Patents by Inventor Quan Wan

Quan Wan 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: 11017784
    Abstract: Methods, systems, apparatus, including computer programs encoded on computer storage medium, to facilitate language independent-speaker verification. In one aspect, a method includes actions of receiving, by a user device, audio data representing an utterance of a user. Other actions may include providing, to a neural network stored on the user device, input data derived from the audio data and a language identifier. The neural network may be trained using speech data representing speech in different languages or dialects. The method may include additional actions of generating, based on output of the neural network, a speaker representation and determining, based on the speaker representation and a second representation, that the utterance is an utterance of the user. The method may provide the user with access to the user device based on determining that the utterance is an utterance of the user.
    Type: Grant
    Filed: August 30, 2019
    Date of Patent: May 25, 2021
    Assignee: Google LLC
    Inventors: Ignacio Lopez Moreno, Li Wan, Quan Wang
  • Patent number: 11009031
    Abstract: A fan includes a metal plate, multiple cylindrical coils, a frame and an impeller. Multiple teeth annularly arranged and connected with each other are formed on the metal plate. Each cylindrical coil is arranged between adjacent teeth, and each end of the cylindrical coil is arranged toward corresponding tooth. The frame is arranged on a surface of the metal plate and extended along an edge of the metal plate. A flow channel and an air outlet connected to the flow channel are formed by the frame. The impeller is arranged in the flow channel. A stator structure of the fan is simplified by forming the teeth on the metal plate.
    Type: Grant
    Filed: November 26, 2018
    Date of Patent: May 18, 2021
    Assignee: COOLER MASTER CO., LTD.
    Inventors: Fu-Lung Lin, Shih-Wei Huang, Ai-Quan Wan
  • Patent number: 10958227
    Abstract: An amplifier circuit comprises a differential input stage configured to receive a differential input signal, wherein the differential input stage is susceptible to an offset error that includes a linear offset error portion and a nonlinear offset error portion; and an offset error correction circuit coupled to the differential input stage and configured to apply a second order error correction signal to the differential input stage to reduce the nonlinear portion of the offset error.
    Type: Grant
    Filed: May 7, 2019
    Date of Patent: March 23, 2021
    Assignee: Analog Devices, Inc.
    Inventor: Quan Wan
  • Publication number: 20200358412
    Abstract: An amplifier circuit comprises a differential input stage configured to receive a differential input signal, wherein the differential input stage is susceptible to an offset error that includes a linear offset error portion and a nonlinear offset error portion; and an offset error correction circuit coupled to the differential input stage and configured to apply a second order error correction signal to the differential input stage to reduce the nonlinear portion of the offset error.
    Type: Application
    Filed: May 7, 2019
    Publication date: November 12, 2020
    Inventor: Quan Wan
  • Publication number: 20200200812
    Abstract: A difference amplifier can he used for providing an amplified representation of a sensed current through a load device. A separate signal path can be used to provide fast fault detection, without requiring use of the difference amplifier. For example, a voltage scaling circuit can be used to scale a differential input signal indicative of the load current. The scaled representation can then be compared against a specified threshold corresponding to a fault current value. In this manner, a high-speed low-voltage comparator can be used to provide detection of a fault current that otherwise exceeds an input range of the difference amplifier, where the difference amplifier is used separately for precision current monitoring. As an illustrative example, such a scheme can provide fault detection even when an input of the difference amplifier is saturated.
    Type: Application
    Filed: December 21, 2018
    Publication date: June 25, 2020
    Inventors: Quan Wan, Brian A. Pelletier
  • Patent number: 10587228
    Abstract: An amplifier circuit can have a differential input. A common-mode signal present at the differential input can induce an offset voltage at an output of the amplifier circuit. A compensation can be performed to reduce or eliminate such an offset, such as at a first temperature. Circuits and techniques for drift correction can be performed, such as to correct for residual offset error across an entirety of a specified operation temperature range. In an example, first and second drift correction signal generator circuits can be used, such as to provide signals proportional to a common mode voltage, but having different temperature coefficients.
    Type: Grant
    Filed: July 12, 2018
    Date of Patent: March 10, 2020
    Assignee: Analog Devices, Inc.
    Inventor: Quan Wan
  • Publication number: 20200021248
    Abstract: An amplifier circuit can have a differential input. A common-mode signal present at the differential input can induce an offset voltage at an output of the amplifier circuit. A compensation can be performed to reduce or eliminate such an offset, such as at a first temperature. Circuits and techniques for drift correction can be performed, such as to correct for residual offset error across an entirety of a specified operation temperature range. In an example, first and second drift correction signal generator circuits can be used, such as to provide signals proportional to a common mode voltage, but having different temperature coefficients.
    Type: Application
    Filed: July 12, 2018
    Publication date: January 16, 2020
    Inventor: Quan Wan
  • Patent number: 10528070
    Abstract: A low-noise, low-power reference voltage circuit can include an operational transconductance amplifier (OTA) with inputs coupled to a temperature-compensated voltage, such as can be provided by source-coupled first and second field-effect transistors (FETs) having different threshold voltages. A capacitive voltage divider can feed back a portion of a reference voltage output by the OTA to the inputs of the OTA to help establish or maintain the temperature-compensated voltage across the inputs of the OTA. A switching network can be used, such as initialize the capacitive voltage divider or other capacitive feedback circuit, such as during power-down cycles, or when resuming powered-on cycles. A switch can interrupt current to the OTA during the power-down cycles to save power. The cycled voltage reference circuit can provide a reference voltage to an ADC reservoir capacitor. Powering down can occur during analog input signal sampling, during successive approximation routine (SAR) conversion, or both.
    Type: Grant
    Filed: May 2, 2018
    Date of Patent: January 7, 2020
    Assignee: Analog Devices Global Unlimited Company
    Inventors: Michael C. W. Coln, Michael Mueck, Quan Wan, Sandeep Monangi
  • Publication number: 20190339730
    Abstract: A low-noise, low-power reference voltage circuit can include an operational transconductance amplifier (OTA) with inputs coupled to a temperature-compensated voltage, such as can be provided by source-coupled first and second field-effect transistors (FETs) having different threshold voltages. A capacitive voltage divider can teed back a portion of a reference voltage output by the OTA to the inputs of the OTA to help establish or maintain the temperature-compensated voltage across the inputs of the OTA. A switching network can be used, such as initialize the capacitive voltage divider or other capacitive feedback circuit, such as during power-down cycles, or when resuming powered-on cycles. A switch can interrupt current to the OTA during the power-down cycles to save power. The cycled voltage reference circuit can provide a reference voltage to an ADC reservoir capacitor. Powering down can occur during analog input signal sampling, during successive approximation routine (SAR) conversion, or both.
    Type: Application
    Filed: May 2, 2018
    Publication date: November 7, 2019
    Inventors: Michael C.W. Coln, Michael Mueck, Quan Wan, Sandeep Monangi
  • Patent number: 10312865
    Abstract: A difference amplifier circuit can be used to amplify a differential input signal representative of a current flowing through a current sensing element, such as a resistor. In certain applications, a common mode voltage established at an input of the difference amplifier circuit can be greater in magnitude than a supply voltage provided to the difference amplifier circuit. A component of the differential input signal, such as one polarity of the differential signal, can be used to power the difference amplifier circuit. Such powering of the difference amplifier by the component of the differential input signal can be performed selectively, such as when a magnitude of the common mode voltage exceeds the supply voltage or another specified threshold. In this manner, a common mode input voltage capability can be greater in magnitude than a magnitude of a supply input voltage provided to an integrated circuit including the difference amplifier circuit.
    Type: Grant
    Filed: October 16, 2017
    Date of Patent: June 4, 2019
    Assignee: Analog Devices, Inc.
    Inventor: Quan Wan
  • Publication number: 20190115874
    Abstract: A difference amplifier circuit can be used to amplify a differential input signal representative of a current flowing through a current sensing element, such as a resistor. In certain applications, a common mode voltage established at an input of the difference amplifier circuit can be greater in magnitude than a supply voltage provided to the difference amplifier circuit. A component of the differential input signal, such as one polarity of the differential signal, can be used to power the difference amplifier circuit. Such powering of the difference amplifier by the component of the differential input signal can be performed selectively, such as when a magnitude of the common mode voltage exceeds the supply voltage or another specified threshold. In this manner, a common mode input voltage capability can be greater in magnitude than a magnitude of a supply input voltage provided to an integrated circuit including the difference amplifier circuit.
    Type: Application
    Filed: October 16, 2017
    Publication date: April 18, 2019
    Inventor: Quan Wan
  • Patent number: 10263581
    Abstract: An amplifier circuit can include an amplifier and a resistor network coupled to the amplifier. The resistor network can include a range resistor coupled in parallel to a resistor string, and one or more switches coupled to the resistor string. The resistor network can be used to calibrate gain and common mode rejection ratio (CMRR) of the amplifier circuit.
    Type: Grant
    Filed: September 30, 2016
    Date of Patent: April 16, 2019
    Assignee: Analog Devices, Inc.
    Inventor: Quan Wan
  • Publication number: 20190093661
    Abstract: A fan includes a metal plate, multiple cylindrical coils, a frame and an impeller. Multiple teeth annularly arranged and connected with each other are formed on the metal plate. Each cylindrical coil is arranged between adjacent teeth, and each end of the cylindrical coil is arranged toward corresponding tooth. The frame is arranged on a surface of the metal plate and extended along an edge of the metal plate. A flow channel and an air outlet connected to the flow channel are formed by the frame. The impeller is arranged in the flow channel. A stator structure of the fan is simplified by forming the teeth on the metal plate.
    Type: Application
    Filed: November 26, 2018
    Publication date: March 28, 2019
    Applicant: COOLER MASTER CO.,LTD.
    Inventors: Fu-Lung LIN, Shih-Wei HUANG, Ai-Quan WAN
  • Patent number: 10180144
    Abstract: A fan includes a metal plate (100), multiple cylindrical coils (300), a frame (130) and an impeller (400). Multiple teeth (110) annularly arranged and connected with each other are formed on the metal plate (100). Each cylindrical coil (300) is arranged between adjacent teeth (110), and each end of the cylindrical coil (300) is arranged toward corresponding tooth (110). The frame (130) is arranged on a surface of the metal plate (100) and extended along an edge of the metal plate (100). A flow channel (131) and an air outlet (132) connected to the flow channel (131) are formed by the frame (130). The impeller (400) is arranged in the flow channel (131). A stator structure of the fan is simplified by forming the teeth (11) on the metal plate (100).
    Type: Grant
    Filed: October 2, 2015
    Date of Patent: January 15, 2019
    Assignee: COOLER MASTER CO., LTD.
    Inventors: Fu-Lung Lin, Shih-Wei Huang, Ai-Quan Wan
  • Publication number: 20180097491
    Abstract: An amplifier circuit can include an amplifier and a resistor network coupled to the amplifier. The resistor network can include a range resistor coupled in parallel to a resistor string, and one or more switches coupled to the resistor string. The resistor network can be used to calibrate gain and common mode rejection ratio (CMRR) of the amplifier circuit.
    Type: Application
    Filed: September 30, 2016
    Publication date: April 5, 2018
    Inventor: Quan Wan
  • Publication number: 20160102669
    Abstract: A fan includes a metal plate (100), multiple cylindrical coils (300), a frame (130) and an impeller (400). Multiple teeth (110) annularly arranged and connected with each other are formed on the metal plate (100). Each cylindrical coil (300) is arranged between adjacent teeth (110), and each end of the cylindrical coil (300) is arranged toward corresponding tooth (110). The frame (130) is arranged on a surface of the metal plate (100) and extended along an edge of the metal plate (100). A flow channel (131) and an air outlet (132) connected to the flow channel (131) are formed by the frame (130). The impeller (400) is arranged in the flow channel (131). A stator structure of the fan is simplified by forming the teeth (11) on the metal plate (100).
    Type: Application
    Filed: October 2, 2015
    Publication date: April 14, 2016
    Inventors: Fu-Lung LIN, Shih-Wei HUANG, Ai-Quan WAN
  • Patent number: 8902005
    Abstract: Apparatus and methods reduce increase the common mode range of a difference amplifier. A circuit uses one or more floating powers and one or more floating grounds coupled to an input stage of an amplifier to increase the common mode range of a difference amplifier. The floating power can be configured to select from the greater of the voltage level of one of the differential signals and the system power high source. The floating ground can be configured to select from the lesser of the voltage level of one of the differential signals and the system power low source.
    Type: Grant
    Filed: September 25, 2012
    Date of Patent: December 2, 2014
    Assignee: Analog Devices, Inc.
    Inventor: Quan Wan
  • Patent number: 8773199
    Abstract: Compensation methods and systems for voltage-feedback amplifiers provide improved dynamic performance (i.e., increased bandwidth and the elimination or alleviation of a slew limitation) at various gains by self-adaptively changing the Miller effect with respect to the gain setting.
    Type: Grant
    Filed: September 26, 2012
    Date of Patent: July 8, 2014
    Assignee: Analog Devices, Inc.
    Inventor: Quan Wan
  • Patent number: 8723604
    Abstract: Compensation methods and systems for voltage-feedback amplifiers provide improved dynamic performance (i.e., increased bandwidth and the elimination or alleviation of a slew limitation) at high gains by direct feedback of an AC signal (i.e., an intermediate voltage) to an amplifier input without being attenuated by feedback resistor network.
    Type: Grant
    Filed: May 4, 2012
    Date of Patent: May 13, 2014
    Assignee: Analog Devices, Inc.
    Inventor: Quan Wan
  • Publication number: 20140084999
    Abstract: Apparatus and methods reduce increase the common mode range of a difference amplifier. A circuit uses one or more floating powers and one or more floating grounds coupled to an input stage of an amplifier to increase the common mode range of a difference amplifier. The floating power can be configured to select from the greater of the voltage level of one of the differential signals and the system power high source. The floating ground can be configured to select from the lesser of the voltage level of one of the differential signals and the system power low source.
    Type: Application
    Filed: September 25, 2012
    Publication date: March 27, 2014
    Applicant: ANALOG DEVICES, INC.
    Inventor: Quan Wan