Patents by Inventor Keung Tang

Keung Tang 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: 12009811
    Abstract: A regeneration circuit includes a first inverting circuit, a second inverting circuit, a first transistor coupled to an input of the second inverting circuit, and a second transistor coupled to an input of the first inverting circuit. The regeneration circuit also includes a third transistor including a gate coupled to a gate of the first transistor, a first switch configured to couple the third transistor to the input of the second inverting circuit based on a voltage of the first inverting circuit, a fourth transistor including a gate coupled to a gate of the second transistor, and a second switch configured to couple the fourth transistor to the input of the first inverting circuit based on a voltage of the second inverting circuit.
    Type: Grant
    Filed: June 1, 2023
    Date of Patent: June 11, 2024
    Assignee: QUALCOMM INCORPORATED
    Inventors: Chiu Keung Tang, Zhiqin Chen
  • Publication number: 20230396247
    Abstract: A regeneration circuit includes a first inverting circuit, a second inverting circuit, a first transistor coupled to an input of the second inverting circuit, and a second transistor coupled to an input of the first inverting circuit. The regeneration circuit also includes a third transistor including a gate coupled to a gate of the first transistor, a first switch configured to couple the third transistor to the input of the second inverting circuit based on a voltage of the first inverting circuit, a fourth transistor including a gate coupled to a gate of the second transistor, and a second switch configured to couple the fourth transistor to the input of the first inverting circuit based on a voltage of the second inverting circuit.
    Type: Application
    Filed: June 1, 2023
    Publication date: December 7, 2023
    Inventors: Chiu Keung TANG, Zhiqin CHEN
  • Patent number: 11711077
    Abstract: A regeneration circuit includes a first inverting circuit and a second inverting circuit. The regeneration circuit also includes a first transistor coupled to an input of the second inverting circuit, and a second transistor coupled to an input of the first inverting circuit, a third transistor and a fourth transistor. A gate of the first transistor and a gate of the fourth transistor are coupled to a first input, and a gate of the second transistor and a gate of the fourth transistor are coupled to a second input. The regeneration circuit further includes a first switch and a second switch. The first switch and the third transistor are coupled in series between a first rail and the first transistor, and the second switch and the fourth transistor are coupled in series between the first rail and the second transistor.
    Type: Grant
    Filed: June 2, 2022
    Date of Patent: July 25, 2023
    Assignee: QUALCOMM INCORPORATED
    Inventors: Chiu Keung Tang, Zhiqin Chen
  • Patent number: 11329639
    Abstract: A novel delay circuit for quadrature clock generation with insensitivity to process, voltage, temperature (PVT) variations and equal rising/falling edges is disclosed. In one implementation, the delay circuit includes a first N-substage having a sinking current source, configured to receive an input signal and to generate a rising edge of an output signal of the delay circuit, wherein the output signal is a delayed version of the input signal. The delay circuit further includes a first P-substage having a sourcing current source, configured to receive the input signal and to generate a falling edge of the output signal, where the sinking current source and the sourcing current source are variable in response to respective ones of a plurality of bias voltages.
    Type: Grant
    Filed: March 25, 2021
    Date of Patent: May 10, 2022
    Assignee: QUALCOMM INCORPORATED
    Inventors: Chiu Keung Tang, Zhiqin Chen
  • Patent number: 11193961
    Abstract: Apparatuses and methods of current balancing, current sensing and phase balancing, offset cancellation, digital to analog current converter with monotonic output using binary coded input (without binary to thermometer decoder), compensator for a voltage regulator (VR), etc.
    Type: Grant
    Filed: May 4, 2020
    Date of Patent: December 7, 2021
    Assignee: Intel Corporation
    Inventors: Gerhard Schrom, J. Keith Hodgson, Alexander Lyakhov, Chiu Keung Tang, Narayanan Raghuraman, Narayanan Natarajan
  • Publication number: 20200264214
    Abstract: Described are apparatuses and methods of current balancing, current sensing and phase balancing, offset cancellation, digital to analog current converter with monotonic output using binary coded input (without binary to thermometer decoder), compensator for a voltage regulator (VR), etc. In one example, apparatus comprises: a plurality of inductors coupled to a capacitor and a load; a plurality of bridges, each of which is coupled to a corresponding inductor from the plurality of inductors; and a plurality of current sensors, each of which is coupled to a bridge to sense current through a transistor of the bridge.
    Type: Application
    Filed: May 4, 2020
    Publication date: August 20, 2020
    Applicant: Intel Corporation
    Inventors: Gerhard SCHROM, J. Keith HODGSON, Alexander LYAKHOV, Chiu Keung TANG, Narayanan RAGHURAMAN, Narayanan NATARAJAN
  • Patent number: 10641799
    Abstract: Apparatuses and methods of current balancing, current sensing and phase balancing, offset cancellation, digital to analog current converter with monotonic output using binary coded input (without binary to thermometer decoder), and compensator for a voltage regulator (VR), are provided. In one example, an apparatus includes: a plurality of inductors coupled to a capacitor and a load; a plurality of bridges, each of which is coupled to a corresponding inductor from the plurality of inductors; and a plurality of current sensors, each of which is coupled to a bridge to sense current through a transistor of the bridge.
    Type: Grant
    Filed: January 22, 2019
    Date of Patent: May 5, 2020
    Assignee: Intel Corporation
    Inventors: Gerhard Schrom, J. Keith Hodgson, Alexander Lyakhov, Chiu Keung Tang, Narayanan Raghuraman, Narayanan Natarajan
  • Patent number: 10608077
    Abstract: A semiconductor device includes a substrate of a first conductivity type with relatively low impurity concentration; a first region of a second conductivity type with relatively low impurity concentration, =located in the substrate; a second region of the first conductivity type with relatively high impurity concentration, located in the substrate; first and second conductors, located on the first region and separated from each other by an isolator layer; and a third conductor, separated from the first and second conductors by the isolator layer, and located on the second region. The first conductor provides a drain terminal. The second conductor provides a source terminal. The third conductor provides a gate terminal.
    Type: Grant
    Filed: July 20, 2018
    Date of Patent: March 31, 2020
    Assignee: Mosway Technologies Limited
    Inventors: Chi Keung Tang, Peter On Bon Chan
  • Publication number: 20200027948
    Abstract: A semiconductor device includes a substrate of a first conductivity type with relatively low impurity concentration; a first region of a second conductivity type with relatively low impurity concentration, =located in the substrate; a second region of the first conductivity type with relatively high impurity concentration, located in the substrate; first and second conductors, located on the first region and separated from each other by an isolator layer; and a third conductor, separated from the first and second conductors by the isolator layer, and located on the second region. The first conductor provides a drain terminal. The second conductor provides a source terminal. The third conductor provides a gate terminal.
    Type: Application
    Filed: July 20, 2018
    Publication date: January 23, 2020
    Inventors: Chi Keung TANG, Peter On Bon CHAN
  • Publication number: 20190154739
    Abstract: Described are apparatuses and methods of current balancing, current sensing and phase balancing, offset cancellation, digital to analog current converter with monotonic output using binary coded input (without binary to thermometer decoder), compensator for a voltage regulator (VR), etc. In one example, apparatus comprises: a plurality of inductors coupled to a capacitor and a load; a plurality of bridges, each of which is coupled to a corresponding inductor from the plurality of inductors; and a plurality of current sensors, each of which is coupled to a bridge to sense current through a transistor of the bridge.
    Type: Application
    Filed: January 22, 2019
    Publication date: May 23, 2019
    Applicant: Intel Corporation
    Inventors: Gerhard SCHROM, J. Keith HODGSON, Alexander LYAKHOV, Chiu Keung TANG, Narayanan RAGHURAMAN, Narayanan NATARAJAN
  • Patent number: 10191526
    Abstract: A transmit driver is configured to operate under distinct supply voltage provided at output differential terminals. The transmit driver includes differential input transistors, first and second pairs of over-voltage protection differential transistors, and a current source coupled in series between the output terminals and a lower voltage rail. The transmit driver includes a first bias voltage generator configured to generate a first bias voltage based on the supply voltage across the output differential terminals. The first bias voltage is applied to the control terminals of the first pair of over-voltage protection transistors. The transmit driver includes a second bias generator for generating a second (substantially fixed) bias voltage for the control terminals of the second pair of over-voltage protection transistors. The transmit driver may be configured to operate based on a 3.3V supply voltage provided by an HDMI sink, or based on a 1.8V supply voltage provided by a bridge chip.
    Type: Grant
    Filed: November 8, 2016
    Date of Patent: January 29, 2019
    Assignee: QUALCOMM Incorporated
    Inventors: Madjid Hafizi, Chiu Keung Tang
  • Patent number: 10187943
    Abstract: A direct drive LED lighting circuit includes a LED current control circuit with a power switching device; a current sensing device, an averaging circuit, and an error amplifier. A LED chain circuit is formed by connecting several LEDs in series with a capacitor connecting in parallel with the series of LEDs, with a current flowing in side as a positive terminal, and a current leaving terminal as a negative terminal. The LED chain circuit and the LED current control circuit are connecting in series and the whole circuit is connected between the positive and negative terminals of a rectified AC power source.
    Type: Grant
    Filed: June 10, 2015
    Date of Patent: January 22, 2019
    Assignee: Mosway Semiconductor Ltd.
    Inventors: Chiu Sing Celement Tse, On Bon Peter Chan, Chi Keung Tang
  • Patent number: 10184961
    Abstract: Described are apparatuses and methods of current balancing, current sensing and phase balancing, offset cancellation, digital to analog current converter with monotonic output using binary coded input (without binary to thermometer decoder), compensator for a voltage regulator (VR), etc. In one example, apparatus comprises: a plurality of inductors coupled to a capacitor and a load; a plurality of bridges, each of which is coupled to a corresponding inductor from the plurality of inductors; and a plurality of current sensors, each of which is coupled to a bridge to sense current through a transistor of the bridge.
    Type: Grant
    Filed: September 26, 2016
    Date of Patent: January 22, 2019
    Assignee: Intel Corporation
    Inventors: Gerhard Schrom, J. Keith Hodgson, Alexander Lyakhov, Chiu Keung Tang, Narayanan Raghuraman, Narayanan Natarajan
  • Patent number: 10170401
    Abstract: An integrated power module comprising a power board including at least one power switching device, a driver board including at least one driver for driving a gate of the at least one power switching device, and an interconnection extending across the power board and the driver board mechanically connecting the power board and the driver board together. Included are a lead frame to which the power board and the driver board are mounted, and a package encapsulating the power board and the driver board mounted on the lead frame. Also disclosed is a method for manufacturing the integrated power module.
    Type: Grant
    Filed: July 15, 2016
    Date of Patent: January 1, 2019
    Assignee: Mosway Technologies Limited
    Inventors: Celement Chiu Sing Tse, Peter On Bon Chan, Chi Keung Tang
  • Patent number: 10164538
    Abstract: A supply circuit includes a rectifying bridge arranged in series between two high voltage capacitors. An AC line provides an intermediate voltage to a low voltage capacitor through the two high voltage capacitors. A plurality of resistors mounted in series with the two high voltage capacitors. A voltage clamping device limits the intermediate voltage at the low voltage capacitor and a linear series regulator provides an output DC voltage.
    Type: Grant
    Filed: June 14, 2017
    Date of Patent: December 25, 2018
    Assignee: Mosway Semiconductor Limited
    Inventors: Chi-Keung Tang, Chiu-Sing Celement Tse, Ngai Wa Wong
  • Publication number: 20180367041
    Abstract: A supply circuit includes a rectifying bridge arranged in series between two high voltage capacitors. An AC line provides an intermediate voltage to a low voltage capacitor through the two high voltage capacitors. A plurality of resistors mounted in series with the two high voltage capacitors. A voltage clamping device limits the intermediate voltage at the low voltage capacitor and a linear series regulator provides an output DC voltage.
    Type: Application
    Filed: June 14, 2017
    Publication date: December 20, 2018
    Inventors: Chi-Keung Tang, Chiu-Sing Celement Tse, Ngai Wa Wong
  • Publication number: 20180129256
    Abstract: A transmit driver is configured to operate under distinct supply voltage provided at output differential terminals. The transmit driver includes differential input transistors, first and second pairs of over-voltage protection differential transistors, and a current source coupled in series between the output terminals and a lower voltage rail. The transmit driver includes a first bias voltage generator configured to generate a first bias voltage based on the supply voltage across the output differential terminals. The first bias voltage is applied to the control terminals of the first pair of over-voltage protection transistors. The transmit driver includes a second bias generator for generating a second (substantially fixed) bias voltage for the control terminals of the second pair of over-voltage protection transistors. The transmit driver may be configured to operate based on a 3.3V supply voltage provided by an HDMI sink, or based on a 1.8V supply voltage provided by a bridge chip.
    Type: Application
    Filed: November 8, 2016
    Publication date: May 10, 2018
    Inventors: Madjid Hafizi, Chiu Keung Tang
  • Patent number: 9733282
    Abstract: Apparatuses and methods of current balancing, current sensing and phase balancing, offset cancellation, digital to analog current converter with monotonic output using binary coded input (without binary to thermometer decoder), compensator for a voltage regulator (VR), etc. are provided here. An apparatus is provided which comprises: a plurality of inductors coupled to a capacitor and a load; a plurality of bridges, each of which is coupled to a corresponding inductor from the plurality of inductors; and a plurality of current sensors, each of which is coupled to a bridge to sense current through a transistor of the bridge.
    Type: Grant
    Filed: November 17, 2014
    Date of Patent: August 15, 2017
    Assignee: Intel Corporation
    Inventors: Gerhard Schrom, J. Keith Hodgson, Alexander Lyakhov, Chiu Keung Tang, Narayanan Raghuraman, Narayanan Natarajan
  • Patent number: 9696350
    Abstract: Described is an apparatus having a non-linear control to manage power supply droop at an output of a voltage regulator. The apparatus comprises: a first inductor for coupling to a load; a capacitor, coupled to the first inductor, and for coupling to the load; a first high-side switch couple to the first inductor; a first low-side switch coupled to the first inductor; a bridge controller to control when to turn on and off the first high-side and first low-side switches; and a non-linear control (NLC) unit to monitor output voltage on the load, and to cause the bridge controller to turn on the first high-side switch and turn off the first low-side switch when a voltage droop is detected on the load.
    Type: Grant
    Filed: May 31, 2013
    Date of Patent: July 4, 2017
    Assignee: Intel Corporation
    Inventors: Edward A. Burton, Gerhard Schrom, Michael W. Rogers, Alexander Lyakhov, Ravi Sankar Vunnam, Jonathan P. Douglas, Fabrice Paillet, J. Keith Hodgson, William Dawson Kesling, Chiu Keung Tang, Narayanan Raghuraman, Narayanan Natarajan, Samie Samaan, George Geannopoulos
  • Publication number: 20170030947
    Abstract: Described are apparatuses and methods of current balancing, current sensing and phase balancing, offset cancellation, digital to analog current converter with monotonic output using binary coded input (without binary to thermometer decoder), compensator for a voltage regulator (VR), etc. In one example, apparatus comprises: a plurality of inductors coupled to a capacitor and a load; a plurality of bridges, each of which is coupled to a corresponding inductor from the plurality of inductors; and a plurality of current sensors, each of which is coupled to a bridge to sense current through a transistor of the bridge.
    Type: Application
    Filed: September 26, 2016
    Publication date: February 2, 2017
    Inventors: Gerhard SCHROM, J. Keith Hodgson, Alexander Lyakhov, Chiu Keung Tang, Narayanan Raghuraman, Narayanan Natarajan