Patents by Inventor Sang Ton Ngo
Sang Ton Ngo 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: 8436936Abstract: Embodiments of the present invention include circuits and methods for calibrating position displacement in a voltage controlled actuator. In one embodiment, a calibration circuit comprises an actuator having a control terminal for receiving a programmable control voltage to set a displacement, a switch that selectively decouples said programmable voltage from said control terminal and couples a reference current to said control terminal when the control terminal is decoupled from said control voltage, a comparator that senses a voltage difference between said control voltage and said control terminal, and a timer coupled to an output of the comparator. The timer measures a time period required to increase the control terminal voltage. The capacitance of the actuator may be determined and used to calibrate the position of the actuator.Type: GrantFiled: July 12, 2012Date of Patent: May 7, 2013Assignee: Qualcomm IncorporatedInventors: Sang Ton Ngo, Thomas O'Brien, Sridhar Kotikalapoodi, M Abid Hussain
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Patent number: 8344791Abstract: Embodiments of the present invention include charge pump circuits and methods. In one embodiment, a first charge pump receives a voltage and generates a first charge pump output voltage and current for supplying the power requirements of a circuit. A second charge pump is coupled in series with the first charge pump. The second charge pump generates a second charge pump output voltage and current for supplying different power requirements of the circuit. In one embodiment, the first charge pump provides a high current low voltage output to a first circuit and the second charge pump provides a low current high voltage output to a second circuit. Capacitors of the first charge pump may be external to an integrated circuit and capacitors of the second charge pump may be internal to the integrated circuit.Type: GrantFiled: August 1, 2012Date of Patent: January 1, 2013Assignee: Qualcomm IncorporatedInventors: Kenneth C Adkins, Sang Ton Ngo, M Abid Hussain, Thomas O'Brien, Sridhar Kotikalapoodi, George A Hall
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Publication number: 20120293244Abstract: Embodiments of the present invention include charge pump circuits and methods. In one embodiment, a first charge pump receives a voltage and generates a first charge pump output voltage and current for supplying the power requirements of a circuit. A second charge pump is coupled in series with the first charge pump. The second charge pump generates a second charge pump output voltage and current for supplying different power requirements of the circuit. In one embodiment, the first charge pump provides a high current low voltage output to a first circuit and the second charge pump provides a low current high voltage output to a second circuit. Capacitors of the first charge pump may be external to an integrated circuit and capacitors of the second charge pump may be internal to the integrated circuit.Type: ApplicationFiled: August 1, 2012Publication date: November 22, 2012Applicant: SUMMIT MICROELECTRONICS, INC.Inventors: Kenneth C. Adkins, Sang Ton Ngo, M. Abid Hussain, Thomas O'Brien, Sridhar Kotikalapoodi, George A. Hall
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Publication number: 20120274787Abstract: Embodiments of the present invention include circuits and methods for calibrating position displacement in a voltage controlled actuator. In one embodiment, a calibration circuit comprises an actuator having a control terminal for receiving a programmable control voltage to set a displacement, a switch that selectively decouples said programmable voltage from said control terminal and couples a reference current to said control terminal when the control terminal is decoupled from said control voltage, a comparator that senses a voltage difference between said control voltage and said control terminal, and a timer coupled to an output of the comparator. The timer measures a time period required to increase the control terminal voltage. The capacitance of the actuator may be determined and used to calibrate the position of the actuator.Type: ApplicationFiled: July 12, 2012Publication date: November 1, 2012Inventors: Sang Ton Ngo, Thomas O'Brien, Sridhar Kotikalapoodi, M. Abid Hussain
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Patent number: 8258857Abstract: Embodiments of the present invention include charge pump circuits and methods. In one embodiment, a first charge pump receives a voltage and generates a first charge pump output voltage and current for supplying the power requirements of a circuit. A second charge pump is coupled in series with the first charge pump. The second charge pump generates a second charge pump output voltage and current for supplying different power requirements of the circuit. In one embodiment, the first charge pump provides a high current low voltage output to a first circuit and the second charge pump provides a low current high voltage output to a second circuit. Capacitors of the first charge pump may be external to an integrated circuit and capacitors of the second charge pump may be internal to the integrated circuit.Type: GrantFiled: August 25, 2010Date of Patent: September 4, 2012Assignee: Summit Microelectronics, Inc.Inventors: Kenneth C. Adkins, Sang Ton Ngo, M. Abid Hussain, Thomas O'Brien, Sridhar Kotikalapoodi, George A. Hall
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Patent number: 8237851Abstract: Embodiments of the present invention include circuits and methods for calibrating lens displacement in a voltage controlled actuator. In one embodiment, a calibration circuit comprises a programmable voltage source that provides a voltage to a control terminal of an actuator to set a lens displacement, a switch that selectively decouples said programmable voltage source from said control terminal, a current source that provides a reference current to said control terminal when the control terminal is decoupled from said programmable voltage source, a comparator that senses a voltage difference between said programmable voltage source and said control terminal, and a timer coupled to an output of the comparator. The timer measures a time period required to increase the control terminal voltage. The capacitance of the actuator may be determined and used to calibrate the position of a lens.Type: GrantFiled: July 2, 2009Date of Patent: August 7, 2012Assignee: Summit Microelectronics, IncInventors: Sang Ton Ngo, Thomas O'Brien, Sridhar Kotikalapoodi, M. Abid Hussain
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Publication number: 20120049936Abstract: Embodiments of the present invention include charge pump circuits and methods. In one embodiment, a first charge pump receives a voltage and generates a first charge pump output voltage and current for supplying the power requirements of a circuit. A second charge pump is coupled in series with the first charge pump. The second charge pump generates a second charge pump output voltage and current for supplying different power requirements of the circuit. In one embodiment, the first charge pump provides a high current low voltage output to a first circuit and the second charge pump provides a low current high voltage output to a second circuit. Capacitors of the first charge pump may be external to an integrated circuit and capacitors of the second charge pump may be internal to the integrated circuit.Type: ApplicationFiled: August 25, 2010Publication date: March 1, 2012Applicant: SUMMIT MICROELECTRONICS, INC.Inventors: Kenneth C. Adkins, Sang Ton Ngo, M. Abid Hussain, Thomas O'Brien, Sridhar Kotikalapoodi, George A. Hall
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Publication number: 20110001832Abstract: Embodiments of the present invention include circuits and methods for calibrating lens displacement in a voltage controlled actuator. In one embodiment, a calibration circuit comprises a programmable voltage source that provides a voltage to a control terminal of an actuator to set a lens displacement, a switch that selectively decouples said programmable voltage source from said control terminal, a current source that provides a reference current to said control terminal when the control terminal is decoupled from said programmable voltage source, a comparator that senses a voltage difference between said programmable voltage source and said control terminal, and a timer coupled to an output of the comparator. The timer measures a time period required to increase the control terminal voltage. The capacitance of the actuator may be determined and used to calibrate the position of a lens.Type: ApplicationFiled: July 2, 2009Publication date: January 6, 2011Applicant: Summit Microelectronics, Inc.Inventors: Sang Ton Ngo, Thomas O'Brien, Sridhar Kotikalapoodi, M. Abid Hussain
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Patent number: 6940733Abstract: A switch state controller generating a pulse train is used in a power converter utilizing a plurality of converter stages all simultaneously controlled by a single switch controlled by said pulse train. On time of the pulse train is controlled according to an input or interim node characteristic of the supply and period is controlled by a characteristic of the output of the converter. This allows development of AC-to-DC converters, including power-factor-correction converters, and DC to DC converters with high conversion ratio with minimal parts count & high reliability.Type: GrantFiled: August 22, 2003Date of Patent: September 6, 2005Assignee: Supertex, Inc.Inventors: David Chalmers Schie, Alexander Mednik, James Hung Nguyen, Sang Ton Ngo, Khai Minh Le, Wei Gu, Larry Kerenyi
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Patent number: 6917504Abstract: An apparatus and method for adaptively controlling power supplied to a hot-pluggable subsystem controls the inrush current of the hot-pluggable subsystem when the subsystem is coupled to another system that supplies power, and optionally other signal connections. The apparatus and method adaptively control a pass device by detecting the voltage at the gate of the pass device during initial charging of the gate. The gate voltage may be sampled and used subsequently to control the operation of the pass device, and short-circuit conditions may be detected by determining that the miller effect does not change the charging of the gate capacitance. Automatic restart circuitry can be included to generate multiple startup attempts, and under-voltage lockout circuitry and power-on-reset timers can be used to provide a robust solution. The apparatus and method can be adapted to provide a three terminal device that does not require a feedback connection from a power supply output.Type: GrantFiled: May 2, 2001Date of Patent: July 12, 2005Assignee: Supertex, Inc.Inventors: James Hung Nguyen, Sang Ton Ngo, David Chalmers Schia, Ladislas G. Kerenyi, Khai Minh Le
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Publication number: 20040105283Abstract: A switch state controller generating a pulse train is used in a power converter utilizing a plurality of converter stages all simultaneously controlled by a single switch controlled by said pulse train. On time of the pulse train is controlled according to an input or interim node characteristic of the supply and period is controlled by a characteristic of the output of the converter. This allows development of AC-to-DC converters, including power-factor-correction converters, and DC to DC converters with high conversion ratio with minimal parts count & high reliability.Type: ApplicationFiled: August 22, 2003Publication date: June 3, 2004Inventors: David Chalmers Schie, Alexander Mednik, James Hung Nguyen, Sang Ton Ngo, Khai Minh Le, Wei Gu, Ladislas G. Kerenyi
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Feedback apparatus and method for adaptively controlling power supplied to a hot-pluggable subsystem
Patent number: 6525515Abstract: A feedback apparatus and method for adaptively controlling power supplied to a hot-pluggable subsystem controls the inrush current of the hot-pluggable subsystem upon application of power. The apparatus and method adaptively control a pass device by detecting the current through the pass device during initial charging of a load capacitance and scaling back the turn-on rate at the pass device control terminal input in conformity with the detected current and a predetermined rate set by a ramp generator. A ramp capacitor is coupled to the control terminal of the pass device through a diode to permit use of the capacitor for timing purposes as well as preventing transient turn-on of the pass device during initial application of power.Type: GrantFiled: September 24, 2001Date of Patent: February 25, 2003Assignee: Supertex, Inc.Inventors: Sang Ton Ngo, James Hung Nguyen, David Chalmera Schie, Ladislas G. Kerenyi, Khai Minh Le -
Publication number: 20020166073Abstract: An apparatus and method for adaptively controlling power supplied to a hot-pluggable subsystem controls the inrush current of the hot-pluggable subsystem when the subsystem is coupled to another system that supplies power, and optionally other signal connections. The apparatus and method adaptively control a pass device by detecting the voltage at the gate of the pass device during initial charging of the gate. The gate voltage may be sampled and used subsequently to control the operation of the pass device, and short-circuit conditions may be detected by determining that the miller effect does not change the charging of the gate capacitance. Automatic restart circuitry can be included to generate multiple startup attempts, and under-voltage lockout circuitry and power-on-reset timers can be used to provide a robust solution. The apparatus and method can be adapted to provide a three terminal device that does not require a feedback connection from a power supply output.Type: ApplicationFiled: May 2, 2001Publication date: November 7, 2002Inventors: James Hung Nguyen, Sang Ton Ngo, David Chalmers Schie, Ladislas G. Kerenyi, Khai Minh Le