Patents by Inventor Atsushi Matamura
Atsushi Matamura 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: 11916707Abstract: Systems and methods are provided for architectures for an analog feedback class D modulator that increase the power efficiency of the class D modulator. In particular, systems and methods are provided for an analog feedback class D modulator having a digital feed-forward loop. The digital feed-forward loop allows for removal of signal content from an input to an analog-to-digital converter, such that the ADC processes just noise and/or error. Using the techniques discussed herein, the loop filter is low power as it processes error content but not signal content.Type: GrantFiled: March 23, 2022Date of Patent: February 27, 2024Assignee: Analog Devices International Unlimited CompanyInventors: Abhishek Bandyopadhyay, Atsushi Matamura
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Patent number: 11411543Abstract: Systems and methods are provided for circuit configurations that maintain audio playback performance while reducing power consumption. In particular, a gain for a current analog-to-digital converter in an audio playback path is adjusted based on an amplitude of the input signal. Additionally, systems and methods are provided for transitioning between a modes of operation for large signals and mode of operation for small signals.Type: GrantFiled: September 24, 2020Date of Patent: August 9, 2022Assignee: ANALOG DEVICES INTERNATIONAL UNLIMITED COMPANYInventors: Atsushi Matamura, Abhishek Bandyopadhyay
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Publication number: 20220216839Abstract: Differential switching output stage for audio, power and digital data transmission can cause a common mode error due to asymmetric transition between positive and negative outputs. Systems and methods are provided for common mode error correction. In particular, summing nodes, novel error amps an edge switching can be used for common-mode feedback (CMFB) in differential signaling and other applications.Type: ApplicationFiled: March 23, 2022Publication date: July 7, 2022Applicant: Analog Devices International Unlimited CompanyInventors: Naoaki NISHIMURA, Atsushi MATAMURA, Abhishek BANDYOPADHYAY, Mariana Tosheva MARKOVA
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Publication number: 20220217026Abstract: Systems and methods are provided for architectures for an analog feedback class D modulator that increase the power efficiency of the class D modulator. In particular, systems and methods are provided for an analog feedback class D modulator having a digital feed-forward loop. The digital feed-forward loop allows for removal of signal content from an input to an analog-to-digital converter, such that the ADC processes just noise and/or error. Using the techniques discussed herein, the loop filter is low power as it processes error content but not signal content.Type: ApplicationFiled: March 23, 2022Publication date: July 7, 2022Applicant: Analog Devices International Unlimited CompanyInventors: Abhishek BANDYOPADHYAY, Atsushi MATAMURA
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Publication number: 20210091739Abstract: Systems and methods are provided for circuit configurations that maintain audio playback performance while reducing power consumption. In particular, a gain for a current analog-to-digital converter in an audio playback path is adjusted based on an amplitude of the input signal. Additionally, systems and methods are provided for transitioning between a modes of operation for large signals and mode of operation for small signals.Type: ApplicationFiled: September 24, 2020Publication date: March 25, 2021Applicant: Analog Devices International Unlimited CompanyInventors: Atsushi MATAMURA, Abhishek BANDYOPADHYAY
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Patent number: 8345394Abstract: An ESD protection circuit for a switching power converter which includes a high-side switching element connected between a supply voltage and the switching node, and a low-side switching element connected between the switching node and a common node. A current conduction path couples an ESD event that occurs on the switching node to an ESD sense node, and an ESD sensing circuit coupled to the sense node generates a trigger signal when an ESD event is sensed. A first logic gate keeps the high-side switching element off when the trigger signal indicates the sensing of an ESD event, and a second logic gate causes the low-side switching element to turn on when an ESD event is sensed such that the low-side switching element provides a conductive discharge path between the switching node and common node.Type: GrantFiled: October 5, 2009Date of Patent: January 1, 2013Assignee: Analog Devices, Inc.Inventors: James W. Zhao, Reed W. Adams, Kenji Tomiyoshi, Bin Shao, Atsushi Matamura, Yogesh Sharma, Todd Thomas
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Publication number: 20110080678Abstract: An ESD protection circuit for a switching power converter which includes a high-side switching element connected between a supply voltage and the switching node, and a low-side switching element connected between the switching node and a common node. A current conduction path couples an ESD event that occurs on the switching node to an ESD sense node, and an ESD sensing circuit coupled to the sense node generates a trigger signal when an ESD event is sensed. A first logic gate keeps the high-side switching element off when the trigger signal indicates the sensing of an ESD event, and a second logic gate causes the low-side switching element to turn on when an ESD event is sensed such that the low-side switching element provides a conductive discharge path between the switching node and common node.Type: ApplicationFiled: October 5, 2009Publication date: April 7, 2011Inventors: JAMES W. ZHAO, REED W. ADAMS, KENJI TOMIYOSHI, BIN SHAO, ATSUSHI MATAMURA, YOGESH SHARMA, TODD THOMAS
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Publication number: 20100253396Abstract: The present invention relates to an H-bridge controller and method for controlling a common-mode voltage and/or current of an H-bridge circuit. The H-bridge controller comprises a section for receiving a signal indicating at least one of a common-mode voltage and common-mode current of the H-bridge circuit, and a section for generating control signals which determine switching of the H-bridge circuit so as to control at least one of the common-mode voltage and common-mode current of the H-bridge circuit.Type: ApplicationFiled: June 17, 2010Publication date: October 7, 2010Applicant: ANALOG DEVICES, INC.Inventor: Atsushi Matamura
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Patent number: 7772924Abstract: An H-bridge controller and a method for controlling a common-mode voltage and/or current of an H-bridge circuit are disclosed. In one embodiment, an H-bridge controller includes a section for receiving a signal indicating at least one of a common-mode voltage or common-mode current of the H-bridge circuit, and a section for generating control signals which determine switching of the H-bridge circuit so as to control at least one of the common-mode voltage or common-mode current of the H-bridge circuit. In another embodiment, a method for controlling a common-mode voltage and/or current of an H-bridge circuit includes receiving a signal indicating at least one of a common-mode voltage or common-mode current of the H-bridge circuit; and generating control signals which determine switching of the H-bridge circuit so as to control at least one of the common-mode voltage or common-mode current of the H-bridge circuit.Type: GrantFiled: November 15, 2006Date of Patent: August 10, 2010Assignee: Analog Devices, Inc.Inventor: Atsushi Matamura
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Publication number: 20080111619Abstract: The present invention relates to an H-bridge controller and method for controlling a common-mode voltage and/or current of an H-bridge circuit. The H-bridge controller comprises a section for receiving a signal indicating at least one of a common-mode voltage and common-mode current of the H-bridge circuit, and a section for generating control signals which determine switching of the H-bridge circuit so as to control at least one of the common-mode voltage and common-mode current of the H-bridge circuit.Type: ApplicationFiled: November 15, 2006Publication date: May 15, 2008Applicant: Analog Devices, Inc.Inventor: Atsushi Matamura
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Patent number: 7205920Abstract: A sigma-delta digital-to-analog converter comprises a current digital-to-analog converter (IDAC) stage which generates a current depending on an input digital signal. An output current-to-voltage converter converts the generated signal to a voltage on a continuous-time basis. The amplifier used in the output current-to-voltage converter is chopper-stabilized. The converter can be single bit or multi-bit. The IDAC stage can be implemented with a pair of branches, a first branch comprising a first biasing current source and a second branch comprising a second biasing current source. The biasing current sources can be chopper-stabilized by connecting the bias current sources to the output current-to-voltage converter by a set of switches. The switches connect the biasing current sources to the output current-to-voltage converter in a first configuration and a second, reversed, configuration. This modulates flicker noise contributed by the bias current sources to the chopping frequency.Type: GrantFiled: September 16, 2005Date of Patent: April 17, 2007Assignee: Analog Devices, Inc.Inventors: Paul John Morrow, Maria del Mar Chamarro Marti, Colin G. Lyden, Mike Dominic Keane, Robert W. Adams, Richard Thomas O'Brien, Paschal Thomas Minogue, Hans Johan Olaf Mansson, Atsushi Matamura, Andrew Abo
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Publication number: 20060139193Abstract: A sigma-delta digital-to-analog converter comprises a current digital-to-analog converter (IDAC) stage which generates a current depending on an input digital signal. An output current-to-voltage converter converts the generated signal to a voltage on a continuous-time basis. The amplifier used in the output current-to-voltage converter is chopper-stabilized. The converter can be single bit or multi-bit. The IDAC stage can be implemented with a pair of branches, a first branch comprising a first biasing current source and a second branch comprising a second biasing current source. The biasing current sources can be chopper-stabilized by connecting the bias current sources to the output current-to-voltage converter by a set of switches. The switches connect the biasing current sources to the output current-to-voltage converter in a first configuration and a second, reversed, configuration. This modulates flicker noise contributed by the bias current sources to the chopping frequency.Type: ApplicationFiled: September 16, 2005Publication date: June 29, 2006Inventors: Paul Morrow, Maria Chamarro Marti, Colin Lyden, Mike Keane, Robert Adams, Richard O'Brien, Paschal Minogue, Hans Mansson, Atsushi Matamura, Andrew Abo