Patents by Inventor You-Yuh Shyr
You-Yuh Shyr 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: 7904096Abstract: A Global Positioning System (GPS) system includes multiple GPS application servers. The multiple GPS application servers provide GPS assistant information for locating a mobile terminal. The mobile terminal receives GPS information from multiple GPS satellites. The GPS assistant information is determined based on a GPS position and a geographic position of a GPS application server of the multiple GPS application servers. The GPS application server is nearest of the multiple GPS application servers to the mobile terminal, and the geographic position of the GPS application server is known.Type: GrantFiled: August 18, 2006Date of Patent: March 8, 2011Assignee: O2Micro International LimitedInventors: You-Yuh Shyr, Mingqiang Cheng, Bo Yu
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Patent number: 7592777Abstract: A current mode charger controller for controlling a DC to DC converter. The current mode charger may include a first error amplifier having an output coupled to a common node. The first error amplifier may be configured to compare a first signal representative of a charging current provided to a rechargeable battery with a maximum charging current and provide a current control signal in response to the comparison. The current mode charger controller may further include an internal compensation network coupled to the common node, and a comparator configured to compare an inductor current signal representative of an inductor current through an inductor of the DC to DC converter with a compensation signal. The need for any external compensation for the current mode charger controller may be eliminated.Type: GrantFiled: November 18, 2005Date of Patent: September 22, 2009Assignee: O2Micro International LimitedInventors: Chun Lu, You-Yuh Shyr, Alexandru Hartular, Constantin Bucur
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Patent number: 7508176Abstract: A controller for a DC to DC converter. The controller may comprise linear mode circuitry and switch mode control circuitry. The linear mode control circuitry may be capable of providing a first control signal to a controlled device of the DC to DC converter. The controlled device may operate as a variable resistor in response to the first control signal to control an output voltage of the DC to DC converter. The switch mode control circuitry may be capable of providing a second control signal to the controlled device of the DC to DC converter. The controlled device may turn ON and OFF in response to the second control signal to control the output voltage of the DC to DC converter. One of the linear mode control circuitry and the switch mode control circuitry may be enabled. The controller may also include protection circuitry.Type: GrantFiled: October 13, 2005Date of Patent: March 24, 2009Assignee: O2Micro International LimitedInventors: Alexandru Hartular, Chun Lu, You-Yuh Shyr, Constantin Bucur, Vlad Mihail Popescu-Stanesti, Jiwei Chen, Oleg Kobildjanov
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Publication number: 20090033373Abstract: A programmable after-package, on-chip reference voltage trim circuit for an integrated circuit having a plurality of programmable trim cells generating a programmed sequence. A converter is provided to convert the bit sequence into a trim current. The trim current is added to an initial value of a reference voltage to be trimmed, as generated by the integrated circuit. Once the correct value of the trim current is determined, isolation circuitry is programmed to isolate the trim circuitry from the remainder of the IC, thereby freeing the logic and package pins associated with the IC for use by users of the IC. The preferred trim circuitry includes fuses which are blown in accordance with a bit value supplied to the trim cell to permanently fix a trim current value, once a best fit value is determined.Type: ApplicationFiled: October 10, 2008Publication date: February 5, 2009Applicant: O2Micro International LimitedInventors: You-Yuh Shyr, Sorin Laurentiu Negru
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Patent number: 7436222Abstract: A programmable after-package, on-chip reference voltage trim circuit for an integrated circuit having a plurality of programmable trim cells generating a programmed sequence. A converter is provided to convert the bit sequence into a trim current. The trim current is added to an initial value of a reference voltage to be trimmed, as generated by the integrated circuit. Once the correct value of the trim current is determined, isolation circuitry is programmed to isolate the trim circuitry from the remainder of the IC, thereby freeing the logic and package pins associated with the IC for use by users of the IC. The preferred trim circuitry includes fuses which are blown in accordance with a bit value supplied to the trim cell to permanently fix a trim current value, once a best fit value is determined.Type: GrantFiled: January 15, 2008Date of Patent: October 14, 2008Assignee: O2Micro International LimitedInventors: You-Yuh Shyr, Sorin Laurentiu Negru
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Publication number: 20080111576Abstract: A programmable after-package, on-chip reference voltage trim circuit for an integrated circuit having a plurality of programmable trim cells generating a programmed sequence. A converter is provided to convert the bit sequence into a trim current. The trim current is added to an initial value of a reference voltage to be trimmed, as generated by the integrated circuit. Once the correct value of the trim current is determined, isolation circuitry is programmed to isolate the trim circuitry from the remainder of the IC, thereby freeing the logic and package pins associated with the IC for use by users of the IC. The preferred trim circuitry includes fuses which are blown in accordance with a bit value supplied to the trim cell to permanently fix a trim current value, once a best fit value is determined.Type: ApplicationFiled: January 15, 2008Publication date: May 15, 2008Applicant: O2MICRO INTERNATIONAL LIMITEDInventors: You-Yuh Shyr, Sorin Negru
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Patent number: 7319346Abstract: A programmable after-package, on-chip reference voltage trim circuit for an integrated circuit having a plurality of programmable trim cells generating a programmed sequence. A converter is provided to convert the bit sequence into a trim current. The trim current is added to an initial value of a reference voltage to be trimmed, as generated by the integrated circuit. Once the correct value of the trim current is determined, isolation circuitry is programmed to isolate the trim circuitry from the remainder of the IC, thereby freeing the logic and package pins associated with the IC for use by users of the IC. The preferred trim circuitry includes fuses which are blown in accordance with a bit value supplied to the trim cell to permanently fix a trim current value, once a best fit value is determined.Type: GrantFiled: January 23, 2004Date of Patent: January 15, 2008Assignee: O2Micro International LimitedInventors: You-Yuh Shyr, Sorin Laurentiu Negru
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Publication number: 20070109184Abstract: A positioning method using global positioning system (GPS) signal and digital broadcasting system (DBS) signal. The method includes detecting a presence status of the GPS signal through a signal detector in a receiver, detecting a presence status of the DBS signal through the signal detector, determining the signal strength of the GPS signal if the GPS signal is detected, determining the signal strength of the DBS signal if the DBS signal is detected, choosing one positioning mode among a plurality of positioning modes in a signal processing unit in the receiver based on signal presence status and the signal strength of a detected signal, and determining a location of the receiver based on the chosen positioning mode. The plurality of positioning modes includes stand-alone GPS mode, assisted GPS (AGPS) mode, assisted GPS positioning with DBS assist mode, DBS positioning with GPS assist mode, stand-alone DBS mode, and assist DBS mode.Type: ApplicationFiled: May 24, 2006Publication date: May 17, 2007Inventors: You-Yuh Shyr, Mingqiang Cheng, Cuichai Ji
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Patent number: 7203048Abstract: A DC to DC controller for controlling an inrush current from a DC to DC converter to a battery system having an internal isolating switch. The DC to DC controller is configured to control the DC to DC converter based on a state of the internal isolating switch. If the switch is open, the DC to DC controller adjusts the output voltage of the DC to DC converter to a predetermined voltage level. Based on the value of such voltage level, in rush current from the DC to DC converter to the battery system can be reduced or eliminated when the isolating switch changes from an open state to a closed state. An electronic device including such a DC to DC controller is provided. Related methods for controlling inrush current are also provided.Type: GrantFiled: May 8, 2003Date of Patent: April 10, 2007Assignee: 02Micro International LimitedInventors: You-Yuh Shyr, Constantin Bucur, Vlad Popescu-Stanesti
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Publication number: 20070072623Abstract: A Global Positioning System (GPS) system comprises a user end, a mobile terminal, a positioning server, a GPS application server, and a base station network. The mobile terminal has a GPS receiver to receive GPS information from a plurality of GPS satellites. The positioning server is coupled to the user end through the network. The GPS application server is coupled to the network for communicating with the positioning server, and has a GPS receiver to receive GPS information from GPS satellites so as to calculate a position of the GPS application server. The geographic position of the GPS application server is known, and GPS assistant information is determined based on the calculated position and the geographic position of the GPS application server. The base station network communicates with the mobile terminal to obtain the GPS information of the mobile terminal and locate the mobile terminal based on the GPS information of the mobile terminal and the GPS assistant information.Type: ApplicationFiled: August 18, 2006Publication date: March 29, 2007Inventors: You-Yuh Shyr, Mingqiang Cheng, Bo Yu
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Publication number: 20060232241Abstract: A current mode charger controller for controlling a DC to DC converter. The current mode charger may include a first error amplifier having an output coupled to a common node. The first error amplifier may be configured to compare a first signal representative of a charging current provided to a rechargeable battery with a maximum charging current and provide a current control signal in response to the comparison. The current mode charger controller may further include an internal compensation network coupled to the common node, and a comparator configured to compare an inductor current signal representative of an inductor current through an inductor of the DC to DC converter with a compensation signal. The need for any external compensation for the current mode charger controller may be eliminated.Type: ApplicationFiled: November 18, 2005Publication date: October 19, 2006Inventors: Chun Lu, You-Yuh Shyr, Alexandru Hartular, Constantin Bucur
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Publication number: 20060087303Abstract: A controller for a DC to DC converter. The controller may comprise linear mode circuitry and switch mode control circuitry. The linear mode control circuitry may be capable of providing a first control signal to a transistor of the DC to DC converter. The transistor may operate in a linear region in response to the first control signal to control an output voltage of the DC to DC converter. The switch mode control circuitry may be capable of providing a second control signal to the transistor of the DC to DC converter. The transistor may turn ON and OFF in response to the second control signal to control the output voltage of the DC to DC converter. One of the linear mode control circuitry and the switch mode control circuitry may be enabled to control the transistor in response to a state of an enable signal received at the controller.Type: ApplicationFiled: February 15, 2005Publication date: April 27, 2006Inventors: Alexandru Hartular, Chun Lu, You-Yuh Shyr, Constantin Bucur
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Publication number: 20060028188Abstract: A controller for a DC to DC converter. The controller may comprise linear mode circuitry and switch mode control circuitry. The linear mode control circuitry may be capable of providing a first control signal to a controlled device of the DC to DC converter. The controlled device may operate as a variable resistor in response to the first control signal to control an output voltage of the DC to DC converter. The switch mode control circuitry may be capable of providing a second control signal to the controlled device of the DC to DC converter. The controlled device may turn ON and OFF in response to the second control signal to control the output voltage of the DC to DC converter. One of the linear mode control circuitry and the switch mode control circuitry may be enabled. The controller may also include protection circuitry.Type: ApplicationFiled: October 13, 2005Publication date: February 9, 2006Inventors: Alexandru Hartular, Chun Lu, You-Yuh Shyr, Constantin Bucur, Vlad Mihail Popescu-Stanesti, Jiwei Chen, Oleg Kobildjanov
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Publication number: 20050270567Abstract: A network comprises a printer, a plurality of workstations and a portable device. A user can execute or generate a print job on the workstation. The print job will be transferred to the printer through the network. The printer will not print the print job until the user brings the portable device into proximity of printer.Type: ApplicationFiled: May 25, 2005Publication date: December 8, 2005Inventors: Sterling Du, You-Yuh Shyr, Gary Wu, Richard Brayden
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Publication number: 20040216019Abstract: A programmable after-package, on-chip reference voltage trim circuit for an integrated circuit having a plurality of programmable trim cells generating a programmed sequence. A converter is provided to convert the bit sequence into a trim current. The trim current is added to an initial value of a reference voltage to be trimmed, as generated by the integrated circuit. Once the correct value of the trim current is determined, isolation circuitry is programmed to isolate the trim circuitry from the remainder of the IC, thereby freeing the logic and package pins associated with the IC for use by users of the IC. The preferred trim circuitry includes fuses which are blown in accordance with a bit value supplied to the trim cell to permanently fix a trim current value, once a best fit value is determined.Type: ApplicationFiled: January 23, 2004Publication date: October 28, 2004Inventors: You-Yuh Shyr, Sorin Laurentiu Negru
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Publication number: 20040080891Abstract: A DC to DC controller for controlling an inrush current from a DC to DC converter to a battery system having an internal isolating switch. The DC to DC controller is configured to control the DC to DC converter based on a state of the internal isolating switch. If the switch is open, the DC to DC controller adjusts the output voltage of the DC to DC converter to a predetermined voltage level. Based on the value of such voltage level, in rush current from the DC to DC converter to the battery system can be reduced or eliminated when the isolating switch changes from an open state to a closed state. An electronic device including such a DC to DC controller is provided. Related methods for controlling inrush current are also provided.Type: ApplicationFiled: May 8, 2003Publication date: April 29, 2004Inventors: You-Yuh Shyr, Constantin Bucur, Vlad Popescu-Stanesti
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Patent number: 6720800Abstract: A programmable after-package, on-chip reference voltage trim circuit for an integrated circuit having a plurality of programmable trim cells generating a programmed sequence. A converter is provided to convert the bit sequence into a trim current. The trim current is added to an initial value of a reference voltage to be trimmed, as generated by the integrated circuit. Once the correct value of the trim current is determined, isolation circuitry is programmed to isolate the trim circuitry from the remainder of the IC, thereby freeing the logic and package pins associated with the IC for use by users of the IC. The preferred trim circuitry includes fuses which are blown in accordance with a bit value supplied to the trim cell to permanently fix a trim current value, once a best fit value is determined.Type: GrantFiled: October 8, 2002Date of Patent: April 13, 2004Assignee: 02Micro International LimitedInventors: You-Yuh Shyr, Sorin Laurentiu Negru
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Publication number: 20030085741Abstract: A programmable after-package, on-chip reference voltage trim circuit for an integrated circuit having a plurality of programmable trim cells generating a programmed sequence. A converter is provided to convert the bit sequence into a trim current. The trim current is added to an initial value of a reference voltage to be trimmed, as generated by the integrated circuit. Once the correct value of the trim current is determined, isolation circuitry is programmed to isolate the trim circuitry from the remainder of the IC, thereby freeing the logic and package pins associated with the IC for use by users of the IC. The preferred trim circuitry includes fuses which are blown in accordance with a bit value supplied to the trim cell to permanently fix a trim current value, once a best fit value is determined.Type: ApplicationFiled: October 8, 2002Publication date: May 8, 2003Inventors: You-Yuh Shyr, Sorin Laurentiu Negru
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Patent number: 6507173Abstract: A power management unit (PMU) apparatus and method may include: a bi-directional pin configured to serve as an input pin during a first condition and as an output pin during a second condition; or a battery charge controller for providing a first conditioning charge and a second full charge to a voltage source of the PMU; or an adapter detector configured to detect the presence of a continuous output adapter and a pulse output adapter; an under voltage lockout protection circuit to prevent start up of the PMU until a power source reaches a predetermined threshold lockout level and to shut down the PMU once the power source reaches a lower threshold lockout disabling level; or a plurality of internal switches for allowing an external switch to have multiple functions; or a power on reset circuit; or multi-output charge status pin.Type: GrantFiled: September 13, 2001Date of Patent: January 14, 2003Assignee: 02 Micro International LimitedInventors: Constantin Spiridon, Vlad Mihail Popescu-Stanesti, You-Yuh Shyr, Alexandru Hartular, William L. Densham, III
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Patent number: 6472897Abstract: A programmable after-package, on-chip reference voltage trim circuit for an integrated circuit having a plurality of programmable trim cells generating a programmed sequence. A converter is provided to convert the bit sequence into a trim current. The trim current is added to an initial value of a reference voltage to be trimmed, as generated by the integrated circuit. Once the correct value of the trim current is determined, isolation circuitry is programmed to isolate the trim circuitry from the remainder of the IC, thereby freeing the logic and package pins associated with the IC for use by users of the IC. The preferred trim circuitry includes fuses which are blown in accordance with a bit value supplied to the trim cell to permanently fix a trim current value, once a best fit value is determined.Type: GrantFiled: January 24, 2000Date of Patent: October 29, 2002Assignee: Micro International LimitedInventors: You-Yuh Shyr, Sorin Laurentiu Negru