Patents by Inventor Mau-Chung Frank Chang

Mau-Chung Frank Chang 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: 11521051
    Abstract: A neural network computing engine having an array of charge-trap-transistor (CTT) elements which are utilized as analog multipliers with all weight values preprogrammed into each CTT element as a CTT threshold voltage, with multiplicator values received from the neural network inference mode. The CTT elements perform computations of a fully connected (FC) neural network with each CTT element representing a neuron. Row resistors for each row of CTT element sum output currents as partial summation results. Counted pulse generators write weight values under control of a pulse generator controller. A sequential analog fabric (SAF) feeds multiple drain voltages in parallel to the CTT array to enable parallel analog computations of neurons. Partial summation results are read by an analog-to-digital converter (ADC).
    Type: Grant
    Filed: May 17, 2020
    Date of Patent: December 6, 2022
    Assignee: THE REGENTS OF THE UNIVERSITY OF CALIFORNIA
    Inventors: Mau-Chung Frank Chang, Yuan Du, Li Du
  • Patent number: 11483027
    Abstract: We have demonstrated that the bandwidth millimeter wavelengths offer can be leveraged to deeply spread a low-data rate signal below the thermal floor of the environment (sub-thermal) by lowered transmit power combined with free space losses, while still being successfully received through a novel dispreading structure which does not rely on pre-detection to extract timing information. The demonstrated data link ensures that it cannot be detected beyond a designed range from the transmitter, while still providing reliable communication. A demonstration chipset of this sub-thermal concept was implemented in a 28 nm CMOS technology and when combined with an InP receiver was shown to decode signals up to 30 dB below the thermal noise floor by spreading a 9600 bps signal over 1 GHz of RF bandwidth from 93 to 94 GHz using a 64 bit spreading code. The transmitter for this chipset consumed 62 mW while the receiver consumed 281 mw.
    Type: Grant
    Filed: December 18, 2020
    Date of Patent: October 25, 2022
    Assignees: CALIFORNIA INSTITUTE OF TECHNOLOGY, THE REGENTS OF THE UNIVERSITY OF CALIFORNIA
    Inventors: Adrian J. Tang, Mau-Chung Frank Chang, Rulin Huang
  • Patent number: 11271109
    Abstract: A silicon metal-oxide-semiconductor field effect transistor with a wide-bandgap III-V compound semiconductor drain and a method for fabricating the same are disclosed. The method fabricates a hundred nanometer-scale hole in a (100) silicon substrate to expose the (111) facet of the silicon substrate, which favors to use selective area growth to form lattice matched III-V materials with high quality.
    Type: Grant
    Filed: August 31, 2020
    Date of Patent: March 8, 2022
    Assignee: National Chiao Tung University
    Inventors: Edward Yi Chang, Mau-Chung Frank Chang, Chieh-Hsi Chuang, Jessie Lin
  • Patent number: 11175822
    Abstract: A low-cost single-layer mobile touch-screen is disclosed, including a highly sensitive capacitive sensing circuit, and a corresponding finger 3D position estimation and gesture recognition algorithms compatible with mobile device platforms and that can be readily programmed into the mobile device's application processor.
    Type: Grant
    Filed: November 8, 2018
    Date of Patent: November 16, 2021
    Assignee: THE REGENTS OF THE UNIVERSITY OF CALIFORNIA
    Inventors: Mau-Chung Frank Chang, Li Du, Chunchen Liu, Yan Zhang
  • Publication number: 20210194535
    Abstract: We have demonstrated that the bandwidth millimeter wavelengths offer can be leveraged to deeply spread a low-data rate signal below the thermal floor of the environment (sub-thermal) by lowered transmit power combined with free space losses, while still being successfully received through a novel dispreading structure which does not rely on pre-detection to extract timing information. The demonstrated data link ensures that it cannot be detected beyond a designed range from the transmitter, while still providing reliable communication. A demonstration chipset of this sub-thermal concept was implemented in a 28 nm CMOS technology and when combined with an InP receiver was shown to decode signals up to 30 dB below the thermal noise floor by spreading a 9600 bps signal over 1 GHz of RF bandwidth from 93 to 94 GHz using a 64 bit spreading code. The transmitter for this chipset consumed 62 mW while the receiver consumed 281 mw.
    Type: Application
    Filed: December 18, 2020
    Publication date: June 24, 2021
    Applicants: California Institute of Technology, The Regents of the University of California
    Inventors: Adrian J. Tang, Mau-Chung Frank Chang, Rulin Huang
  • Publication number: 20210159338
    Abstract: A silicon metal-oxide-semiconductor field effect transistor with a wide-bandgap III-V compound semiconductor drain and a method for fabricating the same are disclosed. The method fabricates a hundred nanometer-scale hole in a (100) silicon substrate to expose the (111) facet of the silicon substrate, which favors to use selective area growth to form lattice matched III-V materials with high quality.
    Type: Application
    Filed: August 31, 2020
    Publication date: May 27, 2021
    Inventors: EDWARD YI CHANG, MAU-CHUNG FRANK CHANG, CHIEH-HSI CHUANG, JESSIE LIN
  • Publication number: 20210042610
    Abstract: A system and method for computing a sparse neural network having a plurality of output layers, each of which has a neuron value. Processing engines (PEs) each have a local memory for storing neurons for use with different weight values in a following cycle. A multiplexer selects between the input neuron or the output of the memory. Output from the multiplexor is received along with a weight input to a multiplier whose output is directed to an integrator. A decomposition technique performs a network computation through the use of intermediate neurons when the input neuron is larger than the local memory capacity, and provides data reuse by reusing neurons stored in local memory. Neural systems can be implemented using a neural index to address each of multiple PEs and a parallel-serial first-in-first-out (FIFO) to serially store values in main memory.
    Type: Application
    Filed: August 17, 2020
    Publication date: February 11, 2021
    Applicant: THE REGENTS OF THE UNIVERSITY OF CALIFORNIA
    Inventors: Mau-Chung Frank Chang, Li Du, Yuan Du
  • Patent number: 10850842
    Abstract: An unmanned aerial vehicle (UAV) includes a body, a plurality of rotated propulsion systems, and at least one air bag. The rotated propulsion systems are connected to the body and each includes a blade and an actuator configured to actuate the blade. The air bag is disposed on the body.
    Type: Grant
    Filed: July 4, 2018
    Date of Patent: December 1, 2020
    Assignee: NATIONAL CHIAO TUNG UNIVERSITY
    Inventors: Mau-Chung Frank Chang, Chiun-Hsun Chen
  • Publication number: 20200364548
    Abstract: A neural network computing engine having an array of charge-trap-transistor (CTT) elements which are utilized as analog multipliers with all weight values preprogrammed into each CTT element as a CTT threshold voltage, with multiplicator values received from the neural network inference mode. The CTT elements perform computations of a fully connected (FC) neural network with each CTT element representing a neuron. Row resistors for each row of CTT element sum output currents as partial summation results. Counted pulse generators write weight values under control of a pulse generator controller. A sequential analog fabric (SAF) feeds multiple drain voltages in parallel to the CTT array to enable parallel analog computations of neurons. Partial summation results are read by an analog-to-digital converter (ADC).
    Type: Application
    Filed: May 17, 2020
    Publication date: November 19, 2020
    Applicant: THE REGENTS OF THE UNIVERSITY OF CALIFORNIA
    Inventors: Mau-Chung Frank Chang, Yuan Du, Li Du
  • Patent number: 10763587
    Abstract: A system, apparatus and method are disclosed for communicating between a short range wireless (WLAN) user device, such as a wearable, phone, or tablet, with a base station. Traditional low power communication (e.g., WLAN, WiFi, Bluetooth, cellular links, etc.) involve an inefficient amplification process of a signal from the WLAN user to the base station, whereby significant power must be expended in the WLAN user device making it unsuitable in many applications. A reflector link paradigm is disclosed in which the user device communicates by modulating the extent of signal reflected back to the base station. An enhanced reflector is also disclosed which overcomes adverse effects of ambient reflections.
    Type: Grant
    Filed: January 16, 2017
    Date of Patent: September 1, 2020
    Assignees: THE REGENTS OF THE UNIVERSITY OF CALIFORNIA, CALIFORNIA INSTITUTE OF TECHNOLOGY
    Inventors: Mau-Chung Frank Chang, Yanghyo Kim, Adrian Tang, Nacer Chahat
  • Publication number: 20200150032
    Abstract: An imaging device and method for evaluating and/or imaging material or chemical constituents of a sample. In one configuration, the imaging device includes a scanner having a terahertz wave transmitter configured to determine the amount of superabsorbent polymer (SAP) in the core of disposable hygiene product such as baby diapers, adult diapers and feminine hygiene pads, during the fabrication process.
    Type: Application
    Filed: October 29, 2019
    Publication date: May 14, 2020
    Applicant: THE REGENTS OF THE UNIVERSITY OF CALIFORNIA
    Inventors: Mau-Chung Frank Chang, Richard Al Hadi, Yan Zhao
  • Patent number: 10505781
    Abstract: A backscatter modulator for providing low power wireless communications. The disclosed modulator provides phase control for discriminating backscatter from the antenna versus other objects. In addition, the disclosed backscatter modulator provides amplitude modulation so that the technique can provide a non-constant envelope which can provide an intentional imbalance to manipulate super-position to provide envelope control of the reflected signal, while still maintaining the frequency translation properties. The disclosed backscatter modulator thus allows compatibility with QAM, OFDM and other non-constant envelope modulation schemes to be backscattered, while still supporting the frequency translation behavior.
    Type: Grant
    Filed: November 9, 2018
    Date of Patent: December 10, 2019
    Assignees: THE REGENTS OF THE UNIVERSITY OF CALIFORNIA, CALIFORNIA INSTITUTE OF TECHNOLOGY
    Inventors: Mau-Chung Frank Chang, Adrian J. Tang
  • Publication number: 20190173728
    Abstract: A backscatter modulator for providing low power wireless communications. The disclosed modulator provides phase control for discriminating backscatter from the antenna versus other objects. In addition, the disclosed backscatter modulator provides amplitude modulation so that the technique can provide a non-constant envelope which can provide an intentional imbalance to manipulate super-position to provide envelope control of the reflected signal, while still maintaining the frequency translation properties. The disclosed backscatter modulator thus allows compatibility with QAM, OFDM and other non-constant envelope modulation schemes to be backscattered, while still supporting the frequency translation behavior.
    Type: Application
    Filed: November 9, 2018
    Publication date: June 6, 2019
    Applicants: THE REGENTS OF THE UNIVERSITY OF CALIFORNIA, CALIFORNIA INSTITUTE OF TECHNOLOGY
    Inventors: Mau-Chung Frank Chang, Adrian J. Tang
  • Patent number: 10305606
    Abstract: Communication between a wireless base-station and a microwave reflector link are enhanced by feeding back a portion of the transmitter signal, adjusted for phase and amplitude, to cancel ambient reflection blocker signals being received at the base-station. The microwave reflector link does not utilize a transmitter gain stage, but communicates data back to the base-station in response to modulating the reflections of its antenna (e.g., in gain and/or phase). The disclosure aids in the proper amplification and processing of reflection signals from the microwave reflector link, by canceling out the blocking signals which arise as background objects reflect transmitter signal energy back to the base-station.
    Type: Grant
    Filed: April 18, 2017
    Date of Patent: May 28, 2019
    Assignees: THE REGENTS OF THE UNIVERSITY OF CALIFORNIA, CALIFORNIA INSTITUTE OF TECHNOLOGY
    Inventors: Mau-Chung Frank Chang, Yanghyo Kim, Adrian J. Tang
  • Publication number: 20190146609
    Abstract: A low-cost single-layer mobile touch-screen is disclosed, including a highly sensitive capacitive sensing circuit, and a corresponding finger 3D position estimation and gesture recognition algorithms compatible with mobile device platforms and that can be readily programmed into the mobile device's application processor.
    Type: Application
    Filed: November 8, 2018
    Publication date: May 16, 2019
    Applicant: THE REGENTS OF THE UNIVERSITY OF CALIFORNIA
    Inventors: Mau-Chung Frank Chang, Li Du, Chunchen Liu, Yan Zhang
  • Publication number: 20190016461
    Abstract: An unmanned aerial vehicle (UAV) includes a body, a plurality of rotated propulsion systems, and at least one air bag. The rotated propulsion systems are connected to the body and each includes a blade and an actuator configured to actuate the blade. The air bag is disposed on the body.
    Type: Application
    Filed: July 4, 2018
    Publication date: January 17, 2019
    Inventors: Mau-Chung Frank CHANG, Chiun-Hsun CHEN
  • Patent number: 10108300
    Abstract: Non-contact position and motion sensing is improved for oscillator frequency based sensors in response to adding a two phase calibration along with bootstrapping circuit. Calibration is performed across the multiple sensor channels, so that: (1) maximum sensor channel loading is determined, and (2) the amount of capacitive load required for each other channel to match this same maximum load is stored for application to that channel during non-contact sensing. Capacitive coupling between channels is nullified by a bootstrapping process, in which time-domain voltage on the active channel is replicated on the non-active channels during non-contact sensing, thus creating equal potentials across inter-channel couplings that effectively eliminate inter-channel capacitive loading.
    Type: Grant
    Filed: September 12, 2016
    Date of Patent: October 23, 2018
    Assignee: THE REGENTS OF THE UNIVERSITY OF CALIFORNIA
    Inventors: Adrian J. Tang, Mau-Chung Frank Chang
  • Patent number: 10027362
    Abstract: A wireless wearable high data throughput (big data) brain machine interface apparatus is presented. An implanted recording and transmitting module collects neural data from a plurality of implanted electrodes and wirelessly transmits this over a short distance to a wearable (not implanted) receiving and forwarding module, which communicates the data over a wired communication to a mobile post processing device. The post processing device can send this neural data to an external display or computer enabled device for viewing and/or manipulation. High data throughput is supported by aggregating multiple groups of electrodes by multiple n-channel recording elements, which are multiplexed and then modulated into high frequency wireless communications to the wearable module. Embodiments include use of multiple radiators (multiple polarizations and/or spatially distributed), with beam alignment adjustment.
    Type: Grant
    Filed: June 8, 2016
    Date of Patent: July 17, 2018
    Assignee: THE REGENTS OF THE UNIVERSITY OF CALIFORNIA
    Inventors: Wentai Liu, Mau-Chung Frank Chang, Yen-Cheng Kuan, Yi-Kai Lo, Yan Zhao
  • Patent number: 9917342
    Abstract: A wave cable transceiver system is disclosed incorporating an air-core or noble gas filled hollow plastic waveguide. The system may include a transmitter receiver, in-antennas and a tubular plastic waveguide with the inner air-core. The hollow plastic waveguide is a low loss and low dispersion guiding channel for the electromagnetic radiation.
    Type: Grant
    Filed: September 10, 2015
    Date of Patent: March 13, 2018
    Assignee: THE REGENTS OF THE UNIVERSITY OF CALIFORNIA
    Inventors: Mau-Chung Frank Chang, Lan Nan, Yanghyo Kim
  • Publication number: 20170288787
    Abstract: Communication between a wireless base-station and a microwave reflector link are enhanced by feeding back a portion of the transmitter signal, adjusted for phase and amplitude, to cancel ambient reflection blocker signals being received at the base-station. The microwave reflector link does not utilize a transmitter gain stage, but communicates data back to the base-station in response to modulating the reflections of its antenna (e.g., in gain and/or phase). The disclosure aids in the proper amplification and processing of reflection signals from the microwave reflector link, by canceling out the blocking signals which arise as background objects reflect transmitter signal energy back to the base-station.
    Type: Application
    Filed: April 18, 2017
    Publication date: October 5, 2017
    Applicants: THE REGENTS OF THE UNIVERSITY OF CALIFORNIA, CALIFORNIA INSTITUTE OF TECHNOLOGY
    Inventors: Mau-Chung Frank Chang, Yanghyo Kim, Adrian J. Tang