Patents by Inventor Kouichiro Uekusa
Kouichiro Uekusa 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: 8094053Abstract: Provided is a signal generating apparatus comprising a DA converter that outputs an output signal corresponding to input data supplied thereto; a sample/hold unit that is provided between the DA converter and an output end of the signal generating apparatus, and that samples an output voltage of the DA converter and holds the sampled output voltage; a comparing section that compares (i) a level of a signal output from an analog circuit that propagates the output signal to output a signal corresponding to the input data to (ii) a level of the signal output by the DA converter; and a control section that, during a holding period, (iii) provides the DA converter with comparison data instead of the input data to cause the DA converter to output a comparison voltage corresponding to the comparison data, (iv) causes the comparing section to compare a voltage of the signal output by the analog circuit to the comparison voltage, and (v) adjusts the output voltage of the DA converter based on a comparison result of thType: GrantFiled: December 10, 2009Date of Patent: January 10, 2012Assignee: Advantest CorporationInventors: Yasuhide Kuramochi, Kouichiro Uekusa, Masayuki Kawabata
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Patent number: 8068047Abstract: Provided is an AD conversion apparatus including: a differential amplifier that generates a differential input voltage according to an analog input signal; a differential DA converter of a charge redistribution type, which outputs a differential output voltage resulting from subtracting the differential input voltage from a differential comparison voltage that is in accordance with comparison data; a comparator that compares a positive output voltage and a negative output voltage in the differential output voltage; a control section that identifies the comparison data at which the differential output voltage becomes substantially 0 based on a comparison result of the comparator, and outputs the identified comparison data as output data; and a setting section that sets at least one of a common potential of the differential amplifier and a common potential of the differential DA converter, according to a targeted value of a common potential of the comparatorType: GrantFiled: January 14, 2010Date of Patent: November 29, 2011Assignee: Advantest CorporationInventors: Yasuhide Kuramochi, Masayuki Kawabata, Kouichiro Uekusa
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Patent number: 7982520Abstract: Provided is a signal generating apparatus that outputs from an output end thereof an output voltage corresponding to input data supplied thereto, comprising: a DA converter that outputs a voltage corresponding to data supplied thereto; a capacitor section that is provided between the output end and a standard potential; a transmission switch that provides a connection or a disconnect between a voltage generating end of the DA converter and the output end; and a control section that causes the DA converter to charge the capacitor section with a voltage corresponding to the input data by repeatedly connecting and disconnecting the transmission switch, thereby causing the voltage of the capacitor section to gradually approach the output voltage corresponding to the input data.Type: GrantFiled: December 18, 2009Date of Patent: July 19, 2011Assignee: Advantest CorporationInventors: Yasuhide Kuramochi, Masayuki Kawabata, Kouichiro Uekusa
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Publication number: 20110169674Abstract: Provided is an AD conversion apparatus including: a differential amplifier that generates a differential input voltage according to an analog input signal; a differential DA converter of a charge redistribution type, which outputs a differential output voltage resulting from subtracting the differential input voltage from a differential comparison voltage that is in accordance with comparison data; a comparator that compares a positive output voltage and a negative output voltage in the differential output voltage; a control section that identifies the comparison data at which the differential output voltage becomes substantially 0 based on a comparison result of the comparator, and outputs the identified comparison data as output data; and a setting section that sets at least one of a common potential of the differential amplifier and a common potential of the differential DA converter, according to a targeted value of a common potential of the comparatorType: ApplicationFiled: January 14, 2010Publication date: July 14, 2011Applicant: ADVANTEST CORPORATIONInventors: Yasuhide KURAMOCHI, Masayuki KAWABATA, Kouichiro UEKUSA
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Publication number: 20110148499Abstract: Provided is a signal generating apparatus that outputs from an output end thereof an output voltage corresponding to input data supplied thereto, comprising: a DA converter that outputs a voltage corresponding to data supplied thereto; a capacitor section that is provided between the output end and a standard potential; a transmission switch that provides a connection or a disconnect between a voltage generating end of the DA converter and the output end; and a control section that causes the DA converter to charge the capacitor section with a voltage corresponding to the input data by repeatedly connecting and disconnecting the transmission switch, thereby causing the voltage of the capacitor section to gradually approach the output voltage corresponding to the input data.Type: ApplicationFiled: December 18, 2009Publication date: June 23, 2011Applicant: ADVANTEST CORPORATIONInventors: Yasuhide KURAMOCHI, Masayuki KAWABATA, Kouichiro UEKUSA
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Publication number: 20110140938Abstract: Provided is a signal generating apparatus comprising a DA converter that outputs an output signal corresponding to input data supplied thereto; a sample/hold unit that is provided between the DA converter and an output end of the signal generating apparatus, and that samples an output voltage of the DA converter and holds the sampled output voltage; a comparing section that compares (i) a level of a signal output from an analog circuit that propagates the output signal to output a signal corresponding to the input data to (ii) a level of the signal output by the DA converter; and a control section that, during a holding period, (iii) provides the DA converter with comparison data instead of the input data to cause the DA converter to output a comparison voltage corresponding to the comparison data, (iv) causes the comparing section to compare a voltage of the signal output by the analog circuit to the comparison voltage, and (v) adjusts the output voltage of the DA converter based on a comparison result of thType: ApplicationFiled: December 10, 2009Publication date: June 16, 2011Applicant: ADVANTEST CORPORATIONInventors: Yasuhide KURAMOCHI, Kouichiro UEKUSA, Masayuki KAWABATA