Patents by Inventor Daolin Cai

Daolin Cai 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).

  • Data readout circuit of phase change memory
    Patent number: 8947924
    Abstract: A data readout circuit of phase change memory, relating to one or more phase change memory cells, wherein each phase change memory cell is connected to the control circuit by bit line and word line; said data readout circuit comprises: a clamp voltage generating circuit, used to generate a clamp voltage; a precharge circuit, used to fast charge bit line under the control of a clamp voltage; a clamped current generating circuit, used to generate a clamped current to keep bit line at clamped state under the control of a clamp voltage; a clamped current operation circuit, used to perform subtraction and multiplication on clamped current to increase the difference of clamped current between high resistance state and low resistance state; a sense amplifier circuit, used to compare the operated clamped current and the reference current and output the readout result.
    Type: Grant
    Filed: June 24, 2011
    Date of Patent: February 3, 2015
    Assignee: Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences
    Inventors: Xi Li, Houpeng Chen, Zhitang Song, Daolin Cai
  • DATA READOUT CIRCUIT OF PHASE CHANGE MEMORY
    Publication number: 20140078820
    Abstract: A data readout circuit of phase change memory, relating to one or more phase change memory cells, wherein each phase change memory cell is connected to the control circuit by bit line and word line; said data readout circuit comprises: a clamp voltage generating circuit, used to generate a clamp voltage; a precharge circuit, used to fast charge bit line under the control of a clamp voltage; a clamped current generating circuit, used to generate a clamped current to keep bit line at clamped state under the control of a clamp voltage; a clamped current operation circuit, used to perform subtraction and multiplication on clamped current to increase the difference of clamped current between high resistance state and low resistance state; a sense amplifier circuit, used to compare the operated clamped current and the reference current and output the readout result.
    Type: Application
    Filed: June 24, 2011
    Publication date: March 20, 2014
    Inventors: Xi Li, Houpeng Chen, Zhitang Song, Daolin Cai