Patents by Inventor Haitao Gan

Haitao Gan 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).

  • Publication number: 20200007098
    Abstract: An apparatus is disclosed for dual-mode amplification by varying a load impedance. In an example aspect, the apparatus includes a low-noise amplifier, a first component, a second component, and a switch. The first component has a first input impedance. The second component is coupled between the low-noise amplifier and the first component. The second component has a second input impedance that is greater than the first input impedance. The switch is coupled in parallel with the second component between the low-noise amplifier and the first component. The switch is configured to selectively be in an open state to engage the second component or a closed state to bypass the second component.
    Type: Application
    Filed: August 28, 2018
    Publication date: January 2, 2020
    Inventors: Hung-Min Cheng, Ara Bicakci, Haitao Gan, Shen Wang, Mounir Bohsali, Hedieh Elyasi, Beomsup Kim
  • Patent number: 9756578
    Abstract: A method for inductively coupled communication is described. The method includes transmitting a carrier signal from a first device while receiving the carrier signal at a receiver of the first device. The method also includes determining a carrier level estimation using a loopback path on the receiver of the first device. The method further includes controlling a transmit power level of the first device based on a coupling strength with a second device as indicated by the carrier level estimation.
    Type: Grant
    Filed: April 10, 2015
    Date of Patent: September 5, 2017
    Assignee: QUALCOMM Incorporated
    Inventors: Angelica Wong, Haitao Gan, Rainer Gaethke, Niranjan Anand Talwalkar
  • Publication number: 20160302159
    Abstract: A method for inductively coupled communication is described. The method includes transmitting a carrier signal from a first device while receiving the carrier signal at a receiver of the first device. The method also includes determining a carrier level estimation using a loopback path on the receiver of the first device. The method further includes controlling a transmit power level of the first device based on a coupling strength with a second device as indicated by the carrier level estimation.
    Type: Application
    Filed: April 10, 2015
    Publication date: October 13, 2016
    Inventors: Angelica Wong, Haitao Gan, Rainer Gaethke, Niranjan Anand Talwalkar
  • Publication number: 20160248459
    Abstract: A method is described. The method includes receiving a carrier signal by a communication device. The method also includes determining a carrier level estimation of the carrier signal using a carrier estimation path. The method further includes adjusting an attenuation and/or receiver path gain based on the carrier level estimation. The communication device may be an initiator near field communication (NFC) device.
    Type: Application
    Filed: February 19, 2015
    Publication date: August 25, 2016
    Inventors: Haitao Gan, Angelica Wong
  • Publication number: 20160149735
    Abstract: Systems and methods relate to extracting a small sideband signal from a received signal having the small sideband with a small frequency offset from a large carrier signal. The received signal is down-converted from a transmission frequency and the large carrier signal is filtered out. A threshold comparator is configured to compare the resultant sideband signal with a first signal threshold and a second signal threshold. If the sideband signal exceeds the first signal threshold in a first direction, the sideband signal is restored to a data signal with a first data value. The restored data signal is retained at the first data value until the sideband signal exceeds a second signal threshold in a second direction, at which time the sideband signal is restored to the data signal with a second data value.
    Type: Application
    Filed: November 21, 2014
    Publication date: May 26, 2016
    Inventors: Angelica WONG, Haitao GAN
  • Publication number: 20140287708
    Abstract: A circuit used in a mixer configured to receive a signal made up of a relatively small modulation signal and a relatively large carrier signal is described. The mixer includes multiple switches. A balancing circuit configured to receive a supply voltage and a clocking signal is provided, and the balancing circuit provides a control signal to a switch in the mixer. The balancing circuit includes a capacitor configured to receive and selectively dissipate charge as a gate voltage along a gate path. The control signal causes switching of the switch in the mixer at times in accordance with the clocking signal according to a voltage difference value between a source voltage and the gate voltage, wherein the voltage difference value between the source voltage and the gate voltage is approximately a predetermined voltage value greater than a turn on voltage level of the switch.
    Type: Application
    Filed: June 10, 2014
    Publication date: September 25, 2014
    Inventors: Haitao Gan, Xiaoyong Li
  • Patent number: 8792847
    Abstract: A circuit used in a mixer configured to receive a signal made up of a relatively small modulation signal and a relatively large carrier signal is described. The mixer includes multiple switches. A balancing circuit configured to receive a supply voltage and a clocking signal is provided, and the balancing circuit provides a control signal to a switch in the mixer. The balancing circuit includes a capacitor configured to receive and selectively dissipate charge as a gate voltage along a gate path. The control signal causes switching of the switch in the mixer at times in accordance with the clocking signal according to a voltage difference value between a source voltage and the gate voltage, wherein the voltage difference value between the source voltage and the gate voltage is approximately a predetermined voltage value greater than a turn on voltage level of the switch.
    Type: Grant
    Filed: July 27, 2012
    Date of Patent: July 29, 2014
    Assignee: Qualcomm Incorporated
    Inventors: Haitao Gan, Xiaoyong Li
  • Publication number: 20140030996
    Abstract: A circuit used in a mixer configured to receive a signal made up of a relatively small modulation signal and a relatively large carrier signal is described. The mixer includes multiple switches. A balancing circuit configured to receive a supply voltage and a clocking signal is provided, and the balancing circuit provides a control signal to a switch in the mixer. The balancing circuit includes a capacitor configured to receive and selectively dissipate charge as a gate voltage along a gate path. The control signal causes switching of the switch in the mixer at times in accordance with the clocking signal according to a voltage difference value between a source voltage and the gate voltage, wherein the voltage difference value between the source voltage and the gate voltage is approximately a predetermined voltage value greater than a turn on voltage level of the switch.
    Type: Application
    Filed: July 27, 2012
    Publication date: January 30, 2014
    Applicant: QUALCOMM INCORPORATED
    Inventors: Haitao Gan, Xiaoyong Li