Patents by Inventor Tim Chan

Tim Chan 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: 11245391
    Abstract: Described herein are multiple designs for an improved analog switch for use in transmitting high voltage signals without using high voltage power supplies for the switch. The analog switches are able to pass and block input signals in the approximate range of ?100 V to +100 V. The use of translinear loops and a bootstrap configuration results in a constant on-resistance of the symmetrical switches and matches the conductance of each analog switch to the transconductance of an NMOS transistor, which can be easily stabilized with a constant gm biasing scheme. In certain embodiments, a shunt termination (T-switch) configuration is used for better off-isolation, and each of the symmetrical switches has its own translinear loop and thus flexibility of on-resistance and termination voltage.
    Type: Grant
    Filed: July 20, 2020
    Date of Patent: February 8, 2022
    Assignee: MICROCHIP TECHNOLOGY INC.
    Inventors: Isaac Ko, Ka Wai Ho, Wan Tim Chan, Jimes Lei
  • Publication number: 20210367500
    Abstract: Disclosed herein is a method. An output voltage level is sensed. Determining if a power source delivers power to a system. If the output voltage is higher than a designed voltage threshold (Vh), then the power source will stop delivery of power to a circuit. If the output voltage is lower than another voltage threshold (Vl), the power source transfers power to the system until the output voltage reaches the designed voltage threshold (Vh).
    Type: Application
    Filed: May 19, 2020
    Publication date: November 25, 2021
    Inventors: Ka Wai Ho, Wan Tim Chan, Ngai Wa Wong, Chiu Sing Celement Tse
  • Publication number: 20210295664
    Abstract: A video-based security system for providing video security to cargo transport vehicle. The security system includes a camera support configured at the exterior of a cargo storage area; a camera system attached to the camera support for covering a top plane, front plane, left plane, right plane, and back plane of a cargo area; and a main unit connecting to the camera system for logging incident records.
    Type: Application
    Filed: March 19, 2020
    Publication date: September 23, 2021
    Inventors: Kwong Yeung Simon Wong, To Bun Ng, Kwong Tim Chan
  • Publication number: 20210175796
    Abstract: Disclosed herein is a fast voltage stabilizer wherein an actual voltage across a targeted electronic element is sensed. The actual voltage is compared with a reference voltage. A control signal is generated, wherein in response to the control signal, an external current path is provided to maintain current flow and stabilize the actual voltage through charging or discharging an input capacitor and a supply filtering capacitor. Under an arbitrary supply voltage variation, a fast dynamic response to regulate the voltage across the targeted electronic element is provided no matter what the operating mode of the entire electrical circuit is, including but not limited by constant current mode, constant output resistant mode and constant power mode.
    Type: Application
    Filed: December 6, 2019
    Publication date: June 10, 2021
    Inventors: Ka Wai Ho, Chung Pui Tung, Po Wa Chow, Wing To Fan, Wan Tim Chan, Ke Wei Wang, Shu Hung Henry Chung, Chiu Sing Celement Tse
  • Publication number: 20210051287
    Abstract: Imaging circuitry may include circuits for implementing current or voltage mode feature extraction in the analog domain. The imaging circuitry may include pixels configured to generate pixel values. The pixel values may then be weighted using adjustable weighting circuits to generate corresponding weighted pixel values. The adjustable weighting circuits may be selectively coupled to the floating diffusion node in each pixel. The weighted pixels values may then be combined to obtain an output neuron voltage for at least one layer in a neural network. Performing feature extraction in the analog domain for each layer of results in the neural network saves power and area by avoiding the need to move data around to conventional digital memories.
    Type: Application
    Filed: March 24, 2020
    Publication date: February 18, 2021
    Applicant: SEMICONDUCTOR COMPONENTS INDUSTRIES, LLC
    Inventors: Roger PANICACCI, Tim CHAN
  • Publication number: 20200350901
    Abstract: Described herein are multiple designs for an improved analog switch for use in transmitting high voltage signals without using high voltage power supplies for the switch. The analog switches are able to pass and block input signals in the approximate range of ?100 V to +100 V. The use of translinear loops and a bootstrap configuration results in a constant on-resistance of the symmetrical switches and matches the conductance of each analog switch to the transconductance of an NMOS transistor, which can be easily stabilized with a constant gm biasing scheme. In certain embodiments, a shunt termination (T-switch) configuration is used for better off-isolation, and each of the symmetrical switches has its own translinear loop and thus flexibility of on-resistance and termination voltage.
    Type: Application
    Filed: July 20, 2020
    Publication date: November 5, 2020
    Inventors: Isaac Ko, KA WAI HO, WAN TIM CHAN, JIMES LEI
  • Patent number: 10756719
    Abstract: Described herein are multiple designs for an improved analog switch for use in transmitting high voltage signals without using high voltage power supplies for the switch. The analog switches are able to pass and block input signals in the approximate range of ?100V to +100V. The use of translinear loops and a bootstrap configuration results in a constant on-resistance of the symmetrical switches and matches the conductance of each analog switch to the transconductance of an NMOS transistor, which can be easily stabilized with a constant gm biasing scheme. In certain embodiments, a shunt termination (T-switch) configuration is used for better off-isolation, and each of the symmetrical switches has its own translinear loop and thus flexibility of on-resistance and termination voltage.
    Type: Grant
    Filed: October 21, 2015
    Date of Patent: August 25, 2020
    Assignee: MICROCHIP TECHNOLOGY INC.
    Inventors: Isaac Ko, Ka Wai Ho, Wan Tim Chan, Jimes Lei
  • Patent number: 10637358
    Abstract: A current control circuit having a current regulation element, a first control circuit, and a second control circuit. The first control circuit is arranged to regulate, based on a reference current, a current flowing with respect to the current regulation element. The second control circuit is arranged to regulate, based on a reference voltage, a voltage across the current regulation element.
    Type: Grant
    Filed: December 18, 2017
    Date of Patent: April 28, 2020
    Assignee: Mosway Semiconductor Limited
    Inventors: Ka Wai Ho, Chung Pui Tung, Po Wa Chow, Wing To Fan, Wan Tim Chan, Shu Hung Henry Chung, Chiu Sing Tse
  • Patent number: 10468869
    Abstract: An analog transmit/receive switch and voltage detection circuit that do not require depletion mode devices are provided. The switch may be configured to operate in a receive mode and a protection mode. The voltage detection circuit may be coupled to the switch and may be configured to measure a potential difference between two terminals of the switch. The switch and the voltage detection circuit may not include any depletion mode devices.
    Type: Grant
    Filed: March 17, 2017
    Date of Patent: November 5, 2019
    Assignee: Microchip Technology Incorporated
    Inventors: Isaac Ko, Ka Wai Ho, Wan Tim Chan
  • Patent number: 10469043
    Abstract: An ultrasound probe buffer is provided. The ultrasound probe buffer may include a high impedance amplifier having a common-source core stage with series-series local feedback. The high impedance amplifier may include a first MOSFET and a second MOSFET, wherein a source terminal of the first MOSFET is coupled to a source terminal of the second MOSFET.
    Type: Grant
    Filed: March 17, 2017
    Date of Patent: November 5, 2019
    Assignee: Microchip Technology Incorporated
    Inventors: Isaac Ko, Ka Wai Ho, Wan Tim Chan
  • Publication number: 20190190389
    Abstract: A current control circuit having a current regulation element, a first control circuit, and a second control circuit. The first control circuit is arranged to regulate, based on a reference current, a current flowing with respect to the current regulation element. The second control circuit is arranged to regulate, based on a reference voltage, a voltage across the current regulation element.
    Type: Application
    Filed: December 18, 2017
    Publication date: June 20, 2019
    Inventors: Ka Wai HO, Chung Pui TUNG, Po Wa CHOW, Wing To FAN, Wan Tim CHAN, Shu Hung Henry CHUNG, Chiu Sing TSE
  • Patent number: 10171072
    Abstract: An improved analog switch for use in an ultrasound elastography probe is disclosed. The improved analog switch results in less heat dissipation compared to prior art analog switches.
    Type: Grant
    Filed: September 14, 2016
    Date of Patent: January 1, 2019
    Assignee: MICROCHIP TECHNOLOGY INC.
    Inventors: Isaac Ko, Ka Wai Ho, Wan Tim Chan
  • Publication number: 20180002397
    Abstract: Provided herein are chimeric antigen receptors (CARs) for cancer therapy, and more particularly, CARs containing a scFv from a CD33 monoclonal antibody. Provided are immune effector cells containing such CARs, and methods of treating proliferative disorders such as acute myeloid leukemia (AML), and relapsed or refractory AML.
    Type: Application
    Filed: June 7, 2017
    Publication date: January 4, 2018
    Inventors: Rutul Shah, Tim Chan, Peter Emtage, Ramya Yarlagadda
  • Publication number: 20170279263
    Abstract: An analog transmit/receive switch and voltage detection circuit that do not require depletion mode devices are provided. The switch may be configured to operate in a receive mode and a protection mode. The voltage detection circuit may be coupled to the switch and may be configured to measure a potential difference between two terminals of the switch. The switch and the voltage detection circuit may not include any depletion mode devices.
    Type: Application
    Filed: March 17, 2017
    Publication date: September 28, 2017
    Applicant: Microchip Technology Incorporated
    Inventors: Isaac Ko, Ka Wai Ho, Wan Tim Chan
  • Publication number: 20170279423
    Abstract: An ultrasound probe buffer is provided. The ultrasound probe buffer may include a high impedance amplifier having a common-source core stage with series-series local feedback. The high impedance amplifier may include a first MOSFET and a second MOSFET, wherein a source terminal of the first MOSFET is coupled to a source terminal of the second MOSFET.
    Type: Application
    Filed: March 17, 2017
    Publication date: September 28, 2017
    Applicant: Microchip Technology Incorporated
    Inventors: Isaac Ko, Ka Wai Ho, Wan Tim Chan
  • Publication number: 20170104481
    Abstract: An improved analog switch for use in an ultrasound elastography probe is disclosed. The improved analog switch results in less heat dissipation compared to prior art analog switches.
    Type: Application
    Filed: September 14, 2016
    Publication date: April 13, 2017
    Inventors: Isaac Ko, Ka Wai Ho, Wan Tim Chan
  • Publication number: 20160191036
    Abstract: Described herein are multiple designs for an improved analog switch for use in transmitting high voltage signals without using high voltage power supplies for the switch. The analog switches are able to pass and block input signals in the approximate range of ?100V to +100V. The use of translinear loops and a bootstrap configuration results in a constant on-resistance of the symmetrical switches and matches the conductance of each analog switch to the transconductance of an NMOS transistor, which can be easily stabilized with a constant gm biasing scheme. In certain embodiments, a shunt termination (T-switch) configuration is used for better off-isolation, and each of the symmetrical switches has its own translinear loop and thus flexibility of on-resistance and termination voltage.
    Type: Application
    Filed: October 21, 2015
    Publication date: June 30, 2016
    Inventors: Isaac Ko, Ka Wai Ho, Wan Tim Chan, Jimes Lei
  • Patent number: 8937565
    Abstract: An impedance matching transmission circuit for a transducer has a transmission medium connected to the transducer. A transmitting circuit is connected to the transmission medium with the transmitting circuit terminating in a reference circuit element. The transmitting circuit comprises an analog to digital converter having an analog input connected to the reference circuit element, and having a digital output. A digital to analog converter receives the digital output and generates an analog output signal in response thereto. A driver circuit is connected to the transmission medium and receives the analog output signal and supplies a driver signal to the transmission medium.
    Type: Grant
    Filed: August 22, 2012
    Date of Patent: January 20, 2015
    Assignee: Supertex, Inc.
    Inventors: Isaac Terasuth Ko, Ka Wai Ho, Wan Tim Chan
  • Publication number: 20120313485
    Abstract: An impedance matching transmission circuit for a transducer has a transmission medium connected to the transducer. A transmitting circuit is connected to the transmission medium with the transmitting circuit terminating in a reference circuit element. The transmitting circuit comprises an analog to digital converter having an analog input connected to the reference circuit element, and having a digital output. A digital to analog converter receives the digital output and generates an analog output signal in response thereto. A driver circuit is connected to the transmission medium and receives the analog output signal and supplies a driver signal to the transmission medium.
    Type: Application
    Filed: August 22, 2012
    Publication date: December 13, 2012
    Applicant: Supertex, Inc.
    Inventors: Isaac Terasuth KO, Ka Wai HO, Wan Tim CHAN
  • Patent number: 8269656
    Abstract: An impedance matching transmission circuit for a transducer has a transmission medium connected to the transducer. A transmitting circuit is connected to the transmission medium with the transmitting circuit terminating in a reference circuit element. The transmitting circuit comprises an analog to digital converter having an analog input connected to the reference circuit element, and having a digital output. A digital to analog converter receives the digital output and generates an analog output signal in response thereto. A driver circuit is connected to the transmission medium and receives the analog output signal and supplies a driver signal to the transmission medium.
    Type: Grant
    Filed: May 24, 2010
    Date of Patent: September 18, 2012
    Assignee: Supertex, Inc.
    Inventors: Isaac Terasuth Ko, Ka Wai Ho, Wan Tim Chan