Patents by Inventor Yao-Ching Liu
Yao-Ching 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).
-
Patent number: 9331710Abstract: A method for an oversampling digital-to-analog converter (DAC) includes oversampling M-bit binary data to provide N-bit oversampled binary data, wherein M and N are integers and N is greater than M, encoding the N-bit oversampled binary data to provide 2(N-1)-bit thermometer code data and a sign bit, shuffling the 2(N-1)-bit thermometer code data to provide 2(N-1)-bit shuffled data, converting the 2(N-1)-bit shuffled data and the sign bit to an analog output signal, and smoothing the analog signal to provide a smoothed analog output signal.Type: GrantFiled: June 26, 2015Date of Patent: May 3, 2016Assignee: NUVOTON TECHNOLOGY CORPORATIONInventors: Peter Holzmann, Yao-Ching Liu
-
Patent number: 8917143Abstract: An integrated circuit (IC) chip has a class D PWM (pulse width modulation) amplifier configured for generating first and second PWM signals. The class-D PWM modulator includes a differential output driver configured for driving a first and a second output signals in response to the first and the second PWM signals. A clipping detection circuit is configured to turn on a clipping indication signal when one or both of the first PWM signal and the second PWM signal maintain the same state between two consecutive edges of the oscillator clock signal. The clipping detection circuit is also configured to turn off the clipping indication signal when both the first PWM signal and the second PWM signal change states between two consecutive edges of the oscillator clock signal.Type: GrantFiled: November 8, 2012Date of Patent: December 23, 2014Assignee: Nuvoton Technology CorporationInventors: Peter J Holzmann, Zhiqiang Pan, Yao-Ching Liu
-
Publication number: 20140125411Abstract: An integrated circuit (IC) chip has a class D PWM (pulse width modulation) amplifier configured for generating first and second PWM signals. The class-D PWM modulator includes a differential output driver configured for driving a first and a second output signals in response to the first and the second PWM signals. A clipping detection circuit is configured to turn on a clipping indication signal when one or both of the first PWM signal and the second PWM signal maintain the same state between two consecutive edges of the oscillator clock signal. The clipping detection circuit is also configured to turn off the clipping indication signal when both the first PWM signal and the second PWM signal change states between two consecutive edges of the oscillator clock signal.Type: ApplicationFiled: November 8, 2012Publication date: May 8, 2014Applicant: Nuvoton Technology CorporationInventors: PETER J. HOLZMANN, Zhiqiang PAN, Yao-Ching LIU
-
Patent number: 8411574Abstract: A shared memory packet switching device includes: a shared memory providing a shared memory space; an input logic unit associated with at least one receive port, and being operative to determine whether the associated receive port is saturated by determining whether a number of packets received via the associated receive port and currently stored in the shared memory exceeds a drop threshold value; a packet routing control unit operative to determine a destination one of the transmit ports for each of the received data packets; and an output logic unit associated with at least one of the transmit ports, the output logic unit being communicatively coupled with the packet routing control unit, and being operative to determine whether the associated transmit port is congested by determining whether a number of packets currently stored in the shared memory that are to be transmitted via the associated transit port exceeds a congestion threshold value, and also being operative to generate an associated output fullType: GrantFiled: August 30, 2006Date of Patent: April 2, 2013Assignee: Broadcom CorporationInventors: Yao-Ching Liu, William Dai, Jason Chao
-
Publication number: 20090182185Abstract: The present invention provides a method and apparatus for removing acetylene from a gasoeus mixture comprising hydrogen, methane, ethane, ethylene, acetylene, propane, propylene, butane, butenes, butadiene, and other C4 or higher hydrocarbons. The method of the invention utilizes a front-end acetylene removal unit (“ARU”) located after a charge gas compressor in which acetylene is selectively reduced. The method of the invention achieves selective reduction of acetylene by using a proprietary Chevron Phillips E series palladium based catalyst. The method of the invention also utilizes a novel startup procedure, a novel emergency shutdown procedure, a novel maximum cool down procedure, and a novel carbon monoxide monitoring procedure.Type: ApplicationFiled: March 27, 2009Publication date: July 16, 2009Applicant: Eastman Chemical CompanyInventors: James Michael Jordan, Kevin Hunter McGuire, Daryl Bitting, Randall Lloyd Lamirand, James Joseph Cerrato, Ronnie Paul Pertuit, George Michael McLeod, Yao-Ching Liu
-
Patent number: 7352765Abstract: A packet switching fabric includes means forming a data ring, means forming a control ring, and means forming a plurality of data communication network links each having at least one network node coupled thereto. The fabric further includes a plurality of output queuing controlled switching devices coupled together by the data ring means and the control ring means so that the network links can be selectively communicatively coupled. Each of the output queuing controlled switching devices includes control ring processing means operative to develop, transmit and receive control messages to and from adjacent ones of the devices via the control ring means.Type: GrantFiled: October 29, 2003Date of Patent: April 1, 2008Assignee: Broadcom CorporationInventors: William Dai, Jason Chao, Yao-Ching Liu
-
Publication number: 20060291458Abstract: A shared memory packet switching device includes: a shared memory providing a shared memory space; an input logic unit associated with at least one receive port, and being operative to determine whether the associated receive port is saturated by determining whether a number of packets received via the associated receive port and currently stored in the shared memory exceeds a drop threshold value; a packet routing control unit operative to determine a destination one of the transmit ports for each of the received data packets; and an output logic unit associated with at least one of the transmit ports, the output logic unit being communicatively coupled with the packet routing control unit, and being operative to determine whether the associated transmit port is congested by determining whether a number of packets currently stored in the shared memory that are to be transmitted via the associated transit port exceeds a congestion threshold value, and also being operative to generate an associated output fullType: ApplicationFiled: August 30, 2006Publication date: December 28, 2006Inventors: Yao-Ching Liu, William Dai, Jason Chao
-
Patent number: 7120117Abstract: A shared memory packet switching device includes: a shared memory providing a shared memory space; an input logic unit associated with at least one receive port, and being operative to determine whether the associated receive port is saturated by determining whether a number of packets received via the associated receive port and currently stored in the shared memory exceeds a drop threshold value; a packet routing control unit operative to determine a destination one of the transmit ports for each of the received data packets; and an output logic unit associated with at least one of the transmit ports, the output logic unit being communicatively coupled with the packet routing control unit, and being operative to determine whether the associated transmit port is congested by determining whether a number of packets currently stored in the shared memory that are to be transmitted via the associated transit port exceeds a congestion threshold value, and also being operative to generate an associated output fullType: GrantFiled: August 29, 2000Date of Patent: October 10, 2006Assignee: Broadcom CorporationInventors: Yao-Ching Liu, William Dai, Jason Chao
-
Publication number: 20040100954Abstract: A packet switching fabric includes means forming a data ring, means forming a control ring, and means forming a plurality of data communication network links each having at least one network node coupled thereto. The fabric further includes a plurality of output queuing controlled switching devices coupled together by the data ring means and the control ring means so that the network links can be selectively communicatively coupled. Each of the output queuing controlled switching devices includes control ring processing means operative to develop, transmit and receive control messages to and from adjacent ones of the devices via the control ring means.Type: ApplicationFiled: October 29, 2003Publication date: May 27, 2004Applicant: Broadcom CorporationInventors: William Dai, Jason Chao, Yao-Ching Liu
-
Patent number: 6658016Abstract: A packet switching fabric includes means forming a data ring, means forming a control ring, and means forming a plurality of data communication network links each having at least one network node coupled thereto. The fabric further includes a plurality of output queuing controlled switching devices coupled together by the data ring means and the control ring means so that the network links can be selectively communicatively coupled. Each of the output queuing controlled switching devices includes control ring processing means operative to develop, transmit and receive control messages to and from adjacent ones of the devices via the control ring means.Type: GrantFiled: February 29, 2000Date of Patent: December 2, 2003Assignee: Broadcom CorporationInventors: William Dai, Jason Chao, Yao-Ching Liu
-
Patent number: 6570403Abstract: A queue length arbiter system provides for selecting from a plurality of N queues requiring access to a resource. The system includes: an arbitration circuit; and a plurality of weight circuits each being associated with a corresponding one of the queues, and being operative to store a corresponding weight count value, and also being operative to initialize the corresponding weight count value to a corresponding initial weight value determined based on a length value indicative of a number of data portions enqueued at the corresponding queue at an initial time, and being further operative to decrease the corresponding weight count value in response to a corresponding one of a plurality of grant signals, and also being operative to generate a corresponding one of a plurality of weight count signals, the corresponding weight count signal carrying the corresponding weight count value.Type: GrantFiled: June 3, 2002Date of Patent: May 27, 2003Assignee: Broadcom CorporationInventors: Yao-Ching Liu, William Dai, Jason Chao, Jun Cao
-
Publication number: 20020178311Abstract: A queue length arbiter system provides for selecting from a plurality of N queues requiring access to a resource. The system includes: an arbitration circuit; and a plurality of weight circuits each being associated with a corresponding one of the queues, and being operative to store a corresponding weight count value, and also being operative to initialize the corresponding weight count value to a corresponding initial weight value determined based on a length value indicative of a number of data portions enqueued at the corresponding queue at an initial time, and being further operative to decrease the corresponding weight count value in response to a corresponding one of a plurality of grant signals, and also being operative to generate a corresponding one of a plurality of weight count signals, the corresponding weight count signal carrying the corresponding weight count value.Type: ApplicationFiled: June 3, 2002Publication date: November 28, 2002Applicant: Broadcom CorporationInventors: Yao-Ching Liu, William Dai, Jason Chao, Jun Cao
-
Patent number: 6451926Abstract: EpB polyether alcohols were prepared by reacting 3,4-epoxy-1-butene with water or an alcohol such as methanol, butanol or ethylene glycol. Polyether alcohols thus prepared were found to have utility as reactive diluents for oxidatively curable coatings. In addition to this application, 3,4-epoxy-1-butene oligomers can also function as a resin, a chain extender, a monomer, and an additive for various oxidatively curable coating systems including alkyds, unsaturated polyesters, (meth)acrylate functional resins, urethanes, and latexes.Type: GrantFiled: May 4, 2000Date of Patent: September 17, 2002Assignee: Eastman Chemical CompanyInventors: Thauming Kuo, Edward Enns McEntire, Stephen Neal Falling, Yao-Ching Liu, William Anthony Slegeir
-
Patent number: 6420901Abstract: A queue length arbiter system provides for selecting from a plurality of N queues requiring access to a resource. The system includes: an arbitration circuit; and a plurality of weight circuits each being associated with a corresponding one of the queues, and being operative to store a corresponding weight count value, and also being operative to initialize the corresponding weight count value to a corresponding initial weight value determined based on a length value indicative of a number of data portions enqueued at the corresponding queue at an initial time, and being further operative to decrease the corresponding weight count value in response to a corresponding one of a plurality of grant signals, and also being operative to generate a corresponding one of a plurality of weight count signals, the corresponding weight count signal carrying the corresponding weight count value.Type: GrantFiled: April 5, 2001Date of Patent: July 16, 2002Assignee: Broadcom CorporationInventors: Yao-Ching Liu, William Dai, Jason Chao, Jun Cao
-
Patent number: 6335455Abstract: This invention pertains to a process for the preparation of 2,5-dihydrofurans by the isomerization of &ggr;,&dgr;-epoxyalkenes in the presence of a catalyst system comprising an organotin compound and an alkali metal iodide.Type: GrantFiled: August 28, 1998Date of Patent: January 1, 2002Assignee: Eastman Chemical CompanyInventors: Shaowo Liang, Yao-Ching Liu
-
Publication number: 20010047446Abstract: A queue length arbiter system provides for selecting from a plurality of N queues requiring access to a resource. The system includes: an arbitration circuit; and a plurality of weight circuits each being associated with a corresponding one of the queues, and being operative to store a corresponding weight count value, and also being operative to initialize the corresponding weight count value to a corresponding initial weight value determined based on a length value indicative of a number of data portions enqueued at the corresponding queue at an initial time, and being further operative to decrease the corresponding weight count value in response to a corresponding one of a plurality of grant signals, and also being operative to generate a corresponding one of a plurality of weight count signals, the corresponding weight count signal carrying the corresponding weight count value.Type: ApplicationFiled: April 5, 2001Publication date: November 29, 2001Applicant: Allayer CommunicationsInventors: Yao-Ching Liu, William Dai, Jason Chao, Jun Cao
-
Patent number: 6246256Abstract: A queue length arbiter system provides for selecting from a plurality of N queues requiring access to a resource. The system includes: an arbitration circuit; and a plurality of weight circuits each being associated with a corresponding one of the queues, and being operative to store a corresponding weight count value, and also being operative to initialize the corresponding weight count value to a corresponding initial weight value determined based on a length value indicative of a number of data portions enqueued at the corresponding queue at an initial time, and being further operative to decrease the corresponding weight count value in response to a corresponding one of a plurality of grant signals, and also being operative to generate a corresponding one of a plurality of weight count signals, the corresponding weight count signal carrying the corresponding weight count value.Type: GrantFiled: November 29, 1999Date of Patent: June 12, 2001Assignee: Broadcom CorporationInventors: Yao-Ching Liu, William Dai, Jason Chao, Jun Cao
-
Patent number: 5510180Abstract: A multi-layer laminate containing a layer of a polypropylene material permanently bonded to an imine primed substrate is disclosed. This laminate contains a layer that is a blend of maleated high molecular weight polypropylene/low density polyethylene and a second layer that is substrate, such as nylon, that is primed with an imine primer such as polyethyleneimine.Type: GrantFiled: September 23, 1993Date of Patent: April 23, 1996Assignee: Eastman Chemical CompanyInventors: Yao-Ching Liu, Ray Edwards
-
Patent number: 5414063Abstract: A process control scheme for temporarily slowing or killing the production of polypropylene while idling the reactor using a fourth generation catalyst system containing a solid magnesium chloride supported titanium tetrachloride catalyst component containing an internal strong electron donor in combination with a silicon compound, and an organoaluminum compound (cocatalyst) is disclosed. This process entails the introduction of an amount of an external strong electron donor to the ongoing polymerization reaction. The polymerization reaction can be restarted by introducing an additional amount of the organoaluminum compound.Type: GrantFiled: March 30, 1993Date of Patent: May 9, 1995Assignee: Huntsman Polypropylene CorporationInventors: Horst K. Seeger, Yao-Ching Liu, LeVoy G. Haight, Luis A. Pagan, Kimberly R. Payne, Jeffrey J. Vanderbilt
-
Patent number: 5248364Abstract: A multi layer laminate containing a layer of a polypropylene material permanently bonded to an imine primed substrate is disclosed. This laminate contains a layer that is a blend of maleated high molecular weight polypropylene/low density polyethylene and a second layer that is substrate, such as nylon, that is primed with an imine primer such as polyethyleneimine.Type: GrantFiled: December 30, 1991Date of Patent: September 28, 1993Assignee: Eastman Kodak CompanyInventors: Yao-Ching Liu, Ray Edwards