Patents by Inventor Lian-Chun Xu
Lian-Chun Xu 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: 8020049Abstract: An Electrical Fast Transient/Burst (EFT/B) detection and recovery system for a Universal Serial Bus (USB) device. The system includes a USB core and a burst controller. The USB core provides serial communications with a host device through a USB data channel. The burst controller is coupled to the USB core. The burst controller detects an EFT/B event and automatically reconnects the USB core to the host device in response to recognition of a suspend state of the USB core by the host device.Type: GrantFiled: December 18, 2008Date of Patent: September 13, 2011Assignee: Avago Technologies ECBU IP (Singapore) Pte. Ltd.Inventors: John Julius Asuncion, Wai Keat Tai, Shan Chong Tan, Lian Chun Xu
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Patent number: 7965277Abstract: An optical navigation system and method of controlling the light output power of the system uses an optical feedback system to control the driving signal being applied to a light source of the optical navigation system.Type: GrantFiled: December 22, 2006Date of Patent: June 21, 2011Assignee: Avago Technologies ECBU IP (Singapore) Pte. Ltd.Inventors: Kwang Beng Ooi, Shan Chong Tan, John Julius Asuncion, Lian Chun Xu
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Publication number: 20100162054Abstract: An Electrical Fast Transient/Burst (EFT/B) detection and recovery system for a Universal Serial Bus (USB) device. The system includes a USB core and a burst controller. The USB core provides serial communications with a host device through a USB data channel. The burst controller is coupled to the USB core. The burst controller detects an EFT/B event and automatically reconnects the USB core to the host device in response to recognition of a suspend state of the USB core by the host device.Type: ApplicationFiled: December 18, 2008Publication date: June 24, 2010Applicant: Avago Technologies ECBU IP (Singapore) Pte. Ltd.Inventors: John Julius Asuncion, Wai Keat Tai, Shan Chong Tan, Lian Chun Xu
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Patent number: 7570109Abstract: A system and method for demodulating amplitude modulated input signals uses two comparators and a charge pump circuit, which is positioned between the two comparators, to produce a demodulated signal of an amplitude modulated input signal. The two comparators and the charge pump circuit form a demodulating unit that may be a part of an infrared remote control receiver. The first comparator converts the input signal from a waveform to a pulse form. The charge pump circuit then converts the pulse signal into an integrated signal in a triangular pulse form. The second comparator converts the integrated signal from a triangular pulse form to a rectangular pulse form to produce the demodulated signal.Type: GrantFiled: November 4, 2005Date of Patent: August 4, 2009Assignee: Lite-On Technology Corp.Inventors: Lian-Chun Xu, Kok-Soon Yeo, Chee-Keong Teo, John Julius Asuncion, Wai Keat Tai
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Patent number: 7561812Abstract: An optical receiver has a voltage supply, a first node, and a second node. A first input of a differential amplifier is coupled to the first node and a second input of the differential amplifier is coupled to the second node. A photodetector is coupled between the voltage supply and the first node, which produces a photodetector capacitance. A programmable variable capacitor having a capacitance selectively matched to the photodetector capacitance is coupled between the voltage supply and the second node.Type: GrantFiled: October 13, 2005Date of Patent: July 14, 2009Assignee: Lite-On Technology Corp.Inventors: Wai Keat Tai, Kok Soon Yeo, Chee Keong Teo, John Julius Asuncion, Lian Chun Xu
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Publication number: 20080149814Abstract: An optical navigation system and method of controlling the light output power of the system uses an optical feedback system to control the driving signal being applied to a light source of the optical navigation system.Type: ApplicationFiled: December 22, 2006Publication date: June 26, 2008Inventors: Kwang Beng Ooi, Shan Chong Tan, John Julius Asuncion, Lian Chun Xu
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Patent number: 7309852Abstract: In one embodiment, an optical transducer, such as an infrared transducer, generates an output signal that is representative of optical irradiance. A noise control circuit is coupled in a power supply path of the optical transducer. A switching circuit varies the noise control provided by the noise control circuit, in response to changes in the output signal of the optical transducer. The noise control may be varied in a number of different ways, including: turning the noise control on or off, varying the noise control in discrete steps, or varying the noise control in a continuous manner. Methods for varying noise control in response to optical irradiance of an optical transducer are also disclosed.Type: GrantFiled: October 18, 2004Date of Patent: December 18, 2007Assignee: Avago Technologies ECBU IP (Singapore) Pte Ltd.Inventors: Kok-Soon Yeo, Lian-Chun Xu, Chee-Keong Teo, John Julius De Leon Asuncion
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Publication number: 20070205826Abstract: A system and method for demodulating amplitude modulated input signals uses two comparators and a charge pump circuit, which is positioned between the two comparators, to produce a demodulated signal of an amplitude modulated input signal. The two comparators and the charge pump circuit form a demodulating unit that may be a part of an infrared remote control receiver. The first comparator converts the input signal from a waveform to a pulse form. The charge pump circuit then converts the pulse signal into an integrated signal in a triangular pulse form. The second comparator converts the integrated signal from a triangular pulse form to a rectangular pulse form to produce the demodulated signal.Type: ApplicationFiled: November 4, 2005Publication date: September 6, 2007Inventors: Lian-Chun Xu, Kok-Soon Yeo, Chee-Keong Teo, John Asuncion, Wai Tai
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Patent number: 7265626Abstract: A fast-settling digital automatic gain control circuit comprises first and second gain-controllable amplifiers in series. Each amplifier can be digitally switched between minimum and maximum gains by control logic that receives inputs from a multi-level voltage comparator. A peak detector connected to the output of the first gain-controlled amplifier is used to set the overall operating ranges for several threshold detectors. Four reference voltages are generated from the peak detector. The highest reference voltage is used to clock and reset the gain control logic with a hysteresis comparator to the instantaneous input signal from the first gain-controlled amplifier. The three other lower reference voltages are used to provide three-bits of digital input data to the gain control logic. Two digital controls are output, a min/max gain bit for the first gain-controlled amplifier, and a similar min/max gain bit for the second gain-controlled amplifier.Type: GrantFiled: December 20, 2005Date of Patent: September 4, 2007Assignee: Avago Technologies ECBU IP (Singapore) Pte. Ltd.Inventors: Chee Keong Teo, Lian-Chun Xu, Kok-Soon Yeo, John Julius Asuncion, Wai Keat Tai
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Publication number: 20070139118Abstract: A fast-settling digital automatic gain control circuit comprises first and second gain-controllable amplifiers in series. Each amplifier can be digitally switched between minimum and maximum gains by control logic that receives inputs from a multi-level voltage comparator. A peak detector connected to the output of the first gain-controlled amplifier is used to set the overall operating ranges for several threshold detectors. Four reference voltages are generated from the peak detector. The highest reference voltage is used to clock and reset the gain control logic with a hysteresis comparator to the instantaneous input signal from the first gain-controlled amplifier. The three other lower reference voltages are used to provide three-bits of digital input data to the gain control logic. Two digital controls are output, a min/max gain bit for the first gain-controlled amplifier, and a similar min/max gain bit for the second gain-controlled amplifier.Type: ApplicationFiled: December 20, 2005Publication date: June 21, 2007Inventors: Chee Teo, Lian-Chun Xu, Kok-Soon Yeo, John Asuncion, Wai Tai
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Patent number: 7220953Abstract: A circuit has a voltage source, a node, a photodetector electrically coupled between the voltage source and the node, a resistor electrically coupled between the node and ground, and a voltage clamp electrically connected to the node, the voltage clamp configured to maintain a reverse bias of the photodetector above a predetermined level.Type: GrantFiled: March 18, 2005Date of Patent: May 22, 2007Assignee: Avago Technologies ECBU IP (Singapore) Pte. Ltd.Inventors: Chee Keong Teo, John Julius Asuncion, Kok Soon Yeo, Lian Chun Xu, Wai Keat Tal
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Patent number: 7215151Abstract: A multi-stage light emitting diode (LED) driver circuit is provided. The circuit includes a driver transistor coupled to an LED. The LED is coupled at a drain of the driver transistor and the driver transistor drives current to the LED. A first transistor stack is coupled between a gate of the driver transistor and ground. A first inverter stage is coupled to a common gate of the first transistor stack. The first inverter stage is further coupled between a high voltage source and ground. A second inverter stage is coupled to a common gate of the first inverter stage. The second inverter stage is further coupled between the high voltage source and ground. The circuit further includes a first transistor coupled between the high voltage source and gate of the driver transistor. The gate of the transistor is coupled to the first inverter stage.Type: GrantFiled: July 22, 2005Date of Patent: May 8, 2007Assignee: Avago Technologies ECBU IP (Singapore) Pte. Ltd.Inventors: Wai Keat Tai, Kok-Soon Yeo, Chee-Keong Teo, John J. De Leon Asuncion, Lian-Chun Xu
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Patent number: 7187223Abstract: In one embodiment, a comparator is provided with a first differential input stage that receives an input voltage and a reference voltage and produces a first differential output, and a second differential input stage that has differential inputs and produces a second differential output. A comparator stage produces a comparator output in response to the first and second differential outputs. The comparator also has a hysteresis control circuit, the components of which include 1) a resistor and a hysteresis regulating voltage input, coupled between the differential inputs of the second differential input stage, 2) first and second current generators, and 3) at least one switch, under control of the comparator output, to alternately enable different combinations of the first and second current generators, thereby inducing a first or a second current through the resistor.Type: GrantFiled: February 14, 2005Date of Patent: March 6, 2007Assignee: Avago Technologies ECBU (IP) Singapore Pte. Ltd.Inventors: Kok-Soon Yeo, Lian-Chun Xu, Chee-Keong Teo, John Julius de Leon Asuncion, Wai-Keat Tai
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Publication number: 20070040543Abstract: A bandgap circuit includes a current mirror that generates a proportional to absolute temperature current at an output node that outputs the bandgap reference voltage. A first current path including a first resistor is coupled between the output node and a first bipolar transistor. The second current path including a second resistor is coupled between the output node and a second bipolar transistor. The first current path is parallel to the second current path. The circuit outputs a bandgap reference voltage.Type: ApplicationFiled: August 16, 2005Publication date: February 22, 2007Inventors: Kok-Soon Yeo, Lian-Chun Xu, Wai Tai, Chee-Keong Teo, John Asuncion
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Publication number: 20070018685Abstract: A multi-stage light emitting diode (LED) driver circuit is provided. The circuit includes a driver transistor coupled to an LED. The LED is coupled at a drain of the driver transistor and the driver transistor drives current to the LED. A first transistor stack is coupled between a gate of the driver transistor and ground. A first inverter stage is coupled to a common gate of the first transistor stack. The first inverter stage is further coupled between a high voltage source and ground. A second inverter stage is coupled to a common gate of the first inverter stage. The second inverter stage is further coupled between the high voltage source and ground. The circuit further includes a first transistor coupled between the high voltage source and gate of the driver transistor. The gate of the transistor is coupled to the first inverter stage.Type: ApplicationFiled: July 22, 2005Publication date: January 25, 2007Inventors: Wai Tai, Kok-Soon Yeo, Chee-Keong Teo, John De Leon Asuncion, Lian-Chun Xu
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Publication number: 20060181314Abstract: In one embodiment, a comparator is provided with a first differential input stage that receives an input voltage and a reference voltage and produces a first differential output, and a second differential input stage that has differential inputs and produces a second differential output. A comparator stage produces a comparator output in response to the first and second differential outputs. The comparator also has a hysteresis control circuit, the components of which include 1) a resistor and a hysteresis regulating voltage input, coupled between the differential inputs of the second differential input stage, 2) first and second current generators, and 3) at least one switch, under control of the comparator output, to alternately enable different combinations of the first and second current generators, thereby inducing a first or a second current through the resistor.Type: ApplicationFiled: February 14, 2005Publication date: August 17, 2006Inventors: Kok-Soon Yeo, Lian-Chun Xu, Chee-Keong Teo, John Julius de Asuncion, Wai-Keat Tai
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Publication number: 20060081779Abstract: In one embodiment, an optical transducer, such as an infrared transducer, generates an output signal that is representative of optical irradiance. A noise control circuit is coupled in a power supply path of the optical transducer. A switching circuit varies the noise control provided by the noise control circuit, in response to changes in the output signal of the optical transducer. The noise control may be varied in a number of different ways, including: turning the noise control on or off, varying the noise control in discrete steps, or varying the noise control in a continuous manner. Methods for varying noise control in response to optical irradiance of an optical transducer are also disclosed.Type: ApplicationFiled: October 18, 2004Publication date: April 20, 2006Inventors: Kok-Soon Yeo, Lian-Chun Xu, Chee-Keong Teo, John Asuncion