Patents by Inventor Shoufang Chen
Shoufang Chen 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: 8880335Abstract: A navigating system with RFID function includes a GPS module for receiving a plurality of satellite signals for location, and an RFID reader for receiving an RFID signal. The navigating system performs navigation according to a first position information and the location function of the GPS module if the RFID signal includes the first position information.Type: GrantFiled: November 30, 2007Date of Patent: November 4, 2014Assignee: MStar Semiconductor, Inc.Inventors: Chao-Tung Yang, ShouFang Chen
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Patent number: 8258925Abstract: A frequency synthesizer for providing clock signals with different frequencies for corresponding band transceivers and associated frequency synthesizing method are provided. The frequency synthesizer includes a phase-locked loop module having a single voltage controlled oscillator, a first frequency divider and a second frequency divider. At first, the single voltage controlled oscillator is activated to generate a primary clock signal. The first frequency divider frequency-divides the primary clock signal to generate a first clock signal for a first band transceiver. The first clock signal is further frequency-divided into a second clock signal for a second band transceiver. Therefore, the frequency synthesizer with the single voltage controlled oscillator can generate clock signals covering more than one frequency band.Type: GrantFiled: March 28, 2008Date of Patent: September 4, 2012Assignee: MSTAR Semiconductor, Inc.Inventors: Christopher Tin Sing Lam, Shoufang Chen
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Patent number: 8150349Abstract: An apparatus and method for audio conversion is provided to upgrade the resolution of transmission frequency of an FM (frequency modulation) transmitter and reduce the size of the FM transmitter by applying frequency coarse tune and fine tune. The apparatus comprises a digital FM modulator, a digital frequency synthesizer, a signal converter, and an analog frequency converter. The digital FM modulator modulates a digital audio input signal into a first digital audio signal. The digital frequency synthesizer converts the first digital audio signal into a second digital audio signal, whose frequency is determined according to a first frequency conversion parameter. The signal converter converts the second digital audio signal into an analog audio signal. The analog frequency converter generates an audio transmission signal with a predetermined frequency according to a second clock signal and the analog audio signal while the second clock signal is generated according to a first clock signal.Type: GrantFiled: June 27, 2008Date of Patent: April 3, 2012Assignee: MStar Semiconductor, IncInventor: ShouFang Chen
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Patent number: 8120531Abstract: A signal processing apparatus for a multi-mode satellite positioning system includes a band-pass filter, a local oscillator circuit, a first mixing circuit, a second mixing circuit, an analog-to-digital converter and a baseband circuit. By properly allocating a local frequency, radio frequency (RF) signals of a Global Positioning System (GPS), a Galileo positioning system and a Global Navigation System (GLONASS) are processed via a single signal path to save hardware cost.Type: GrantFiled: March 8, 2010Date of Patent: February 21, 2012Assignee: MStar Semiconductor, Inc.Inventors: Chao-Tung Yang, Fu-Cheng Wang, Shoufang Chen, Shuo-Yuan Hsiao
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Publication number: 20110116655Abstract: An apparatus and method for audio conversion is provided to upgrade the resolution of transmission frequency of an FM (frequency modulation) transmitter and reduce the size of the FM transmitter by applying frequency coarse tune and fine tune. The apparatus comprises a digital FM modulator, a digital frequency synthesizer, a signal converter, and an analog frequency converter. The digital FM modulator modulates a digital audio input signal into a first digital audio signal. The digital frequency synthesizer converts the first digital audio signal into a second digital audio signal, whose frequency is determined according to a first frequency conversion parameter. The signal converter converts the second digital audio signal into an analog audio signal. The analog frequency converter generates an audio transmission signal with a predetermined frequency according to a second clock signal and the analog audio signal while the second clock signal is generated according to a first clock signal.Type: ApplicationFiled: June 27, 2008Publication date: May 19, 2011Inventor: ShouFang CHEN
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Publication number: 20100302100Abstract: A signal processing apparatus for a multi-mode satellite positioning system includes a band-pass filter, a local oscillator circuit, a first mixing circuit, a second mixing circuit, an analog-to-digital converter and a baseband circuit. By properly allocating a local frequency, radio frequency (RF) signals of a Global Positioning System (GPS), a Galileo positioning system and a Global Navigation System (GLONASS) are processed via a single signal path to save hardware cost.Type: ApplicationFiled: March 8, 2010Publication date: December 2, 2010Applicant: MStar Semiconductor, Inc.Inventors: CHAO-TUNG YANG, Fu-Cheng Wang, Shoufang Chen, Shuo-Yuan Hsiao
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Patent number: 7821455Abstract: A hybrid Global Positioning System (GPS) receiving method, and associated GPS receiving apparatus is provided. The GPS receiving apparatus includes an RF front-end circuit, a correlation circuit, an acquisition engine and a bidirectional interface control unit. The RF front-end receiving circuit receives a satellite signal and converts the same into a baseband signal. The acquisition engine, coupled to the correlation circuit, determines reception power of the GPS satellite signal. The interface control unit, coupled to the acquisition engine, provides a low-speed interface for transmitting GPS intermediate data that includes a code bin, a frequency bin, navigation data, a local system time and a GPS time. The interface control unit includes a memory interface unit for coupling to a memory.Type: GrantFiled: December 29, 2008Date of Patent: October 26, 2010Assignee: Mstar Semiconductor, Inc.Inventors: Shoufang Chen, Ying-Lin Lai, Jia-Yi Chen, Chao-Tung Yang, Chiung Hung Chang
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Patent number: 7809334Abstract: The present invention provides a signal emitting and receiving circuit and the operating method thereof. The circuit includes a signal receiving unit, a first signal generator and a second signal generator. The signal receiving unit receives a first signal and a second signal. The first signal generator generates the first signal. The second signal generator, which is couple to the signal receiving unit, generates the second signal. There is a phase difference between the first signal and the second signal such that in the signal receiving unit the two signals eliminate each other's power.Type: GrantFiled: October 17, 2006Date of Patent: October 5, 2010Assignee: MStar Semiconductor, Inc.Inventors: ShouFang Chen, Steve Wiyi Yang
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Patent number: 7719027Abstract: The present invention provides an integrated circuit and the method of implementing the same. The integrated circuit includes a die, a base, a covering material and a plurality of pins. The die has at least a first function and a second function and includes a plurality of signal pads and at least a switching pad. The die receives and outputs signals through the signal pads, and the switching pad is utilized to switch the functions of the die. The base is utilized to support the die, and the covering material is utilized to cover the die and the base. One terminal of each pin is inside the covering material and coupled to the corresponding signal pad, and the other terminal of each pin is outside the covering material. The signal pads are connected to the circuits outside the integrate circuit through the pins.Type: GrantFiled: January 22, 2007Date of Patent: May 18, 2010Assignee: MStar Semiconductor, Inc.Inventor: ShouFang Chen
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Publication number: 20090303123Abstract: A hybrid Global Positioning System (GPS) receiving method, and associated GPS receiving apparatus is provided. The GPS receiving apparatus includes an RF front-end circuit, a correlation circuit, an acquisition engine and a bidirectional interface control unit. The RF front-end receiving circuit receives a satellite signal and converts the same into a baseband signal. The acquisition engine, coupled to the correlation circuit, determines reception power of the GPS satellite signal. The interface control unit, coupled to the acquisition engine, provides a low-speed interface for transmitting GPS intermediate data that includes a code bin, a frequency bin, navigation data, a local system time and a GPS time. The interface control unit includes a memory interface unit for coupling to a memory.Type: ApplicationFiled: December 29, 2008Publication date: December 10, 2009Applicant: MStar Semiconductor, Inc.Inventors: Shoufang Chen, Ying-Lin Lai, Jia-Yi Chen, Chao-Tung Yang, Chiung Hung Chang
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Patent number: 7548043Abstract: A power supply apparatus includes a current modulation unit, a voltage converting unit, a current detector, and a control unit. The current modulation unit is used for receiving an input voltage and a control signal, generating an output current and adjusting the value of the output current according to the control signal. The voltage converting unit, coupled to the current modulation unit, converts the output current into the output voltage. The current detector, coupled to the voltage converting unit and the output terminal, detects the current flowing through the load and outputs a current detection result. The control unit, coupled to the current modulation unit, the current detector and the output terminal, receives the current detection result and the output voltage, and generates the control signal according to the current detection result and the output voltage.Type: GrantFiled: November 16, 2006Date of Patent: June 16, 2009Assignee: MStar Semiconductor, Inc.Inventor: ShouFang Chen
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Publication number: 20080295137Abstract: A digital video broadcasting-satellite (DVB-S) multi-input receiving circuit and an associated method are provided to receive satellite input signals provided by a plurality of low noise blocks (LNB), thereby reducing the cost of DVB-S receivers. The DVB-S multi-input receiving circuit includes a selection circuit and a combiner. The selection circuit includes a plurality of signal paths for conveying a plurality of satellite input signals, and enables one of the signal paths to output one of the satellite input signals. The combiner combines the signal paths into a single signal path, which is coupled to a DVB-S tuner.Type: ApplicationFiled: May 21, 2008Publication date: November 27, 2008Inventor: ShouFang CHEN
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Publication number: 20080238628Abstract: A frequency synthesizer for providing clock signals with different frequencies for corresponding band transceivers and associated frequency synthesizing method are provided. The frequency synthesizer includes a phase-locked loop module having a single voltage controlled oscillator, a first frequency divider and a second frequency divider. At first, the single voltage controlled oscillator is activated to generate a primary clock signal. The first frequency divider frequency-divides the primary clock signal to generate a first clock signal for a first band transceiver. The first clock signal is further frequency-divided into a second clock signal for a second band transceiver. Therefore, the frequency synthesizer with the single voltage controlled oscillator can generate clock signals covering more than one frequency band.Type: ApplicationFiled: March 28, 2008Publication date: October 2, 2008Applicant: MSTAR SEMICONDUCTOR, INC.Inventors: CHRISTOPHER TIN SING LAM, SHOUFANG CHEN
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Publication number: 20080238498Abstract: A clock generator includes a delta sigma modulator, a counter and a first phase lock loop. The delta sigma modulator sequentially generates a plurality of variable parameters according to a predetermined value and a first input clock signal. The counter, which is connected to the delta sigma modulator, is used to generate an output clock signal in accordance with a counting value and a second input clock signal. The counting value is relevant to the variable parameters. The first phase lock loop, which is connected to the output of the counter, is used to generate an objective clock signal in accordance with the output clock signal.Type: ApplicationFiled: March 12, 2008Publication date: October 2, 2008Applicant: MSTAR SEMICONDUCTOR, INC.Inventors: Christopher Tin Sing Lam, Fucheng Wang, Shoufang Chen
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Publication number: 20080167815Abstract: A navigating system with RFID function includes a GPS module for receiving a plurality of satellite signals for location, and an RFID reader for receiving an RFID signal. The navigating system performs navigation according to a first position information and the location function of the GPS module if the RFID signal includes the first position information.Type: ApplicationFiled: November 30, 2007Publication date: July 10, 2008Inventors: Chao-Tung Yang, ShouFang Chen
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Publication number: 20080029908Abstract: The present invention provides an integrated circuit and the method of implementing the same. The integrated circuit includes a die, a base, a covering material and a plurality of pins. The die has at least a first function and a second function and includes a plurality of signal pads and at least a switching pad. The die receives and outputs signals through the signal pads, and the switching pad is utilized to switch the functions of the die. The base is utilized to support the die, and the covering material is utilized to cover the die and the base. One terminal of each pin is inside the covering material and coupled to the corresponding signal pad, and the other terminal of each pin is outside the covering material. The signal pads are connected to the circuits outside the integrate circuit through the pins.Type: ApplicationFiled: January 22, 2007Publication date: February 7, 2008Inventor: ShouFang Chen
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Publication number: 20080001584Abstract: The present invention discloses a power supply apparatus and a method for providing a voltage. The power supply apparatus includes a current modulation unit, a voltage converting unit, a current detector, and a control unit. The current modulation unit is used for receiving an input voltage and a control signal, generating an output current and adjusting the value of the output current according to the control signal. The voltage converting unit, coupled to the current modulation unit, converts the output current into the output voltage. The current detector, coupled to the voltage converting unit and the output terminal, detects the current flowing through the load and outputting a current detection result. The control unit, coupled to the current modulation unit, the current detector and the output terminal, receives the current detection result, the output voltage, and generates the control signal according to the current detection result and the output voltage.Type: ApplicationFiled: November 16, 2006Publication date: January 3, 2008Inventor: ShouFang Chen
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Publication number: 20070275673Abstract: The present invention provides a signal emitting and receiving circuit and the operating method thereof. The circuit includes a signal receiving unit, a first signal generator and a second signal generator. The signal receiving unit receives a first signal and a second signal. The first signal generator generates the first signal. The second signal generator, which is couple to the signal receiving unit, generates the second signal. There is a phase difference between the first signal and the second signal such that in the signal receiving unit the two signals eliminate each other's power.Type: ApplicationFiled: October 17, 2006Publication date: November 29, 2007Inventors: ShouFang Chen, Steve Wiyi Yang
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Publication number: 20070218851Abstract: Multistage RF transmitter and receiver circuits may use independently variable RF and IF local oscillators, allowing the RF and IF local oscillator frequencies for a given RF channel to be selected to have a large common factor with respect to the reference oscillator used by the local oscillator circuits, thus allowing the use of small divisor numbers in the local oscillator circuits and reducing phase noise. Independent high-side and low-side RF local oscillators may be provided and selectively used depending on the RF channel to be transmitted or received.Type: ApplicationFiled: May 16, 2007Publication date: September 20, 2007Inventors: Zaw Soe, Tony Yang, Jackie Cheng, Sining Zhou, Kuangyu Li, Fei-Ran Yang, Shoufang Chen, Tom Baker
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Patent number: 7266352Abstract: Multistage RF transmitter and receiver circuits may use independently variable RF and IF local oscillators, allowing the RF and IF local oscillator frequencies for a given RF channel to be selected to have a large common factor with respect to the reference oscillator used by the local oscillator circuits, thus allowing the use of small divisor numbers in the local oscillator circuits and reducing phase noise. Independent high-side and low-side RF local oscillators may be provided and selectively used depending on the RF channel to be transmitted or received.Type: GrantFiled: May 28, 2004Date of Patent: September 4, 2007Assignee: Wionics ResearchInventors: Zaw Min Soe, Tony Yang, Jackie Cheng, Sining Zhou, Kuangyu Li, Fei-Ran Yang, Shoufang Chen, Tom Baker