Patents by Inventor Kehan Zhu

Kehan Zhu 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: 10530488
    Abstract: Examples disclosed herein relate to optical driver circuits. In some of the disclosed examples, an optical driver circuit includes a pre-driver circuit and a main driver circuit. The pre-driver circuit may include a pattern generator and at least one serializer to generate a main modulation signal and an inverted delayed modulation signal. The main driver circuit may include a level controller to control amplitudes of pre-emphasis on rising and falling edges of a modulation signal output and an equalization controller to transition the modulation signal output from the pre-emphasis amplitudes to main modulation amplitudes using the inverted delayed modulation signal.
    Type: Grant
    Filed: December 21, 2018
    Date of Patent: January 7, 2020
    Assignee: Hewlett Packard Enterprise Development LP
    Inventors: Cheng Li, Di Liang, Kehan Zhu
  • Patent number: 10432319
    Abstract: One example of a receiver includes a first stage, a second stage, a third stage, and an automatic gain controller. The first stage amplifies an input signal to provide a first signal. The second stage amplifies or attenuates the first signal to provide a second signal based on a tunable gain of the second stage. The tunable gain is adjusted in response to a differential signal. The third stage amplifies the second signal to provide an output signal. The automatic gain controller provides the differential signal based on a comparison between a peak voltage of the output signal and the sum of a common mode voltage of the output signal and an offset voltage.
    Type: Grant
    Filed: October 29, 2015
    Date of Patent: October 1, 2019
    Assignee: Hewlett Packard Enterprise Development LP
    Inventors: Kehan Zhu, Cheng Li, Marco Fiorentino
  • Publication number: 20190149244
    Abstract: Examples disclosed herein relate to optical driver circuits. In some of the disclosed examples, an optical driver circuit includes a pre-driver circuit and a main driver circuit. The pre-driver circuit may include a pattern generator and at least one serializer to generate a main modulation signal and an inverted delayed modulation signal. The main driver circuit may include a level controller to control amplitudes of pre-emphasis on rising and falling edges of a modulation signal output and an equalization controller to transition the modulation signal output from the pre-emphasis amplitudes to main modulation amplitudes using the inverted delayed modulation signal.
    Type: Application
    Filed: December 21, 2018
    Publication date: May 16, 2019
    Inventors: Cheng Li, Di Liang, Kehan Zhu
  • Publication number: 20190068292
    Abstract: One example of a receiver includes a first stage, a second stage, a third stage, and an automatic gain controller. The first stage amplifies an input signal to provide a first signal. The second stage amplifies or attenuates the first signal to provide a second signal based on a tunable gain of the second stage. The tunable gain is adjusted in response to a differential signal. The third stage amplifies the second signal to provide an output signal. The automatic gain controller provides the differential signal based on a comparison between a peak voltage of the output signal and the sum of a common mode voltage of the output signal and an offset voltage.
    Type: Application
    Filed: October 29, 2015
    Publication date: February 28, 2019
    Inventors: Kehan Zhu, Cheng Li, Marco Florentino
  • Patent number: 10193634
    Abstract: Examples disclosed herein relate to optical driver circuits. In some of the disclosed examples, an optical driver circuit includes a pre-driver circuit and a main driver circuit. The pre-driver circuit may include a pattern generator and at least one serializer to generate a main modulation signal and an inverted delayed modulation signal. The main driver circuit may include a level controller to control amplitudes of pre-emphasis on rising and falling edges of a modulation signal output and an equalization controller to transition the modulation signal output from the pre-emphasis amplitudes to main modulation amplitudes using the inverted delayed modulation signal.
    Type: Grant
    Filed: September 19, 2016
    Date of Patent: January 29, 2019
    Assignee: Hewlett Packard Enterprise Development LP
    Inventors: Cheng Li, Di Liang, Kehan Zhu
  • Patent number: 9973218
    Abstract: An example device in accordance with an aspect of the present disclosure includes at least one segment driver circuit having a first circuit and a second circuit, to receive input signals and provide output signals. A given segment driver circuit is to protect reliability and enable reconfigurability by selectively resetting coupling capacitors, and selectively cutting off the input signals from their respective segment driver circuit.
    Type: Grant
    Filed: September 15, 2016
    Date of Patent: May 15, 2018
    Assignee: Hewlett Packard Enterprise Development LP
    Inventors: Kehan Zhu, Cheng Li, Zhubiao Zhu
  • Publication number: 20180083711
    Abstract: Examples disclosed herein relate to optical driver circuits. In some of the disclosed examples, an optical driver circuit includes a pre-driver circuit and a main driver circuit. The pre-driver circuit may include a pattern generator and at least one serializer to generate a main modulation signal and an inverted delayed modulation signal. The main driver circuit may include a level controller to control amplitudes of pre-emphasis on rising and falling edges of a modulation signal output and an equalization controller to transition the modulation signal output from the pre-emphasis amplitudes to main modulation amplitudes using the inverted delayed modulation signal.
    Type: Application
    Filed: September 19, 2016
    Publication date: March 22, 2018
    Inventors: Cheng Li, Di Liang, Kehan Zhu
  • Publication number: 20180076836
    Abstract: An example device in accordance with an aspect of the present disclosure includes at least one segment driver circuit having a first circuit and a second circuit, to receive input signals and provide output signals. A given segment driver circuit is to protect reliability and enable reconfigurability by selectively resetting coupling capacitors, and selectively cutting off the input signals from their respective segment driver circuit.
    Type: Application
    Filed: September 15, 2016
    Publication date: March 15, 2018
    Inventors: Kehan Zhu, Cheng Li, Zhubiao Zhu