Gaussian pulse generator circuit for UWB systems by discrete switches and integrated circuit

  • Author / Creator
    Mahdi Alesheikh
  • A Gaussian pulse generator circuit is a component of an ultra-wideband transceiver
    (transmitter and receiver) circuit that generates a narrow pulse for imaging,
    detecting, and various other applications. In UWB transceivers Gaussian pulse is
    always converted to a Monopulse to be DC-free and more compatible for
    transmission via an antenna. This Monopulse is created using Avalanche transistors
    as discrete switches and a differential CMOS transistor in 65 nm technology as an
    integrated circuit. Discrete switches generate high amplitude voltage with a
    moderate pulse width, improving the detection range in UWB transceivers.
    However, using a 65 nm integrated circuit (IC) instead of a discrete circuit can
    capture a sharper pulse with less pulse width, increasing the range resolution. The
    first design is consists of three-stage Avalanche transistors, to increase the
    amplitude of Gaussian pulse by a factor of three. The final Monopulse is created by
    a balun that subtracted two Gaussian pulses, which have different phases. In this
    design, the final Monopulse is connected to the antenna and sent by the transmitter
    circuit. After receiving the transmitted signal and analyzing the data by the
    computer, the buried object in 45 cm depth is detected and separated from the sand.
    The second design consists of a differential pair circuit that generates a sharp pulse
    due to the voltage difference between its two inputs. The desired Monopulse is
    formed by sharpening this pulse using an inverter chain and mixing three pulses
    with different phases. These Gaussian pulse generator systems can be utilized in
    different applications, such as detecting buried objects, underwater imaging, through-wall imaging, diagnosing cancer glands without using harmful methods
    like an X-ray beam, etc.

  • Subjects / Keywords
  • Graduation date
    Fall 2021
  • Type of Item
  • Degree
    Master of Science
  • DOI
  • License
    This thesis is made available by the University of Alberta Libraries with permission of the copyright owner solely for non-commercial purposes. This thesis, or any portion thereof, may not otherwise be copied or reproduced without the written consent of the copyright owner, except to the extent permitted by Canadian copyright law.