Patents by Inventor Shahriar Mirabbasi

Shahriar Mirabbasi 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: 20230093490
    Abstract: A “frequency shifter” is a clock synthesis system, that includes either a multiplexer or a multi-modulus divider (MMD), a fractional frequency divider, a tunable delay element, a sawtooth signal generator, in addition to other synchronization and control circuits. The generated sawtooth signal is used to control the delay of the tunable delay element, which in turn is used to adjust the phase of the signal generated by either M-to-1 multiplexer or the MMD, reducing its timing errors, and improving the spectral purity of the generated clock signal.
    Type: Application
    Filed: February 23, 2021
    Publication date: March 23, 2023
    Inventors: Ahmad Sharkia, Sudip Shekhar, Shahriar Mirabbasi
  • Patent number: 10663358
    Abstract: A method of sensing a pressure applied to a surface comprises monitoring an electrical signal generated by redistribution of mobile ions in a piezoionic layer under the surface. An externally applied local pressure at a portion of the layer induces redistribution of mobile ions in the piezoionic layer. It is determined that the surface is pressured based on detection of the electrical signal. A piezoionic sensor includes a sensing surface; a piezoionic layer disposed under the sensing surface such that an externally applied local pressure on a portion of the sensing surface causes detectable redistribution of mobile ions in the piezoionic layer; and electrodes in contact with the layer, configured to monitor electrical signal generated by the redistribution of mobile ions in the piezoionic layer.
    Type: Grant
    Filed: March 4, 2016
    Date of Patent: May 26, 2020
    Assignee: The University of British Columbia
    Inventors: John Madden, Mirza Sarwar, Yuta Dobashi, Edmond Cretu, Shahriar Mirabbasi, Ettore Glitz, Meisam Farajollahi
  • Patent number: 10229564
    Abstract: An apparatus provides tactile stimulus to a human user using a tri-layer actuator comprising: first and second polymer layers which are electronically and ionically conductive and have one or more dimensions which vary in dependence on insertion of ions therein and withdrawal of ions therefrom; and a deformable layer located between the first and second polymer layers to physically separate the first and second polymer layers from one another, the deformable layer electronically insulating and ionically conductive. Application of first and second voltages between the first and second polymer layers creates corresponding first and second distributions of ions within the first and second polymer layers. Changing between application of the first and second voltages causes corresponding deformation of the tri-layer actuator between corresponding first and second shapes, a difference or transition between the first and second shapes detectable by a sense of touch of a human user.
    Type: Grant
    Filed: August 31, 2017
    Date of Patent: March 12, 2019
    Assignee: The University of British Columbia
    Inventors: Saeedeh Ebrahimi Takalloo, John D. W. Madden, Shahriar Mirabbasi, Meisam Farajollahi
  • Patent number: 10209537
    Abstract: A method and apparatus for monitoring and feedback control of a photonic switch such as 2×2 Mach-Zehnder Interferometer switch. Optical signals at an input and an output of the switch are monitored via optical taps. A sinusoidal time-varying phase shift is applied to one of the monitoring signals. An optical combiner then combines the monitoring signals. A photodetector monitors output of the optical combiner to provide a feedback signal. The amplitude of the feedback signal due to the time-varying phase shift increases with the amount of input signal present in the output signal. When the input signal is to be routed to the output (e.g. for a bar state), a controller manipulates the switch to maximize feedback signal amplitude. When the input signal is to be routed to a different output (e.g. for a cross state), the controller manipulates the switch to minimize feedback signal amplitude.
    Type: Grant
    Filed: September 9, 2016
    Date of Patent: February 19, 2019
    Assignee: Huawei Technologies Canada Co., Ltd.
    Inventors: Ray Chung, Zeqin Lu, Hasitha Jayatilleka, Mohammed Wadah Al Taha, Sudip Shekhar, Shahriar Mirabbasi, Lukas Chrostowski
  • Publication number: 20180191267
    Abstract: Embodiments include apparatuses, methods, and systems for an alternating current (AC) to direct current (DC) converter including a synchronous rectifier to convert an AC input signal to a DC output signal. The AC to DC converter may further include a feedback circuit coupled to an output terminal of the synchronous rectifier to sample the DC output signal and to generate a digital signal to represent a voltage of the DC output signal and a controller coupled to receive the digital signal from the feedback circuit. The controller may compare the digital signal to a threshold, and based on the comparison, control an adjustment of the voltage of the DC output signal. Additional embodiments may also be described.
    Type: Application
    Filed: January 3, 2017
    Publication date: July 5, 2018
    Inventors: Kamyar Keikhosravy, Shahriar Mirabbasi, David Harkness, Hamid Abdollahi
  • Publication number: 20180074386
    Abstract: A method and apparatus for monitoring and feedback control of a photonic switch such as 2×2 Mach-Zehnder Interferometer switch. Optical signals at an input and an output of the switch are monitored via optical taps. A sinusoidal time-varying phase shift is applied to one of the monitoring signals. An optical combiner then combines the monitoring signals. A photodetector monitors output of the optical combiner to provide a feedback signal. The amplitude of the feedback signal due to the time-varying phase shift increases with the amount of input signal present in the output signal. When the input signal is to be routed to the output (e.g. for a bar state), a controller manipulates the switch to maximize feedback signal amplitude. When the input signal is to be routed to a different output (e.g. for a cross state), the controller manipulates the switch to minimize feedback signal amplitude.
    Type: Application
    Filed: September 9, 2016
    Publication date: March 15, 2018
    Applicant: Huawei Technologies Canada Co., Ltd.
    Inventors: Ray CHUNG, Zeqin LU, Hasitha JAYATILLEKA, Mohammed Wadah ALTAHA, Sudip SHEKHAR, Shahriar MIRABBASI, Lukas CHROSTOWSKI
  • Publication number: 20180053386
    Abstract: An apparatus provides tactile stimulus to a human user using a tri-layer actuator comprising: first and second polymer layers which are electronically and ionically conductive and have one or more dimensions which vary in dependence on insertion of ions therein and withdrawal of ions therefrom; and a deformable layer located between the first and second polymer layers to physically separate the first and second polymer layers from one another, the deformable layer electronically insulating and ionically conductive. Application of first and second voltages between the first and second polymer layers creates corresponding first and second distributions of ions within the first and second polymer layers. Changing between application of the first and second voltages causes corresponding deformation of the tri-layer actuator between corresponding first and second shapes, a difference or transition between the first and second shapes detectable by a sense of touch of a human user.
    Type: Application
    Filed: August 31, 2017
    Publication date: February 22, 2018
    Inventors: Saeedeh EBRAHIMI TAKALLOO, John D.W. MADDEN, Shahriar MIRABBASI, Meisam FARAJOLLAHI
  • Publication number: 20180038745
    Abstract: A method of sensing a pressure applied to a surface comprises monitoring an electrical signal generated by redistribution of mobile ions in a piezoionic layer under the surface. An externally applied local pressure at a portion of the layer induces redistribution of mobile ions in the piezoionic layer. It is determined that the surface is pressured based on detection of the electrical signal. A piezoionic sensor includes a sensing surface; a piezoionic layer disposed under the sensing surface such that an externally applied local pressure on a portion of the sensing surface causes detectable redistribution of mobile ions in the piezoionic layer; and electrodes in contact with the layer, configured to monitor electrical signal generated by the redistribution of mobile ions in the piezoionic layer.
    Type: Application
    Filed: March 4, 2016
    Publication date: February 8, 2018
    Inventors: John Madden, Mirza Sarwar, Yuta Dobashi, Edmond Cretu, Shahriar Mirabbasi, Ettore Glitz, Meisam Farajollahi