Patents by Inventor Chi-Mun Ho
Chi-Mun Ho 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: 9077514Abstract: An integrated circuit having a clock synchronizing circuit is described. The clock synchronizing circuit includes an input-output buffer and a plurality of sampling buffer circuits. The input-output buffer receives an input signal and generating an output signal. Each sampling buffer circuit receives the output signal and a sampling clock signal. Each sampling buffer circuit generates a first sampled output by sampling the output signal at the rising edge of the corresponding sampling clock signal and a second sampled output by sampling the output signal on the falling edge of the corresponding sampling clock signal. The sampling clock signal has a predetermined phase difference at each of the plurality of sampling buffer circuits.Type: GrantFiled: January 28, 2014Date of Patent: July 7, 2015Assignee: Altera CorporationInventors: Chi Mun Ho, Kin Hong Au
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Patent number: 7889249Abstract: A system and method for canceling dark photocurrent in a color sensor circuit is disclosed. A color sensor is described including a color sensor circuit, a dark color sensor circuit, and a differential amplifier circuit. The color sensor circuit receives photocurrent from a color component of a light input. The color sensor circuit outputs a first voltage indicating intensity of the color component. The dark color sensor circuit receives dark photocurrent and outputs a second voltage indicating an offset voltage. The differential amplifier circuit is coupled to the color sensor circuit and to the dark color sensor circuit. The differential amplifier circuit receives the first and second voltages and outputs a final output that cancels contributions of the offset voltage in the first voltage due to the dark photocurrent.Type: GrantFiled: July 8, 2010Date of Patent: February 15, 2011Assignee: Avago Technologies ECBU IP (Singapore) Pte. Ltd.Inventors: Boon Keat Tan, Chi Mun Ho, Kevin Len Lim
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Publication number: 20100277624Abstract: A system and method for canceling dark photocurrent in a color sensor circuit is disclosed. A color sensor is described including a color sensor circuit, a dark color sensor circuit, and a differential amplifier circuit. The color sensor circuit receives photocurrent from a color component of a light input. The color sensor circuit outputs a first voltage indicating intensity of the color component. The dark color sensor circuit receives dark photocurrent and outputs a second voltage indicating an offset voltage. The differential amplifier circuit is coupled to the color sensor circuit and to the dark color sensor circuit. The differential amplifier circuit receives the first and second voltages and outputs a final output that cancels contributions of the offset voltage in the first voltage due to the dark photocurrent.Type: ApplicationFiled: July 8, 2010Publication date: November 4, 2010Applicant: Avago Technologies ECBU (Singapore) Pte. LtdInventors: Boon Keat Tan, Chi Mun Ho, Kevin Len Li Lim
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Patent number: 7773134Abstract: A system and method for canceling dark photocurrent in a color sensor circuit is disclosed. A color sensor is described including a color sensor circuit, a dark color sensor circuit, and a differential amplifier circuit. The color sensor circuit receives photocurrent from a color component of a light input. The color sensor circuit outputs a first voltage indicating intensity of the color component. The dark color sensor circuit receives dark photocurrent and outputs a second voltage indicating an offset voltage. The differential amplifier circuit is coupled to the color sensor circuit and to the dark color sensor circuit. The differential amplifier circuit receives the first and second voltages and outputs a final output that cancels contributions of the offset voltage in the first voltage due to the dark photocurrent.Type: GrantFiled: March 15, 2004Date of Patent: August 10, 2010Assignee: Avago Technologies ECBU IP (Singapore) Pte. Ltd.Inventors: Boon Keat Tan, Chi Mun Ho, Kevin Len Li Lim
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Patent number: 7638756Abstract: An optical encoder includes a coding element having a track with multiple transparent sections, a light source positioned to output light to the track, and a photodetector array, positioned to detect light that passes through the transparent sections of the track. The photodetectors of the photodetector array have larger width dimensions than the width dimensions of the transparent sections of the track. Resolution of the optical encoder may be adjusted by changing the resolution of the coding element.Type: GrantFiled: June 17, 2008Date of Patent: December 29, 2009Assignee: Avago Technologies ECBU IP (Singapore) Pte. Ltd.Inventors: Chee Keong Chong, Kay Keat Khoo, Chi Mun Ho
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Patent number: 7491927Abstract: The color sensing circuit includes a light detector to receive light and to generate a signal that is dependent on the received light. The light detector includes a first electrode coupled to a first node and a second electrode coupled to a second predetermined signal. A storage device is provided that includes a first node and a second node coupled to the second predetermined signal. A first switch is provided that selectively couples the first node with the first electrode of the storage device based on a charge control signal. A signal processing circuit is provided that includes a first electrode and an output to generate an output signal that represents the light received by the light detector. A second switch is also provided that selectively couples the first electrode of the storage device with the first electrode of the signal processing circuit based on an evaluate control signal. The signal processing circuit selectively asserts the charge control signal and evaluate control signal.Type: GrantFiled: June 24, 2004Date of Patent: February 17, 2009Assignee: Avago Technologies ECBU IP (Singapore) Pte. Ltd.Inventors: Boon Keat Tan, Chi Mun Ho, Len Li Kevin Lim
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Patent number: 7449675Abstract: An optical encoder includes a coding element having a track with multiple transparent sections, a light source positioned to output light to the track, and a photodetector array, positioned to detect light that passes through the transparent sections of the track. The photodetectors of the photodetector array have larger width dimensions than the width dimensions of the transparent sections of the track. Resolution of the optical encoder may be adjusted by changing the resolution of the coding element.Type: GrantFiled: August 2, 2004Date of Patent: November 11, 2008Assignee: Avago Technologies ECBU IP (Singapore) Pte. Ltd.Inventors: Chee Keong Chong, Kay Keat Khoo, Chi Mun Ho
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Publication number: 20080245956Abstract: An optical encoder includes a coding element having a track with multiple transparent sections, a light source positioned to output light to the track, and a photodetector array, positioned to detect light that passes through the transparent sections of the track. The photodetectors of the photodetector array have larger width dimensions than the width dimensions of the transparent sections of the track. Resolution of the optical encoder may be adjusted by changing the resolution of the coding element.Type: ApplicationFiled: June 17, 2008Publication date: October 9, 2008Inventors: Chee Keong Chong, Kay Keat Khoo, Chi Mun Ho
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Patent number: 7349017Abstract: A color sensor is implemented on a single integrated circuit chip. The color sensor includes a plurality of color sensor circuits and a gain selection control. Each color sensor circuit in the plurality of color sensor circuits includes a light detector, an amplifier and a gain selection circuit. The amplifier is connected to the light detector. The amplifier amplifies a signal from the light detector. The gain selection circuit is connected to the amplifier. The gain selection controls gain of the amplifier. The gain selection circuit includes a variable feedback resistance. The gain selection control selects a separate value of the variable feedback resistance for each color sensor circuit.Type: GrantFiled: April 21, 2004Date of Patent: March 25, 2008Assignee: Avago Technologies ECBU IP Pte LtdInventors: Boon Keat Tan, Chi Mun Ho
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Patent number: 7310090Abstract: A switch panel having a touch plate, image generator, and imaging system. The touch plate includes an optically transparent layer having first and second sides. The optically transparent layer having an index of refraction greater than that of air. A light source generates a light signal that is reflected between the first and second sides of the touch plate within the transparent layer. The imaging system records an image of the first surface. An image generator displays an image that includes a plurality of button positions to a person viewing the touch plate from the first side. A portion of the light signal is reflected toward the second surface at an angle greater than the critical angle in the optically transparent layer when the first surface is touched. The imaging system determines the location of the touch from the location of the reflected light.Type: GrantFiled: March 25, 2004Date of Patent: December 18, 2007Assignee: Avago Technologies ECBM IP (Singapore) Pte Ltd.Inventors: Chi Mun Ho, Chin Hin Oon, Kean Loo Kah
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Patent number: 6980473Abstract: A memory device and a method for compensating for a load current in the memory device. The memory device includes a plurality of I/O buffers where each I/O buffer includes an I/O write-buffer driver circuit. The I/O write-buffer driver circuit is coupled to a load current compensation circuit. Although each I/O buffer includes an I/O write-buffer circuit, a single load current compensation circuit may be coupled to several I/O write-buffer driver circuits. The load current compensation circuit generates a load compensation current for each I/O buffer circuit that is not being programmed. The load compensation current increases the load current so that a drain-side programming voltage (VPROG) drives a substantially constant load current, wherein the drain-side programming voltage is substantially independent of the number of bits being programmed.Type: GrantFiled: October 1, 2003Date of Patent: December 27, 2005Assignee: Advanced Micro Devices, Inc.Inventors: Edward V. Bautista, Jr., Ken Cheong Cheah, Chi-Mun Ho
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Publication number: 20050212774Abstract: A switch panel having a touch plate, image generator, and imaging system. The touch plate includes an optically transparent layer having first and second sides. The optically transparent layer having an index of refraction greater than that of air. A light source generates a light signal that is reflected between the first and second sides of the touch plate within the transparent layer. The imaging system records an image of the first surface. An image generator displays an image that includes a plurality of button positions to a person viewing the touch plate from the first side. A portion of the light signal is reflected toward the second surface at an angle greater than the critical angle in the optically transparent layer when the first surface is touched. The imaging system determines the location of the touch from the location of the reflected light.Type: ApplicationFiled: March 25, 2004Publication date: September 29, 2005Inventors: Chi Mun Ho, Chin Hin Oon, Kean Loo Kah
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Publication number: 20050200732Abstract: A system and method for canceling dark photocurrent in a color sensor circuit is disclosed. A color sensor is described including a color sensor circuit, a dark color sensor circuit, and a differential amplifier circuit. The color sensor circuit receives photocurrent from a color component of a light input. The color sensor circuit outputs a first voltage indicating intensity of the color component. The dark color sensor circuit receives dark photocurrent and outputs a second voltage indicating an offset voltage. The differential amplifier circuit is coupled to the color sensor circuit and to the dark color sensor circuit. The differential amplifier circuit receives the first and second voltages and outputs a final output that cancels contributions of the offset voltage in the first voltage due to the dark photo current.Type: ApplicationFiled: March 15, 2004Publication date: September 15, 2005Inventors: Boon Keat Tan, Chi Mun Ho, Kevin Len Li Lim