Patents by Inventor Nobuhiro Odaira
Nobuhiro Odaira 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: 20230384366Abstract: The present invention provides a stress testing circuit including a control circuit. In a test mode, the control circuit controls a supply voltage which is applied to a pre-charge circuit including transistors in a semiconductor memory device. The control circuit controls the supply voltage according to the voltage of an external power supply and the threshold voltage of the transistors included in the pre-charge circuit.Type: ApplicationFiled: May 12, 2023Publication date: November 30, 2023Applicant: Winbond Electronics Corp.Inventor: Nobuhiro ODAIRA
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Patent number: 11128274Abstract: A differential amplifier is provided. The differential amplifier includes: a differential input circuit, adjusting a second current and a third current flowing into the differential input circuit according to a first input voltage, a second input voltage, and a first current; a first current source circuit, generating the first current according to a first reference voltage; a current-mirror circuit, generating a fifth current according to a fourth current; a second current source circuit, generating a sixth current and a seventh current according to a second reference voltage; and an impedance circuit, coupled to the current-mirror circuit and a ground terminal, the differential amplifier having a low output voltage error.Type: GrantFiled: March 26, 2020Date of Patent: September 21, 2021Assignee: Winbond Electronics Corp.Inventor: Nobuhiro Odaira
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Publication number: 20200358411Abstract: A differential amplifier is provided. The differential amplifier includes: a differential input circuit, adjusting a second current and a third current flowing into the differential input circuit according to a first input voltage, a second input voltage, and a first current; a first current source circuit, generating the first current according to a first reference voltage; a current-mirror circuit, generating a fifth current according to a fourth current; a second current source circuit, generating a sixth current and a seventh current according to a second reference voltage; and an impedance circuit, coupled to the current-mirror circuit and a ground terminal, the differential amplifier having a low output voltage error.Type: ApplicationFiled: March 26, 2020Publication date: November 12, 2020Applicant: Winbond Electronics Corp.Inventor: Nobuhiro Odaira
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Patent number: 7489580Abstract: A refresh period generating circuit which generates a refresh period in refreshing a DRAM cell, comprising: an oscillation circuit which oscillates at a frequency with temperature dependence on ambient temperature; a dividing circuit which divides an oscillation output of the oscillation circuit; a temperature detector which detects the ambient temperature; and a selector which switches and selects among division outputs with respective frequencies from the dividing circuit based on an output of the temperature detector, and outputs a signal as a reference of the refresh period. The temperature dependence in the oscillation circuit includes a positive temperature coefficient in a predetermined temperature range, and does not include a positive temperature coefficient out of the predetermined temperature range. The selector switches the division outputs out of the predetermined temperature range.Type: GrantFiled: July 5, 2007Date of Patent: February 10, 2009Assignee: Elpida Memory, Inc.Inventors: Yutaka Ito, Nobuhiro Odaira
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Publication number: 20070253271Abstract: A refresh period generating circuit which generates a refresh period in refreshing a DRAM cell, comprising: an oscillation circuit which oscillates at a frequency with temperature dependence on ambient temperature; a dividing circuit which divides an oscillation output of the oscillation circuit; a temperature detector which detects the ambient temperature; and a selector which switches and selects among division outputs with respective frequencies from the dividing circuit based on an output of the temperature detector, and outputs a signal as a reference of the refresh period. The temperature dependence in the oscillation circuit includes a positive temperature coefficient in a predetermined temperature range, and does not include a positive temperature coefficient out of the predetermined temperature range. The selector switches the division outputs out of the predetermined temperature range.Type: ApplicationFiled: July 5, 2007Publication date: November 1, 2007Applicant: ELPIDA MEMORY, INC.Inventors: Yutaka Ito, Nobuhiro Odaira
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Patent number: 7248526Abstract: A refresh period generating circuit which generates a refresh period in refreshing a DRAM cell, comprising: an oscillation circuit which oscillates at a frequency with temperature dependence on ambient temperature; a dividing circuit which divides an oscillation output of the oscillation circuit; a temperature detector which detects the ambient temperature; and a selector which switches and selects among division outputs with respective frequencies from the dividing circuit based on an output of the temperature detector, and outputs a signal as a reference of the refresh period. The temperature dependence in the oscillation circuit includes a positive temperature coefficient in a predetermined temperature range, and does not include a positive temperature coefficient out of the predetermined temperature range. The selector switches the division outputs out of the predetermined temperature range.Type: GrantFiled: July 14, 2005Date of Patent: July 24, 2007Assignee: Elpida Memory, Inc.Inventors: Yutaka Ito, Nobuhiro Odaira
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Publication number: 20060023545Abstract: A refresh period generating circuit which generates a refresh period in refreshing a DRAM cell, comprising: an oscillation circuit which oscillates at a frequency with temperature dependence on ambient temperature; a dividing circuit which divides an oscillation output of the oscillation circuit; a temperature detector which detects the ambient temperature; and a selector which switches and selects among division outputs with respective frequencies from the dividing circuit based on an output of the temperature detector, and outputs a signal as a reference of the refresh period. The temperature dependence in the oscillation circuit includes a positive temperature coefficient in a predetermined temperature range, and does not include a positive temperature coefficient out of the predetermined temperature range. The selector switches the division outputs out of the predetermined temperature range.Type: ApplicationFiled: July 14, 2005Publication date: February 2, 2006Inventors: Yutaka Ito, Nobuhiro Odaira