Patents by Inventor Qiurong He

Qiurong He 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).

  • Clock signal error correction in a digital-to-analog converter
    Patent number: 9154148
    Abstract: In an example, there is disclosed herein a digital-to-analog converter (DAC) including a correction circuit for a clock, including a differential clock. Error correction may take place within the DAC core, by means of replica cells that are substantially similar to conversion cells. Rather than contributing their output to the converted signal, the replica cells may be configured to provide a feedback signal to a clock receiver with information for correcting the clock signal. The feedback signal may be operable to correct errors, for example, in duty cycle and crosspoint, as measured at the DAC core.
    Type: Grant
    Filed: March 13, 2014
    Date of Patent: October 6, 2015
    Assignee: ANALOG DEVICES, INC.
    Inventors: Bernd Schafferer, Ping Wing Lai, Qiurong He
  • CLOCK SIGNAL ERROR CORRECTION IN A DIGITAL-TO-ANALOG CONVERTER
    Publication number: 20140313065
    Abstract: In an example, there is disclosed herein a digital-to-analog converter (DAC) including a correction circuit for a clock, including a differential clock. Error correction may take place within the DAC core, by means of replica cells that are substantially similar to conversion cells. Rather than contributing their output to the converted signal, the replica cells may be configured to provide a feedback signal to a clock receiver with information for correcting the clock signal. The feedback signal may be operable to correct errors, for example, in duty cycle and crosspoint, as measured at the DAC core.
    Type: Application
    Filed: March 13, 2014
    Publication date: October 23, 2014
    Applicant: ANALOG DEVICES, INC.
    Inventors: BERND SCHAFFERER, PING WING LAI, QIURONG HE
  • Output differential stage
    Patent number: 7659775
    Abstract: A bipolar differential output circuit includes an input differential bipolar stage for receiving an input signal and generating a differential output current. An output differential pair of bipolar transistors without a bipolar tail current source responds to the input signal by providing a representative output signal. And a current mirror circuit passes current from the input differential pair to the output differential pair.
    Type: Grant
    Filed: September 26, 2007
    Date of Patent: February 9, 2010
    Assignee: Analog Devices, Inc.
    Inventors: Qiurong He, Geoffrey T. Haigh
  • Output Differential Stage
    Publication number: 20080074188
    Abstract: A bipolar differential output circuit includes an input differential bipolar stage for receiving an input signal and generating a differential output current. An output differential pair of bipolar transistors without a bipolar tail current source responds to the input signal by providing a representative output signal. And a current mirror circuit passes current from the input differential pair to the output differential pair.
    Type: Application
    Filed: September 26, 2007
    Publication date: March 27, 2008
    Applicant: ANALOG DEVICES, INC.
    Inventors: Qiurong He, Geoffrey T. Haigh