Patents by Inventor Mario Sako
Mario Sako 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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Publication number: 20240420765Abstract: A semiconductor storage device includes a first memory cell electrically connected to a first bit line and a first word line, a second memory cell electrically connected to a second bit line and the first word line, and a first circuit configured to supply voltages to the first word line. During a reading operation to read a page of memory cells including the first memory cell and the second memory cell, the first circuit supplies a first voltage to the first word line while the first memory cell is selected as a read target during a first time period, and supplies a second voltage greater than the first voltage to the first word line while the second memory cell is selected as a read target during a second time period that is different from the first time period, and directly thereafter, supplies the first voltage to the first word line.Type: ApplicationFiled: August 28, 2024Publication date: December 19, 2024Inventors: Mai SHIMIZU, Koji KATO, Yoshihiko KAMATA, Mario SAKO
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Patent number: 12106808Abstract: A semiconductor storage device includes a first memory cell electrically connected to a first bit line and a first word line, a second memory cell electrically connected to a second bit line and the first word line, and a first circuit configured to supply voltages to the first word line. During a reading operation to read a page of memory cells including the first memory cell and the second memory cell, the first circuit supplies a first voltage to the first word line while the first memory cell is selected as a read target during a first time period, and supplies a second voltage greater than the first voltage to the first word line while the second memory cell is selected as a read target during a second time period that is different from the first time period, and directly thereafter, supplies the first voltage to the first word line.Type: GrantFiled: October 12, 2023Date of Patent: October 1, 2024Assignee: Kioxia CorporationInventors: Mai Shimizu, Koji Kato, Yoshihiko Kamata, Mario Sako
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Patent number: 11948646Abstract: A semiconductor memory includes memory cells, a word line and bit lines of the memory cells, sense amplifiers connected to the bit lines, respectively, and a controller. Each sense amplifier includes first, second, and third transistors. The third transistor has one end connected to each of the first and second transistors, and the other end connected to a corresponding bit line. During a read operation, at a first time of a first period during which the controller applies a first read voltage to the word line, the controller applies a first voltage higher than ground voltage to the first transistor, and a second voltage to the second transistor. Also, at the first time, a first sense amplifier applies a voltage to a first bit line through its first and third transistors, and a second sense amplifier applies a voltage to a second bit line through tis second and third transistors.Type: GrantFiled: April 24, 2023Date of Patent: April 2, 2024Assignee: Kioxia CorporationInventors: Kosuke Yanagidaira, Mario Sako
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Publication number: 20240087656Abstract: A semiconductor memory device includes a first memory cell transistor, a first bit line electrically coupled to the first memory cell transistor, a first sense amplifier, and a first latch circuit. The first sense amplifier includes a first node coupled to the first bit line, a first transistor including one end electrically coupled to the first latch circuit, a second node coupled to a gate of the first transistor, and a second transistor coupled between the first and second nodes. The second transistor is in an ON state during an operation of transferring a charge from the first bit line to the first and second nodes in accordance with data of the first memory cell transistor. The second transistor is in an OFF state during an operation of transferring data of the second node to the first latch circuit.Type: ApplicationFiled: June 12, 2023Publication date: March 14, 2024Applicant: Kioxia CorporationInventors: Katsuaki ISOBE, Takeshi HIOKA, Mario SAKO
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Publication number: 20240038305Abstract: A semiconductor storage device includes a first memory cell electrically connected to a first bit line and a first word line, a second memory cell electrically connected to a second bit line and the first word line, and a first circuit configured to supply voltages to the first word line. During a reading operation to read a page of memory cells including the first memory cell and the second memory cell, the first circuit supplies a first voltage to the first word line while the first memory cell is selected as a read target during a first time period, and supplies a second voltage greater than the first voltage to the first word line while the second memory cell is selected as a read target during a second time period that is different from the first time period, and directly thereafter, supplies the first voltage to the first word line.Type: ApplicationFiled: October 12, 2023Publication date: February 1, 2024Inventors: Mai SHIMIZU, Koji KATO, Yoshihiko KAMATA, Mario SAKO
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Patent number: 11862248Abstract: A semiconductor storage device includes a first memory cell electrically connected to a first bit line and a first word line, a second memory cell electrically connected to a second bit line and the first word line, and a first circuit configured to supply voltages to the first word line. During a reading operation to read a page of memory cells including the first memory cell and the second memory cell, the first circuit supplies a first voltage to the first word line while the first memory cell is selected as a read target during a first time period, and supplies a second voltage greater than the first voltage to the first word line while the second memory cell is selected as a read target during a second time period that is different from the first time period, and directly thereafter, supplies the first voltage to the first word line.Type: GrantFiled: January 30, 2023Date of Patent: January 2, 2024Assignee: Kioxia CorporationInventors: Mai Shimizu, Koji Kato, Yoshihiko Kamata, Mario Sako
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Publication number: 20230260579Abstract: A semiconductor memory includes memory cells, a word line and bit lines of the memory cells, sense amplifiers connected to the bit lines, respectively, and a controller. Each sense amplifier includes first, second, and third transistors. The third transistor has one end connected to each of the first and second transistors, and the other end connected to a corresponding bit line. During a read operation, at a first time of a first period during which the controller applies a first read voltage to the word line, the controller applies a first voltage higher than ground voltage to the first transistor, and a second voltage to the second transistor. Also, at the first time, a first sense amplifier applies a voltage to a first bit line through its first and third transistors, and a second sense amplifier applies a voltage to a second bit line through tis second and third transistors.Type: ApplicationFiled: April 24, 2023Publication date: August 17, 2023Inventors: Kosuke YANAGIDAIRA, Mario SAKO
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Publication number: 20230178152Abstract: A semiconductor storage device includes a first memory cell electrically connected to a first bit line and a first word line, a second memory cell electrically connected to a second bit line and the first word line, and a first circuit configured to supply voltages to the first word line. During a reading operation to read a page of memory cells including the first memory cell and the second memory cell, the first circuit supplies a first voltage to the first word line while the first memory cell is selected as a read target during a first time period, and supplies a second voltage greater than the first voltage to the first word line while the second memory cell is selected as a read target during a second time period that is different from the first time period, and directly thereafter, supplies the first voltage to the first word line.Type: ApplicationFiled: January 30, 2023Publication date: June 8, 2023Inventors: Mai SHIMIZU, Koji KATO, Yoshihiko KAMATA, Mario SAKO
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Patent number: 11670383Abstract: A semiconductor memory includes memory cells, a word line and bit lines of the memory cells, sense amplifiers connected to the bit lines, respectively, and a controller. Each sense amplifier includes first, second, and third transistors. The third transistor has one end connected to each of the first and second transistors, and the other end connected to a corresponding bit line. During a read operation, at a first time of a first period during which the controller applies a first read voltage to the word line, the controller applies a first voltage higher than ground voltage to the first transistor, and a second voltage to the second transistor. Also, at the first time, a first sense amplifier applies a voltage to a first bit line through its first and third transistors, and a second sense amplifier applies a voltage to a second bit line through the second and third transistors.Type: GrantFiled: January 13, 2022Date of Patent: June 6, 2023Assignee: KIOXIA CORPORATIONInventors: Kosuke Yanagidaira, Mario Sako
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Patent number: 11600328Abstract: A semiconductor storage device includes a first memory cell electrically connected to a first bit line and a first word line, a second memory cell electrically connected to a second bit line and the first word line, and a first circuit configured to supply voltages to the first word line. During a reading operation to read a page of memory cells including the first memory cell and the second memory cell, the first circuit supplies a first voltage to the first word line while the first memory cell is selected as a read target during a first time period, and supplies a second voltage greater than the first voltage to the first word line while the second memory cell is selected as a read target during a second time period that is different from the first time period, and directly thereafter, supplies the first voltage to the first word line.Type: GrantFiled: February 2, 2022Date of Patent: March 7, 2023Assignee: Kioxia CorporationInventors: Mai Shimizu, Koji Kato, Yoshihiko Kamata, Mario Sako
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Patent number: 11568939Abstract: A semiconductor storage device includes a bit line, a memory cell transistor electrically connected to the bit line, and a sense amplifier that reads data from the memory cell transistor via the bit line. During an operation of determining first data and second data, while continuously applying a first voltage to a gate of the memory cell transistor, the sense amplifier first determines the first data based upon a second voltage, and then determines the second data based upon a third voltage lower than the second voltage.Type: GrantFiled: February 24, 2021Date of Patent: January 31, 2023Assignee: Kioxia CorporationInventor: Mario Sako
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Patent number: 11501825Abstract: According to one embodiment, a semiconductor memory device includes a memory cell, a bit line, and a sense amplifier. The sense amplifier includes: a first node configured to be electrically coupled to the bit line; a first transistor in which a gate is coupled to the first node, and which is configured to be coupled to a second node; a second transistor configured to couple the second node and a third node; and a third transistor in which a gate is coupled to the third node, and which is configured to be coupled to the first node. The sense amplifier applies a second voltage obtained by amplifying a first voltage of the first node to the third node, and applies a third voltage obtained by amplifying the second voltage to the first node.Type: GrantFiled: June 16, 2021Date of Patent: November 15, 2022Inventor: Mario Sako
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Patent number: 11417401Abstract: A semiconductor memory device includes a bit line, a first memory cell electrically connected to the bit line, and a sense amplifier connected to the bit lin. The sense amplifier includes a first capacitor element having an electrode that is connected to a first node electrically connectable to the bit line, a first transistor having a gate connected to the first node and a first end connectable to a second node, a second transistor having a first end connected to the second node and a second end connected to a third node, a second capacitor element having an electrode connected to the third node, and a latch circuit connected to the second node.Type: GrantFiled: August 31, 2020Date of Patent: August 16, 2022Assignee: KIOXIA CORPORATIONInventors: Mario Sako, Hiromitsu Komai, Masahiro Yoshihara
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Publication number: 20220246197Abstract: According to one embodiment, a semiconductor memory device includes a memory cell, a bit line, and a sense amplifier. The sense amplifier includes: a first node configured to be electrically coupled to the bit line; a first transistor in which a gate is coupled to the first node, and which is configured to be coupled to a second node; a second transistor configured to couple the second node and a third node; and a third transistor in which a gate is coupled to the third node, and which is configured to be coupled to the first node. The sense amplifier applies a second voltage obtained by amplifying a first voltage of the first node to the third node, and applies a third voltage obtained by amplifying the second voltage to the first node.Type: ApplicationFiled: June 16, 2021Publication date: August 4, 2022Applicant: Kioxia CorporationInventor: Mario SAKO
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Publication number: 20220157380Abstract: A semiconductor storage device includes a first memory cell electrically connected to a first bit line and a first word line, a second memory cell electrically connected to a second bit line and the first word line, and a first circuit configured to supply voltages to the first word line. During a reading operation to read a page of memory cells including the first memory cell and the second memory cell, the first circuit supplies a first voltage to the first word line while the first memory cell is selected as a read target during a first time period, and supplies a second voltage greater than the first voltage to the first word line while the second memory cell is selected as a read target during a second time period that is different from the first time period, and directly thereafter, supplies the first voltage to the first word line.Type: ApplicationFiled: February 2, 2022Publication date: May 19, 2022Inventors: Mai Shimizu, Koji Kato, Yoshihiko Kamata, Mario Sako
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Publication number: 20220139467Abstract: A semiconductor memory includes memory cells, a word line and bit lines of the memory cells, sense amplifiers connected to the bit lines, respectively, and a controller. Each sense amplifier includes first, second, and third transistors. The third transistor has one end connected to each of the first and second transistors, and the other end connected to a corresponding bit line. During a read operation, at a first time of a first period during which the controller applies a first read voltage to the word line, the controller applies a first voltage higher than ground voltage to the first transistor, and a second voltage to the second transistor. Also, at the first time, a first sense amplifier applies a voltage to a first bit line through its first and third transistors, and a second sense amplifier applies a voltage to a second bit line through the second and third transistors.Type: ApplicationFiled: January 13, 2022Publication date: May 5, 2022Inventors: Kosuke YANAGIDAIRA, Mario SAKO
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Patent number: 11276466Abstract: A semiconductor storage device includes a first memory cell electrically connected to a first bit line and a first word line, a second memory cell electrically connected to a second bit line and the first word line, and a first circuit configured to supply voltages to the first word line. During a reading operation to read a page of memory cells including the first memory cell and the second memory cell, the first circuit supplies a first voltage to the first word line while the first memory cell is selected as a read target during a first time period, and supplies a second voltage greater than the first voltage to the first word line while the second memory cell is selected as a read target during a second time period that is different from the first time period, and directly thereafter, supplies the first voltage to the first word line.Type: GrantFiled: November 19, 2020Date of Patent: March 15, 2022Assignee: KIOXIA CORPORATIONInventors: Mai Shimizu, Koji Kato, Yoshihiko Kamata, Mario Sako
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Patent number: 11227662Abstract: A semiconductor memory includes memory cells, a word line and bit lines of the memory cells, sense amplifiers connected to the bit lines, respectively, and a controller. Each sense amplifier includes first, second, and third transistors. The third transistor has one end connected to each of the first and second transistors, and the other end connected to a corresponding bit line. During a read operation, at a first time of a first period during which the controller applies a first read voltage to the word line, the controller applies a first voltage higher than ground voltage to the first transistor, and a second voltage to the second transistor. Also, at the first time, a first sense amplifier applies a voltage to a first bit line through its first and third transistors, and a second sense amplifier applies a voltage to a second bit line through its second and third transistors.Type: GrantFiled: November 24, 2020Date of Patent: January 18, 2022Assignee: TOSHIBA MEMORY CORPORATIONInventors: Kosuke Yanagidaira, Mario Sako
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Publication number: 20210312992Abstract: A semiconductor storage device includes a bit line, a memory cell transistor electrically connected to the bit line, and a sense amplifier that reads data from the memory cell transistor via the bit line. During an operation of determining first data and second data, while continuously applying a first voltage to a gate of the memory cell transistor, the sense amplifier first determines the first data based upon a second voltage, and then determines the second data based upon a third voltage lower than the second voltage.Type: ApplicationFiled: February 24, 2021Publication date: October 7, 2021Inventor: Mario SAKO
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Patent number: 11127470Abstract: According to one embodiment, a semiconductor memory device includes: a first bit line; a first memory cell electrically coupled to the first bit line; and a first sense amplifier configured to sense and store data read out to the first bit line. The first sense amplifier includes a first latch circuit and a second latch circuit. In a program operation, each of the first and second latch circuits stores any one bit of program data. In a first verify operation, data is exchanged between the first latch circuit and the second latch circuit when performing the first verify operation for a first data.Type: GrantFiled: June 15, 2020Date of Patent: September 21, 2021Assignee: KIOXIA CORPORATIONInventor: Mario Sako