Patents by Inventor Shu Dong Cheng

Shu Dong Cheng 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: 9444660
    Abstract: A method for offset cancellation in a receiver loss of signal (RxLOS) circuit of a serializer/deserializer (SerDes) receiver device includes receiving a differential input signal via the first stage of a peak detector cell of the RxLOS circuit and shorting the differential output of the first stage via a control switch of the second stage of the RxLOS circuit. The control switch may further transition the RxLOS circuit from normal operating mode to an offset cancellation mode wherein the control switch may manually or automatically short the differential output of the first stage.
    Type: Grant
    Filed: May 16, 2014
    Date of Patent: September 13, 2016
    Assignee: Avago Technologies General IP (Singapore) Pte. Ltd.
    Inventors: Shu Dong Cheng, Ming Chen, Yan Xu, Dong Hui Wang, Jun Tian
  • Publication number: 20150312068
    Abstract: A method for offset cancellation in a receiver loss of signal (RxLOS) circuit of a serializer/deserializer (SerDes) receiver device includes receiving a differential input signal via the first stage of a peak detector cell of the RxLOS circuit and shorting the differential output of the first stage via a control switch of the second stage of the RxLOS circuit. The control switch may further transition the RxLOS circuit from normal operating mode to an offset cancellation mode wherein the control switch may manually or automatically short the differential output of the first stage.
    Type: Application
    Filed: May 16, 2014
    Publication date: October 29, 2015
    Inventors: Shu Dong Cheng, Ming Chen, Yan Xu, Dong Hui Wang, Jun Tian
  • Publication number: 20150137855
    Abstract: An apparatus for converting current to voltage includes a pair of current inputs, a differential voltage output connected to the pair of current inputs, a current summing node connected to the pair of current inputs through a first resistor branch, a common mode feedback node connected to the pair of current inputs through a second resistor branch, an amplifier operable to generate a current control signal based at least in part on a voltage at the common mode feedback node, and a current controller operable to control a current through the current summing node based at least in part on the current control signal.
    Type: Application
    Filed: January 2, 2014
    Publication date: May 21, 2015
    Applicant: LSI Corporation
    Inventors: Dong Hui Wang, Zheng Xin Cao, Shu Dong Cheng, Yan Xu, Jie Hao Xu, Ming Chen
  • Patent number: 8624628
    Abstract: Described embodiments include a level shifter that provides a voltage level shift to applied signals, the amount of voltage shift being accurately controlled and independent of PVT. The level shifter has first transistor configured as a voltage follower with the gate coupled to an input terminal of the shifter and the source coupled to a node, a diode-connected transistor coupled between the node and an output terminal of the circuit, a first controlled current source coupled to the node, and a second controlled current source coupled to the output terminal. A controller receives a bandgap-stabilized voltage, squares the stabilized voltage to produce a control signal that controls the first and second controlled current sources. The voltage shift is proportional to a digitally-controlled scale factor (K) times the stabilized voltage. The ratio of the current from the first current source to the second current source is (K+1)/K.
    Type: Grant
    Filed: August 7, 2012
    Date of Patent: January 7, 2014
    Assignee: Agere Systems LLC
    Inventors: Ming Chen, Shu Dong Cheng
  • Patent number: 8411383
    Abstract: Various embodiments of the present invention provide systems and methods for signal offset cancellation. For example, a method for error cancellation is disclosed. The method includes: receiving an input signal that includes a second order error component; applying a transfer function to the processed input to reduce the second order error component; and providing an output signal that is the result of applying the transfer function to the input signal.
    Type: Grant
    Filed: December 31, 2009
    Date of Patent: April 2, 2013
    Assignee: LSI Corporation
    Inventors: Zhengxin Cao, Hao Qiong Chen, Shu Dong Cheng, De Qun Ma, Donghui Wang, Yan Xu
  • Publication number: 20110019301
    Abstract: Various embodiments of the present invention provide systems and methods for signal offset cancellation. For example, a method for error cancellation is disclosed. The method includes: receiving an input signal that includes a second order error component; applying a transfer function to the processed input to reduce the second order error component; and providing an output signal that is the result of applying the transfer function to the input signal.
    Type: Application
    Filed: December 31, 2009
    Publication date: January 27, 2011
    Inventors: Zhengxin Cao, Hao Qiong Chen, Shu Dong Cheng, De Qun Ma, Donghui Wang, Yan Xu