Patents by Inventor You Liu
You Liu 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: 7518459Abstract: A harmonic-rejection modulation device is provided, which includes a phase splitter, a low pass filter, and a modulator. Based on a square wave, the phase splitter generates a plurality of unfiltered local oscillating signals having phase angles of 0°, 30°, 90°, 120°, 180°, 210°, 270° and 300°, respectively. The low pass filter filters the high frequency components of the unfiltered local oscillating signals to generate a plurality of local oscillating signals having phase angles of 0°, 30°, 90°, 120°, 180°, 210°, 270° and 300°, respectively. The modulator modulates a baseband signal with the local oscillating signals, wherein the third harmonics of the local oscillating signals are eliminated by the modulation process of the modulator. The invention also provides a method of modulating a baseband signal.Type: GrantFiled: December 15, 2006Date of Patent: April 14, 2009Assignee: Via Technologies Inc.Inventors: Nean-Chu Cheng, Ying-Che Tseng, Sen-You Liu, Did-Min Shih
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Publication number: 20090067567Abstract: A divide-by-N/(N+0.5) frequency divider is disclosed. Two pairs of flip-flops are respectively triggered by an input clock and an inverted input clock, and a frequency-dividing selector is used to select one output of the two pairs of flip-flops as frequency-divided output signal. Two latches are respectively triggered by the input clock and the inverted input clock, and a modulus selector is used to select one output of the two latches. A modulus logic circuit determines being in either N frequency-dividing mode or (N+0.5) frequency-dividing mode based on a modulus control signal. A frequency-dividing logic circuit receives output of the modulus logic circuit and an inverted frequency-divided output signal to swallow half the input clock per output cycle in the (N+0.5) frequency-dividing mode, therefore obtaining division resolution of half the input clock.Type: ApplicationFiled: October 7, 2007Publication date: March 12, 2009Inventor: SEN-YOU LIU
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Patent number: 7492852Abstract: A divide-by-N/(N+0.5) frequency divider is disclosed. Two pairs of flip-flops are respectively triggered by an input clock and an inverted input clock, and a frequency-dividing selector is used to select one output of the two pairs of flip-flops as frequency-divided output signal. Two latches are respectively triggered by the input clock and the inverted input clock, and a modulus selector is used to select one output of the two latches. A modulus logic circuit determines being in either N frequency-dividing mode or (N+0.5) frequency-dividing mode based on a modulus control signal. A frequency-dividing logic circuit receives output of the modulus logic circuit and an inverted frequency-divided output signal to swallow half the input clock per output cycle in the (N+0.5) frequency-dividing mode, therefore obtaining division resolution of half the input clock.Type: GrantFiled: October 7, 2007Date of Patent: February 17, 2009Assignee: Via Technologies, Inc.Inventor: Sen-You Liu
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Patent number: 7444122Abstract: A mobile system has a frequency synthesizer and an amplifier module coupled to the frequency synthesizer. The frequency synthesizer is controlled by frequency division data to generate a tuning signal with a frequency corresponding to a reference signal and the frequency division data. The mobile system provides an input signal based on the frequency of the tuning signal having a frequency spectrum corresponding to the frequency of the tuning signal. The amplifier module has a variable load circuit for providing an equivalent impedance, an amplifier circuit coupled to the variable load circuit for establishing an output signal corresponding to the input signal and the equivalent impedance of the variable load circuit, and a mapping circuit for modifying the equivalent impedance of the variable load circuit based on the frequency division data.Type: GrantFiled: January 31, 2007Date of Patent: October 28, 2008Assignee: VIA Technologies Inc.Inventors: Pi-An Wu, Sen-You Liu
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Patent number: 7388408Abstract: A phase-frequency detector generates output signals at a first and a second output end based on input signals received at a first and a second input end. The phase-frequency detector includes two latch circuits, two pulse generators, two inverting circuits, two sensing devices, and a reset control circuit. The sensing devices control the pulse generators based on signals received at corresponding first ends of the sensing devices. The inverting circuits generate signals to the first and second output ends of the phase-frequency detector based on signals received at corresponding first ends of the inverting circuits. The reset control circuit generates reset signals based on signals received at the first and second output ends of the phase-frequency detector.Type: GrantFiled: December 26, 2006Date of Patent: June 17, 2008Assignee: VIA Technologies Inc.Inventors: Sen-You Liu, Pi-An Wu
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Patent number: 7362179Abstract: A power amplifier circuit amplifying an input signal to an output signal and a method thereof. The power amplifier circuit comprises a ramp controller, a current source, and a first amplification stage. The ramp controller receives an enable signal to generate a ramp signal. The current source is coupled to the ramp controller, produces a ramp current by the ramp signal. The first amplification stage is coupled to the current source, comprises a first supply voltage input coupled to a fixed supply voltage, and is biased by the ramp current to amplify the input signal such that an envelope of the output signal is a ramp.Type: GrantFiled: January 19, 2006Date of Patent: April 22, 2008Assignee: Via Technologies Inc.Inventors: Jung-Chang Liu, Che-Hung Liao, Sen-You Liu, Did-Min Shih
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Publication number: 20080012648Abstract: A mobile system has a frequency synthesizer and an amplifier module coupled to the frequency synthesizer. The frequency synthesizer is controlled by frequency division data to generate a tuning signal with a frequency corresponding to a reference signal and the frequency division data. The mobile system provides an input signal based on the frequency of the tuning signal having a frequency spectrum corresponding to the frequency of the tuning signal. The amplifier module has a variable load circuit for providing an equivalent impedance, an amplifier circuit coupled to the variable load circuit for establishing an output signal corresponding to the input signal and the equivalent impedance of the variable load circuit, and a mapping circuit for modifying the equivalent impedance of the variable load circuit based on the frequency division data.Type: ApplicationFiled: January 31, 2007Publication date: January 17, 2008Inventors: Pi-An Wu, Sen-You Liu
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Patent number: 7317689Abstract: High-speed transceiver devices, such as GBIC-type transceivers, are accessed and addressed. Identification information (including manufacturer name, model, compliance codes) is placed in data fields of the transceivers. An algorithm checks each port in each module of a host system to determine if a transceiver is present. If a particular transceiver is present, then algorithms store the port address of the transceiver in memory and enable the transceiver to be read from or written to. Reading from the transceiver includes reading the identification information, and writing to the transceiver includes writing the identification information. If a transceiver is initially determined not to be present or if the reading/writing/enabling processes fail, then a recovery process determines if the transceiver was present the last time it was checked. If it was present the last time, then the process continues to try to recover the transceiver data—otherwise, the port is marked as empty.Type: GrantFiled: February 10, 2003Date of Patent: January 8, 2008Assignee: Foundry Networks, Inc.Inventor: Patrick Chung-You Liu
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Publication number: 20070268050Abstract: A phase-frequency detector generates output signals at a first and a second output end based on input signals received at a first and a second input end. The phase-frequency detector includes two latch circuits, two pulse generators, two inverting circuits, two sensing devices, and a reset control circuit. The sensing devices control the pulse generators based on signals received at corresponding first ends of the sensing devices. The inverting circuits generate signals to the first and second output ends of the phase-frequency detector based on signals received at corresponding first ends of the inverting circuits. The reset control circuit generates reset signals based on signals received at the first and second output ends of the phase-frequency detector.Type: ApplicationFiled: December 26, 2006Publication date: November 22, 2007Inventors: Sen-You Liu, Pi-An Wu
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Publication number: 20070242775Abstract: A harmonic-rejection modulation device is provided, which includes a phase splitter, a low pass filter, and a modulator. Based on a square wave, the phase splitter generates a plurality of unfiltered local oscillating signals having phase angles of 0°, 30°, 90°, 120°, 180°, 210°, 270° and 300°, respectively. The low pass filter filters the high frequency components of the unfiltered local oscillating signals to generate a plurality of local oscillating signals having phase angles of 0°, 30°, 90°, 120°, 180°, 210°, 270° and 300°, respectively. The modulator modulates a baseband signal with the local oscillating signals, wherein the third harmonics of the local oscillating signals are eliminated by the modulation process of the modulator. The invention also provides a method of modulating a baseband signal.Type: ApplicationFiled: December 15, 2006Publication date: October 18, 2007Applicant: VIA TECHNOLOGIES, INC.Inventors: Nean-Chu Cheng, Ying-Che Tseng, Sen-You Liu, Did-Min Shih
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Patent number: 7159995Abstract: A display device and light source thereof. The light source is disposed in a housing. An electrode is connected to the light source. A first connecting portion having a first threaded surface is connected to the electrode. A second connecting portion having a second threaded surface is connected to an electric wire. The first threaded surface is electrically connected to the second threaded surface to connect the electric wire and the light source.Type: GrantFiled: September 13, 2004Date of Patent: January 9, 2007Assignee: AU Optronics Corp.Inventors: Kai-Yu Sun, Cheng-You Liu
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Patent number: 7131750Abstract: A backlight apparatus includes a plurality of support members that maintain a diffuser plate in a fixed and level position with respect to the lamps and the housing that contains the lamps, to produce uniform illumination. The support members extend from the diffuser plate disposed at an open face of the housing, to the opposed back part of the housing, and include male-female interlocking parts to provide support. The support members include a set of cooperating portions, an upper and lower portion. The upper and lower portions may combine to provide a cavity in the support member. A cold cathode fluorescent lamp may extend through the cavity and the upper and lower portions may be secured to the diffuser plate and housing, respectively, by extending through openings formed in the diffuser plate or housing.Type: GrantFiled: July 29, 2004Date of Patent: November 7, 2006Assignee: AU Optronics CorporationInventors: Cheng-You Liu, Kai-Yu Sun
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Publication number: 20060164168Abstract: A power amplifier circuit amplifying an input signal to an output signal and a method thereof. The power amplifier circuit comprises a ramp controller, a current source, and a first amplification stage. The ramp controller receives an enable signal to generate a ramp signal. The current source is coupled to the ramp controller, produces a ramp current by the ramp signal. The first amplification stage is coupled to the current source, comprises a first supply voltage input coupled to a fixed supply voltage, and is biased by the ramp current to amplify the input signal such that an envelope of the output signal is a ramp.Type: ApplicationFiled: January 19, 2006Publication date: July 27, 2006Inventors: Jung-Chang Liu, Che-Hung Liao, Sen-You Liu, Did-Min Shih
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Publication number: 20060148421Abstract: A method and an apparatus for shifting a resonance frequency in response to an operating frequency are provided. The present invention retrieves a control signal, from a frequency synthesizer, indicative of a difference between the operating frequency and a predetermined frequency, decodes the control signal to generate a tuning signal by looking up a mapping table, and tunes the resonance frequency in response to the tuning signal.Type: ApplicationFiled: January 4, 2005Publication date: July 6, 2006Inventors: Patrick Huang, Wen-Chang Lee, Sen-You Liu
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Publication number: 20060023472Abstract: A backlight apparatus includes a plurality of support members that maintain a diffuser plate in a fixed and level position with respect to the lamps and the housing that contains the lamps, to produce uniform illumination. The support members extend from the diffuser plate disposed at an open face of the housing, to the opposed back part of the housing, and include male-female interlocking parts to provide support. The support members include a set of cooperating portions, an upper and lower portion. The upper and lower portions may combine to provide a cavity in the support member. A cold cathode fluorescent lamp may extend through the cavity and the upper and lower portions may be secured to the diffuser plate and housing, respectively, by extending through openings formed in the diffuser plate or housing.Type: ApplicationFiled: July 29, 2004Publication date: February 2, 2006Inventors: Cheng-You Liu, Kai-Yu Sun
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Publication number: 20050276049Abstract: A display device and light source thereof. The light source is disposed in a housing. An electrode is connected to the light source. A first connecting portion having a first threaded surface is connected to the electrode. A second connecting portion having a second threaded surface is connected to an electric wire. The first threaded surface is electrically connected to the second threaded surface to connect the electric wire and the light source.Type: ApplicationFiled: September 13, 2004Publication date: December 15, 2005Inventors: Kai-Yu Sun, Cheng-You Liu
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Publication number: 20040037438Abstract: A method, apparatus, and system for reducing audio signal noise in a communication system includes, biasing (214)an audio signal noise level beyond a transmission device (200) operating range to condition an audio signal intended to be received by a receiving device (400) having an operating range including the audio signal noise level.Type: ApplicationFiled: August 20, 2002Publication date: February 26, 2004Inventors: Hong You Liu, Xiao Bang Qian, Kai Young Lu, Simon Lee Guan Huat
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Patent number: 6576333Abstract: This invention provides a composite material having a matrix of structural material containing embedded zones of soft elastic material and zones of solid relatively high density material within the soft elastic material. By selecting a particular resonance frequency for the subunits of soft elastic material and solid high density material, frequencies just lower than the resonance frequencies will be unable to propagate through the material and be strongly reflected or absorbed. Such material may be used in the manufacture of filters or shields against particular target frequencies. Subunits having a variety of resonance frequencies may provide a broader range of frequencies that the material may shield.Type: GrantFiled: April 3, 1998Date of Patent: June 10, 2003Assignee: The Hong Kong University of Science & TechnologyInventors: Ping Sheng, Rongfu Xiao, Weijia Wen, Zheng You Liu
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Publication number: 20020114928Abstract: This invention provides a composite material having a matrix of structural material containing embedded zones of soft elastic material and zones of solid relatively high density material within the soft elastic material. By selecting a particular resonance frequency for the subunits of soft elastic material and solid high density material, frequencies just lower than the resonance frequencies will be unable to propagate through the material and be strongly reflected or absorbed. Such material may be used in the manufacture of filters or shields against particular target frequencies. Subunits having a variety of resonance frequencies may provide a broader range of frequencies that the material may shield.Type: ApplicationFiled: April 3, 1998Publication date: August 22, 2002Inventors: PING SHENG, RONGFU XIAO, WEIJIA WEN, ZHENG YOU LIU