- 182 views
- 214 downloads
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.
- Graduation date
- Fall 2021
- Type of Item
- Master of Science
- 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.