and to close and open the furnace throat, and an annular sealing member disposed on the lid to seal a gap between the lid and the furnace throat. A contact-preventing member is disposed between the lid and the furnace throat to prevent contact of the lid with the furnace throat due to squashing of the sealing member that would otherwise occur when an internal pressure of the processing vessel is reduced.
    Type: Application
    Filed: October 12, 2007
    Publication date: April 17, 2008
    Inventors: Kiichi Takahashi, Yuichiro Sase, Izumi Sato, Kiyohiko Takahashi
  • Patent number: 4943206
    Abstract: A method of supplying cartons to a carton-packaging machine, comprising the steps of providing flattened cartons stacked in a line in a container package so that two cutouts on the cartons are lined to form two grooves on two parallel sides of the cartons; inserting two bar-shaped forks into the grooves respectively in the stacking direction of the cartons; pressing the cartons to be together along the inserting direction of the bar-shaped forks by pressers, which are adjustable for a different stacking amount of the cartons, so that the cartons are placed at the central portion of the bar-shaped forks; pulling out the cartons from the package with the bar-shaped forks; and supplying the cartons to the carton-packaging machine with the bar-shaped forks.
    Type: Grant
    Filed: June 12, 1989
    Date of Patent: July 24, 1990
    Assignee: Konica Corporation
    Inventors: Masao Watanabe, Shuri Mizoguchi, Satoshi Kawai, Kiyohiko Takahashi, Toyokiti Tanimura
  • Patent number: D611013
    Type: Grant
    Filed: September 26, 2008
    Date of Patent: March 2, 2010
    Assignee: Tokyo Electron Limited
    Inventor: Kiyohiko Takahashi