Patents by Inventor Su-liang Liao
Su-liang Liao 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: 9407234Abstract: The present invention discloses a current balancing device and method capable of balancing an output current and an input current of a current loop. Said device comprises: a transmission circuit for outputting an output current and receiving an input current; at least one adjustable resistor set in the current loop for providing resistance according to at least one adjustment signal; and a current balancing circuit, coupled to the transmission circuit and the adjustable resistor, for determining whether the difference between the output and input currents satisfies a predetermined requirement in light of a predetermined duration and thereby generating the adjustment signal, wherein if the difference between the output and input currents fails to satisfy the predetermined requirement, the current balancing circuit will adjust the resistance of the adjustable resistor through the adjustment signal, so as to reduce the difference between the output and input currents.Type: GrantFiled: October 15, 2014Date of Patent: August 2, 2016Assignee: REALTEK SEMICONDUCTOR CORPORATIONInventors: Shih-Wei Wang, Su-Liang Liao, Liang-Wei Huang, Sheng-Fu Chuang
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Patent number: 9157947Abstract: A communication apparatus and an associated estimation method are provided. The communication apparatus is electrically connected to a loading terminal and operates at a common bias voltage. The communication apparatus includes a transmitter, a connector, and a receiver. The connector includes a bridging circuit and a measurement circuit. The bridging circuit has a positive measurement end and a negative measurement end. The transmitter transmits an analog output signal. The receiver receives a common bias voltage during an estimation process. During the estimation process, the measurement circuit estimates a positive loading resistance and a negative loading resistance corresponding to the loading terminal according to a voltage difference between the common bias voltage and voltage at one of the positive measurement end and the negative measurement end.Type: GrantFiled: October 30, 2013Date of Patent: October 13, 2015Assignee: REALTEK SEMICONDUCTOR CORP.Inventors: Sheng-Fu Chuang, Su-Liang Liao, Liang-Wei Huang, Hsuan-Ting Ho
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Publication number: 20150130439Abstract: The present invention discloses a current balancing device and method capable of balancing an output current and an input current of a current loop. Said device comprises: a transmission circuit for outputting an output current and receiving an input current; at least one adjustable resistor set in the current loop for providing resistance according to at least one adjustment signal; and a current balancing circuit, coupled to the transmission circuit and the adjustable resistor, for determining whether the difference between the output and input currents satisfies a predetermined requirement in light of a predetermined duration and thereby generating the adjustment signal, wherein if the difference between the output and input currents fails to satisfy the predetermined requirement, the current balancing circuit will adjust the resistance of the adjustable resistor through the adjustment signal, so as to reduce the difference between the output and input currents.Type: ApplicationFiled: October 15, 2014Publication date: May 14, 2015Inventors: Shih-Wei Wang, Su-Liang Liao, Liang-Wei Huang, Sheng-Fu Chuang
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Patent number: 9000618Abstract: A transmission line driver and a method for driving the same are provided, in which a composite current source is provided as an input current source, such that an output voltage is fixed. The composite current source includes an internal current source and an external current source. The composite current source is supplied to a single-ended transmission line driver or a differential transmission line driver, such that the output voltage is fixed.Type: GrantFiled: September 10, 2010Date of Patent: April 7, 2015Assignee: Realtek Semiconductor Corp.Inventor: Su-liang Liao
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Publication number: 20140118006Abstract: A communication apparatus and an associated estimation method are provided. The communication apparatus is electrically connected to a loading terminal and operates at a common bias voltage. The communication apparatus includes a transmitter, a connector, and a receiver. The connector includes a bridging circuit and a measurement circuit. The bridging circuit has a positive measurement end and a negative measurement end. The transmitter transmits an analog output signal. The receiver receives a common bias voltage during an estimation process. During the estimation process, the measurement circuit estimates a positive loading resistance and a negative loading resistance corresponding to the loading terminal according to a voltage difference between the common bias voltage and voltage at one of the positive measurement end and the negative measurement end.Type: ApplicationFiled: October 30, 2013Publication date: May 1, 2014Applicant: REALTEK SEMICONDUCTOR CORP.Inventors: Sheng-Fu Chuang, Su-Liang Liao, Liang-Wei Huang, Hsuan-Ting Ho
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Patent number: 8415971Abstract: A transceiving circuit resistance calibrating method, which is applied to a transceiving circuit. The method includes: inputting a first current to a transmitter to generate a first output voltage, wherein the first current is generated according to a ratio between a predetermined voltage and an inner resistor of a chip; inputting a second current to a transmitter to generate a second output voltage, wherein the first current is generated according to a ratio between the predetermined voltage and a predetermined resistor; and adjusting a first adjustable resistance module according to a difference between the first output voltage and the second output voltage.Type: GrantFiled: February 15, 2012Date of Patent: April 9, 2013Assignee: Realtek Semiconductor Corp.Inventors: Chien-Ming Wu, Su-Liang Liao
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Publication number: 20120223736Abstract: A transceiving circuit resistance calibrating method, which is applied to a transceiving circuit. The method includes: inputting a first current to a transmitter to generate a first output voltage, wherein the first current is generated according to a ratio between a predetermined voltage and an inner resistor of a chip; inputting a second current to a transmitter to generate a second output voltage, wherein the first current is generated according to a ratio between the predetermined voltage and a predetermined resistor; and adjusting a first adjustable resistance module according to a difference between the first output voltage and the second output voltage.Type: ApplicationFiled: February 15, 2012Publication date: September 6, 2012Inventors: Chien-Ming Wu, Su-Liang Liao
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Patent number: 8093911Abstract: Systems and methods are described for transmitting a waveform having a controllable attenuation and propagation velocity. An exemplary method comprises: generating an exponential waveform, the exponential waveform (a) being characterized by the equation Vin=De?ASD[x?vSDt], where D is a magnitude, Vin is a voltage, t is time, ASD is an attenuation coefficient, and vSD is a propagation velocity; and (b) being truncated at a maximum value. An exemplary apparatus comprises: an exponential waveform generator; an input recorder coupled to an output of the exponential waveform generator; a transmission line under test coupled to the output of the exponential waveform generator; an output recorder coupled to the transmission line under test; an additional transmission line coupled to the transmission line under test; and a termination impedance coupled to the additional transmission line and to a ground.Type: GrantFiled: October 26, 2010Date of Patent: January 10, 2012Assignee: Board of Regents, The University of TexasInventors: Robert H. Flake, John F. Biskup, Su-liang Liao
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Patent number: 8093944Abstract: A line driver includes an output terminal set for outputting an output signal, a differential amplifier for amplifying an input signal, a series resistor set coupled between the differential amplifier and the output terminal set, a negative-feedback resistor set coupled to the differential amplifier, a feedback variable resistor set coupled between the differential amplifier and the output terminal set, and an adjusting unit coupled to the feedback variable resistor set. The adjusting unit is operable to adjust resistances of the feedback variable resistor set according to the output signal.Type: GrantFiled: November 11, 2009Date of Patent: January 10, 2012Assignee: Realtek Semiconductor Corp.Inventor: Su-Liang Liao
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Publication number: 20110062781Abstract: A transmission line driver and a method for driving the same are provided, in which a composite current source is provided as an input current source, such that an output voltage is fixed. The composite current source includes an internal current source and an external current source. The composite current source is supplied to a single-ended transmission line driver or a differential transmission line driver, such that the output voltage is fixed.Type: ApplicationFiled: September 10, 2010Publication date: March 17, 2011Inventor: Su-liang LIAO
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Publication number: 20110035170Abstract: Systems and methods are described for transmitting a waveform having a controllable attenuation and propagation velocity. An exemplary method comprises: generating an exponential waveform, the exponential waveform (a) being characterized by the equation Vin=De?ASD[x?vSDt], where D is a magnitude, Vin is a voltage, t is time, ASD is an attenuation coefficient, and vSD is a propagation velocity; and (b) being truncated at a maximum value. An exemplary apparatus comprises: an exponential waveform generator; an input recorder coupled to an output of the exponential waveform generator; a transmission line under test coupled to the output of the exponential waveform generator; an output recorder coupled to the transmission line under test; an additional transmission line coupled to the transmission line under test; and a termination impedance coupled to the additional transmission line and to a ground.Type: ApplicationFiled: October 26, 2010Publication date: February 10, 2011Inventors: Robert H. Flake, John F. Biskup, Su-Liang Liao
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Publication number: 20100117736Abstract: A line driver includes an output terminal set for outputting an output signal, a differential amplifier for amplifying an input signal, a series resistor set coupled between the differential amplifier and the output terminal set, a negative-feedback resistor set coupled to the differential amplifier, a feedback variable resistor set coupled between the differential amplifier and the output terminal set, and an adjusting unit coupled to the feedback variable resistor set. The adjusting unit is operable to adjust resistances of the feedback variable resistor set according to the output signal.Type: ApplicationFiled: November 11, 2009Publication date: May 13, 2010Applicant: Realtek Semiconductor Corp.Inventor: Su-Liang LIAO
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Patent number: 7701284Abstract: A line driver includes: a differential amplifier for amplifying an input signal to generate an output signal; first and second series resistors coupled respectively to output terminals of the differential amplifier and through which the output signal is output; first and second negative-feedback resistors each coupled between a respective input terminal and a respective output terminal of the differential amplifier; first and second positive-feedback variable resistors each coupled between a respective input terminal of the differential amplifier and a respective one of the first and second series resistors; and an adjusting unit coupled to the first and second positive-feedback variable resistors to adjust a resistance thereof with reference to the output signal.Type: GrantFiled: July 3, 2008Date of Patent: April 20, 2010Assignee: Realtek Semiconductor Corp.Inventors: Su-Liang Liao, Ming-Cheng Chiang
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Publication number: 20090009242Abstract: A line driver includes: a differential amplifier for amplifying an input signal to generate an output signal; first and second series resistors coupled respectively to output terminals of the differential amplifier and through which the output signal is output; first and second negative-feedback resistors each coupled between a respective input terminal and a respective output terminal of the differential amplifier; first and second positive-feedback variable resistors each coupled between a respective input terminal of the differential amplifier and a respective one of the first and second series resistors; and an adjusting unit coupled to the first and second positive-feedback variable resistors to adjust a resistance thereof with reference to the output signal.Type: ApplicationFiled: July 3, 2008Publication date: January 8, 2009Inventors: Su-Liang LIAO, Ming-Cheng Chiang
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Publication number: 20080317166Abstract: Systems and methods are described for transmitting a waveform having a controllable attenuation and propagation velocity. An exemplary method comprises: generating an exponential waveform, the exponential waveform (a) being characterized by the equation Vin=De?ASD[x?vSDt], where D is a magnitude, Vin is a voltage, t is time, ASD is an attenuation coefficient, and vSD is a propagation velocity; and (b) being truncated at a maximum value. An exemplary apparatus comprises: an exponential waveform generator; an input recorder coupled to an output of the exponential waveform generator; a transmission line under test coupled to the output of the exponential waveform generator; an output recorder coupled to the transmission line under test; an additional transmission line coupled to the transmission line under test; and a termination impedance coupled to the additional transmission line and to a ground.Type: ApplicationFiled: March 26, 2008Publication date: December 25, 2008Inventors: Robert H. Flake, John F. Biskup, Su-liang Liao
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Patent number: 7375602Abstract: Systems and methods are described for transmitting a waveform having a controllable attenuation and propagation velocity. An exemplary method comprises: generating an exponential waveform, the exponential waveform (a) being characterized by the equation Vin=De?ASD[x?vSDt], where D is a magnitude, Vin is a voltage, t is time, ASD is an attenuation coefficient, and vSD is a propagation velocity; and (b) being truncated at a maximum value. An exemplary apparatus comprises: an exponential waveform generator; an input recorder coupled to an output of the exponential waveform generator; a transmission line under test coupled to the output of the exponential waveform generator; an output recorder coupled to the transmission line under test; an additional transmission line coupled to the transmission line under test; and a termination impedance coupled to the additional transmission line and to a ground.Type: GrantFiled: December 10, 2004Date of Patent: May 20, 2008Assignee: Board of Regents, The University of Texas SystemInventors: Robert H. Flake, John F. Biskup, Su-liang Liao