Patents by Inventor Yen-Chang Tung
Yen-Chang Tung 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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Publication number: 20110168458Abstract: The invention relates to a detecting apparatus of a capacitive touch panel for detecting at least one touched position executed by a user on the capacitive touch panel including a plurality of sensing elements. The detecting apparatus comprises a first detecting module, a judging module, a second detecting module and a determining module. The first detecting module detects the plurality of sensing elements to generate a plurality of first detecting signals. The judging module generates a plurality of judging signals according to the plurality of first detecting signals. The second detecting module detects at least one sensing element of the plurality of sensing elements according to the plurality of judging signals to generate at least one second detecting signal. The determining module determines the at least one touched position executed by the user on the capacitive touch panel according to the at least one second detecting signal.Type: ApplicationFiled: March 19, 2010Publication date: July 14, 2011Applicant: IdeaCom Technology CorporationInventors: Hung-Yi Lin, Yen-Chang Tung
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Patent number: 7639087Abstract: A phase-locked loop including a phase comparator, a charging/discharging unit, a low pass filter, a controlled oscillator, and a feedback unit is provided. The charging/discharging unit outputs a control signal according to the result of the phase comparator. The charging/discharging unit includes a compensation unit for compensating the control signal according to a compensation value. The controlled oscillator is electrically connected to the low pass filter and outputs an output signal. The controlled oscillator includes a copy unit which is electrically connected to the compensation unit to determine the compensation value according to an internal current of the controlled oscillator.Type: GrantFiled: February 5, 2007Date of Patent: December 29, 2009Assignee: Sunplus Technology Co., Ltd.Inventor: Yen-Chang Tung
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Patent number: 7463101Abstract: A voltage control oscillator, outputting a clocking signal with a specific frequency according to an input voltage level, has a constant current source, a voltage/current converter, a current mirror and an oscillating circuit. The constant current source provides a predetermined reference current. The voltage/current converter is coupled to the constant current source, for determining a first current flowing through the voltage/current converter according to the input voltage. The current mirror has a first current terminal coupled to the constant current source, for determining a third current flowing through a second current terminal according to the second current flowing through the first current terminal, wherein the second current is the reference current subtracted by the first current. The oscillating circuit is coupled to the second current terminal of the current mirror, for determining a frequency of the clocking signal according to the third current.Type: GrantFiled: September 15, 2004Date of Patent: December 9, 2008Assignee: Sunplus Technology Co., Ltd.Inventor: Yen-Chang Tung
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Publication number: 20080042758Abstract: A phase-locked loop including a phase comparator, a charging/discharging unit, a low pass filter, a controlled oscillator, and a feedback unit is provided. The charging/discharging unit outputs a control signal according to the result of the phase comparator. The charging/discharging unit includes a compensation unit for compensating the control signal according to a compensation value. The controlled oscillator is electrically connected to the low pass filter and outputs an output signal. The controlled oscillator includes a copy unit which is electrically connected to the compensation unit to determine the compensation value according to an internal current of the controlled oscillator.Type: ApplicationFiled: February 5, 2007Publication date: February 21, 2008Applicant: SUNPLUS TECHNOLOGY CO., LTD.Inventor: Yen-Chang Tung
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Publication number: 20050258910Abstract: A voltage control oscillator, outputting a clocking signal with a specific frequency according to an input voltage level, has a constant current source, a voltage/current converter, a current mirror and an oscillating circuit. The constant current source provides a predetermined reference current. The voltage/current converter is coupled to the constant current source, for determining a first current flowing through the voltage/current converter according to the input voltage. The current mirror has a first current terminal coupled to the constant current source, for determining a third current flowing through a second current terminal according to the second current flowing through the first current terminal, wherein the second current is the reference current subtracted by the first current. The oscillating circuit is coupled to the second current terminal of the current mirror, for determining a frequency of the clocking signal according to the third current.Type: ApplicationFiled: September 15, 2004Publication date: November 24, 2005Inventor: Yen-Chang Tung
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Patent number: 6861918Abstract: A compensation circuit for current control oscillator to correct the frequency curve of an oscillator includes a compensation circuit which has a plurality of P transistors and N transistors to improve stabilization of output frequency of the digital current control oscillator and to prevent the digital current control oscillator from occurring unlatching phenomenon in certain frequency zones.Type: GrantFiled: June 6, 2003Date of Patent: March 1, 2005Assignee: ENE Technology Inc.Inventor: Yen-Chang Tung
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Publication number: 20040051596Abstract: A compensation circuit for current control oscillator to correct the frequency curve of an oscillator includes a compensation circuit which has a plurality of P transistors and N transistors to improve stabilization of output frequency of the digital current control oscillator and to prevent the digital current control oscillator from occurring unlatching phenomenon in certain frequency zones.Type: ApplicationFiled: June 6, 2003Publication date: March 18, 2004Applicant: ENE Technology Inc.Inventor: Yen-Chang Tung
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Publication number: 20030042969Abstract: The present invention provides an improved current mirror circuit. For example, in a voltage controlled oscillator of a phased-locked loop circuit, MOS device is used to replace a fixed resistor in the control circuit before the current mirror circuit for controlling the mirror currents of the related MOS devices in the phased-locked loop circuit, and for controlling the operating frequency of the phased-locked loop circuit.Type: ApplicationFiled: September 5, 2001Publication date: March 6, 2003Applicant: Media Scope Technologies CorpInventors: Alex Yu-Kwen Su, Yen Chang Tung
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Patent number: 6452430Abstract: MOS devices are added respectively to each stage of the voltage-controlled oscillator in a phase-locked loop circuit for improving the operating frequency range and the stability of middle/low frequency thereof, and for continuously and accurately adjusting the frequency.Type: GrantFiled: August 23, 2001Date of Patent: September 17, 2002Assignee: Media Scope Technologies CorporationInventors: Yen Chang Tung, Alex Yu-Kwen Su