Patents by Inventor Zhao Wang

Zhao Wang 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: 7746047
    Abstract: Techniques pertaining to designs of a compensation voltage controlled current source (VCCS) used in low dropout voltage regulators are disclosed. According to one aspect of the present invention, a compensation voltage controlled current source (VCCS) is so designed to meet the low input/output voltage requirements. Various features of the VCCS are demonstrated through several embodiments.
    Type: Grant
    Filed: January 23, 2008
    Date of Patent: June 29, 2010
    Assignee: Vimicro Corporation
    Inventors: Hang Yin, Zhao Wang
  • Patent number: 7710049
    Abstract: Techniques pertaining to driving LEDs on multiple branches of a circuit are disclosed. According to one aspect of the present invention, an LED drive circuit includes a boost circuit configured for receiving an input voltage and providing an output voltage according to a control signal, a selector configured for alternatively selecting one of the feedback signals as an output feedback signal and switching on a corresponding branch circuit, and a pulse-width modulation (PWM) controller configured for generating a pulse-width modulation signal as the control signal for the boost circuit according to the output feedback signal of the selector, essentially to match respective currents in the multiple branches.
    Type: Grant
    Filed: May 19, 2008
    Date of Patent: May 4, 2010
    Assignee: Vimicro Corporation
    Inventors: Zhao Wang, Hang Yin, Wenbo Tian
  • Publication number: 20090326020
    Abstract: Compounds according to formula (I) are disclosed where Q is S, N, or O; X is optional, and can be O?, S?, ?N—NH2, ?N—OH, or —OH; Y is optional and can be —N(H)—, O, or C1 to C20 hydrocarbon; and R1 and R2 are each independently substituted or unsubstituted single-, fused- or multiple-ring aryl or (hetero)cyclic ring systems. Methods of making these compounds, pharmaceutical compositions containing the compounds, and their use, particularly for treating or preventing cancer, are also disclosed.
    Type: Application
    Filed: June 16, 2009
    Publication date: December 31, 2009
    Applicants: UNIVERSITY OF TENNESSEE RESEARCH FOUNDATION, OHIO STATE UNIVERSITY RESEARCH FOUNDATION
    Inventors: Duane D. Miller, Wei Li, Zhao Wang, Yan Lu, Jianjun Chen, James T. Dalton, Chien-Ming Li
  • Patent number: 7583068
    Abstract: A multifunctional driver controller capable to drive one or more voltage-controlled devices or current-controlled devices is described. The multifunctional driver controller comprises a selection unit receiving a control signal, one of a first reference voltage and a second reference voltage, the selection unit selecting either one of the first reference voltage and the second reference voltage per the control signal, and a control circuit receiving a reference voltage from the selection unit and a feedback signal from a load being driven by a controlled analog signal from the control circuits. The controlled analog signal is either a controlled voltage signal or a controlled current signal, the control circuit compares the reference voltage with the feedback signal and adjusts the controlled analog signal in reference to a difference between the reference voltage and the feedback signal until the feedback signal converges to the reference voltage.
    Type: Grant
    Filed: August 10, 2007
    Date of Patent: September 1, 2009
    Assignee: Vimicro Corporation
    Inventor: Zhao Wang
  • Publication number: 20090167197
    Abstract: Techniques pertaining to driving LEDs on multiple branches of a circuit are disclosed. According to one aspect of the present invention, an LED drive circuit includes a boost circuit configured for receiving an input voltage and providing an output voltage according to a control signal, a selector configured for alternatively selecting one of the feedback signals as an output feedback signal and switching on a corresponding branch circuit, and a pulse-width modulation (PWM) controller configured for generating a pulse-width modulation signal as the control signal for the boost circuit according to the output feedback signal of the selector, essentially to match respective currents in the multiple branches.
    Type: Application
    Filed: May 19, 2008
    Publication date: July 2, 2009
    Inventors: Zhao WANG, Hang Yin, Wenbo Tian
  • Publication number: 20090167263
    Abstract: Techniques pertaining to a voltage regulator with a current limiting circuit having low quiescent current are disclosed.
    Type: Application
    Filed: December 23, 2008
    Publication date: July 2, 2009
    Inventors: Zhao Wang, Hang Yin, Wenbo Tian
  • Publication number: 20090164532
    Abstract: The invention relates generally to archiving data items in an information store. More particularly, the invention provides a computerized method for identifying, in a first information store, a first data item satisfying retention criteria; copying the first data item to a second information store; creating, in the first information store, a second data item containing a subject of the data of the first data item selected based on the data type of the first data item; and replacing the first data item, in the first information store, with the second data item.
    Type: Application
    Filed: October 16, 2008
    Publication date: June 25, 2009
    Inventors: Anand Prahlad, Andreas May, Zhao Wang, Randy Demeno, Tinku Iyer
  • Publication number: 20090128107
    Abstract: Improved designs of an LDO voltage regulator with ultra low quiescent current are disclosed. According to one embodiment, an LDO voltage regulator is designed to completely cancel an intermediate gain stage while decreasing a quiescent current and to stabilize a loop circuit by means of two zeros introduced in a frequency transfer function thereof. Such a LDO voltage regulator does not increase the power consumption and applicable in many circuits used in electronic devices.
    Type: Application
    Filed: May 19, 2008
    Publication date: May 21, 2009
    Inventors: Zhao WANG, Hang YIN, Wenbo TIAN
  • Patent number: 7482859
    Abstract: Techniques pertaining to a circuit architecture capable of controlling a current source to a predefined precision are disclosed. According to one aspect of the present invention, an automatic trimming circuit is proposed to automatically trim a current generated from a current generator or circuit in accordance with a reference current. The automatic trimming circuit includes a comparator, an ADC and a register. The comparator that may be implemented as a subtractor finds a difference between a generated current and a reference current. The difference is then digitized to an n-bit precision. A digital representation of the difference is then kept in a register and used subsequently correct or modify the generated current to produce a precisely controlled current.
    Type: Grant
    Filed: July 9, 2007
    Date of Patent: January 27, 2009
    Assignee: Vimicro Corporation
    Inventors: Zhao Wang, Qing Yu, David Xiao Dong Yang
  • Patent number: 7472142
    Abstract: The invention relates generally to archiving data items in an information store. More particularly, the invention provides a computerized method for identifying, in a first information store, a first data item satisfying retention criteria; copying the first data item to a second information store; creating, in the first information store, a second data item containing a subset of the data of the first data item selected based on the data type of the first data item; and replacing the first data item, in the first information store, with the second data item.
    Type: Grant
    Filed: July 31, 2006
    Date of Patent: December 30, 2008
    Assignee: CommVault Systems, Inc.
    Inventors: Anand Prahlad, Andreas May, Zhao Wang, Randy Demeno, Tinku Iyer
  • Publication number: 20080284395
    Abstract: Techniques pertaining designs of LDO voltage regulators are described.
    Type: Application
    Filed: March 7, 2008
    Publication date: November 20, 2008
    Inventors: Zhao WANG, Hang YIN, WenBo TIAN
  • Publication number: 20080284394
    Abstract: Techniques pertaining to designs of a compensation voltage controlled current source (VCCS) used in low dropout voltage regulators are disclosed. According to one aspect of the present invention, a compensation voltage controlled current source (VCCS) is so designed to meet the low input/output voltage requirements. Various features of the VCCS are demonstrated through several embodiments.
    Type: Application
    Filed: January 23, 2008
    Publication date: November 20, 2008
    Inventors: Hang YIN, Zhao Wang
  • Publication number: 20080278872
    Abstract: Techniques pertaining to designs of ElectroStatic Discharge (ESD) protection circuits are disclosed. In one embodiment, an ESD protection circuit combines a substrate-driving technique with a gate-driving technique to ease the ESD design and save the silicon area. In another embodiment, an ESD protection circuit is based on a Positive Metal Oxide Semiconductor field effect transistor (PMOS) in a standard Complementary Metal Oxide Semiconductor (CMOS) process. In another embodiment, the ESD protection circuit is based on a negative Metal Oxide Semiconductor field effect transistor (NMOS) in the standard CMOS process. Depending on implementation, the ESD protection circuit is implemented for a negative voltage input pin, a normal input pin, and a power supply clamp circuit.
    Type: Application
    Filed: January 21, 2008
    Publication date: November 13, 2008
    Inventors: Zhao Wang, Hang Yin
  • Publication number: 20080048766
    Abstract: Techniques pertaining to a circuit architecture capable of controlling a current source to a predefined precision are disclosed. According to one aspect of the present invention, an automatic trimming circuit is proposed to automatically trim a current generated from a current generator or circuit in accordance with a reference current. The automatic trimming circuit includes a comparator, an ADC and a register. The comparator that may be implemented as a subtractor finds a difference between a generated current and a reference current. The difference is then digitized to an n-bit precision. A digital representation of the difference is then kept in a register and used subsequently correct or modify the generated current to produce a precisely controlled current.
    Type: Application
    Filed: July 9, 2007
    Publication date: February 28, 2008
    Inventors: Zhao Wang, Qing Yu, David Xiao Dong Yang
  • Publication number: 20080042628
    Abstract: The present invention discloses a multifunctional driver controller capable to drive one or more voltage-controlled devices or current-controlled devices. According to one embodiment, the multifunctional driver controller comprises a selection unit receiving a control signal, one of a first reference voltage and a second reference voltage, the selection unit selecting either one of the first reference voltage and the second reference voltage per the control signal, and a control circuit receiving a reference voltage from the selection unit and a feedback signal from a load being driven by a controlled analog signal from the control circuit, wherein the controlled analog signal is either a controlled voltage signal or a controlled current signal, the control circuit compares the reference voltage with the feedback signal and adjusts the controlled analog signal in reference to a difference between the reference voltage and the feedback signal until the feedback signal converges to the reference voltage.
    Type: Application
    Filed: August 10, 2007
    Publication date: February 21, 2008
    Inventor: Zhao Wang
  • Publication number: 20080043008
    Abstract: The present invention discloses a multifunctional driver controller capable to drive one or more voltage-controlled devices or current-controlled devices. According to one embodiment, the multifunctional driver controller comprises a selection unit receiving a control signal, one of a first reference voltage and a second reference voltage, the selection unit selecting either one of the first reference voltage and the second reference voltage per the control signal, and a control circuit receiving a reference voltage from the selection unit and a feedback signal from a load being driven by a controlled analog signal from the control circuit, wherein the controlled analog signal is either a controlled voltage signal or a controlled current signal, the control circuit compares the reference voltage with the feedback signal and adjusts the controlled analog signal in reference to a difference between the reference voltage and the feedback signal until the feedback signal converges to the reference voltage.
    Type: Application
    Filed: August 10, 2007
    Publication date: February 21, 2008
    Inventor: Zhao Wang
  • Publication number: 20070258895
    Abstract: The present invention provides isolated polypeptides having an amino acid sequence having at least 70% identity to SEQ ID N0:20, wherein the polypeptide has ER-?36 activity. The invention further provides methods for identifying agents that bind to such polypeptides, methods for detecting such polypeptides, and methods for altering the activity of such polypeptides. Also provided are antibodies that specifically bind to an amino acid sequence depicted at SEQ ID NO:1, or an immunogenic fragment thereof, and methods for making and using such antibodies.
    Type: Application
    Filed: March 10, 2005
    Publication date: November 8, 2007
    Inventor: Zhao Wang
  • Patent number: 7233117
    Abstract: The present invention is an inverter controller with feed-forward compensation. The inverter controller includes an error amplifier, a high frequency oscillator (HFOSC) with feed-forward compensation, a comparator, and a driver. The error amplifier can output a signal independent on the variation of a supply voltage. The HFOSC can generate a saw-tooth signal with a constant frequency and an amplitude proportional to the supply voltage. The comparator can compare the signal with the saw-tooth signal and generate a pulse width modulation signal whose duty cycle varies with the variation of the supply voltage. The driver receives the PWM signal and provides a proper pulse width modulation signal to drive an external inverter.
    Type: Grant
    Filed: August 9, 2005
    Date of Patent: June 19, 2007
    Assignee: O2Micro International Limited
    Inventors: Zhao Wang, Ruiqing Xu
  • Publication number: 20070035259
    Abstract: The present invention is an inverter controller with feed-forward compensation. The inverter controller includes an error amplifier, a high frequency oscillator (HFOSC) with feed-forward compensation, a comparator, and a driver. The error amplifier can output a signal independent on the variation of a supply voltage. The HFOSC can generate a saw-tooth signal with a constant frequency and an amplitude proportional to the supply voltage. The comparator can compare the signal with the saw-tooth signal and generate a pulse width modulation signal whose duty cycle varies with the variation of the supply voltage. The driver receives the PWM signal and provides a proper pulse width modulation signal to drive an external inverter.
    Type: Application
    Filed: August 9, 2005
    Publication date: February 15, 2007
    Inventors: Zhao Wang, Ruiqing Xu
  • Publication number: 20070033237
    Abstract: The invention relates generally to archiving data items in an information store. More particularly, the invention provides a computerized method for identifying, in a first information store, a first data item satisfying retention criteria; copying the first data item to a second information store; creating, in the first information store, a second data item containing a subset of the data of the first data item selected based on the data tvpe of the first data item; and replacing the first data item, in the first information store, with the second data item.
    Type: Application
    Filed: July 31, 2006
    Publication date: February 8, 2007
    Inventors: Anand Prahlad, Andreas May, Zhao Wang, Randy Demeno, Tinku Iyer