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

  • Gaussian pulse
  • transmitter

• Graduation date

  Fall 2021

• Type of Item

  Thesis

• Degree

  Master of Science

• DOI

  https://doi.org/10.7939/r3-c54t-fd37

• 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.