Browsing by Author "Maundy, Brent J."
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Item Open Access A novel four-quadrant CMOS analog multiplier/divider(2004) Li, Gang; Maundy, Brent J.Item Open Access Design and Implementation of a Magnitude Only Bio-Impedance Analyzer(2018-04-18) Al-Ali, Abdulwadood Abdullah Abdulwadood; Maundy, Brent J.; Murari, Kartikeya; Mintchev, Martin P.The increasing interest in the bio-impedance analysis in various fields has increased the demand for portable and low-cost impedance analyzers that can be used in the field. Simplifying the hardware is crucial to maintaining low-cost and portability, but this is not an easy task due to the need for accurate phase and magnitude measurements. This thesis proposes a new measurement technique that replaces the need to measure the phase by using a software algorithm to extract the phase from the magnitude information. The algorithm which is based on a modified Kramers-Kronig transforms was implemented and tested first using MATLAB, where error and noise analysis on the algorithm were done. Furthermore, the algorithm was written using a python code, and a full Bio-impedance measurement system was proposed to be used for fruit quality control which is receiving increasing attention as an important application of bio-impedance measurements, for being a non-invasive technique. The Final design which was implemented on a printed circuit board (PCB), had a final cost of around $95 CAD and drew a maximum current of around 88mA which satisfies the requirement of a low-cost and low-power device respectively. The device was then tested with passive components and several fruit samples to show that it can effectively monitor fruit samples impedance in the range 100 Ohm-280 kOhm, and a frequency range 1 Hz-10 MHz which is higher than any other work in the literature. The proposed portable bio-impedance analyzers were then used to study the ageing effect of some strawberries samples on their bio-impedance, and the results showed that the device could be used in such an application.Item Open Access Design and Implementation of Fractional Step Filters(2010) Freeborn, Todd; Maundy, Brent J.Item Open Access Design of low voltage operational transconductance amplifiers for analog applications(2001) Majumdar, Deyasini; Maundy, Brent J.Item Open Access Differential threshold reliant detectors for ternary partial response channels(2003) Omole, Ibiyemi Akintomide; Maundy, Brent J.Item Open Access Fuzzy Logic Controller for Frequency Regulation of a Hydro and Wind Based Isolated Hybrid Micro-grid(2018-04-13) Pal, Suvajit; Malik, Om P.; Wood, David H.; Maundy, Brent J.Operation of an isolated hybrid micro-grid requires a system to be capable of regulating the system frequency as well as the voltage. The operation of a hydro power plant combined with a wind power plant and a solar power plant is analyzed in this thesis. The main balancing mechanism of the proposed hybrid micro-grid is the hydro power plant. Speed governor of hydro power plant and wind pitch controller of wind power plant are implemented using both conventional PI and Fuzzy logic based controllers. A supervisory controller, that will supervise individual controllers and determine the desired power generation of hydro and wind power generating units, is also proposed. By monitoring the system frequency, voltage and active power of various power generating units under various operating conditions, it is concluded that the proposed control scheme provides reliable system frequency and voltage regulation, and energy management.Item Open Access High quality factor asymmetric-slope band-pass filters(2011) Ahmadi, Peyman; Maundy, Brent J.; Belostotski, LeonidItem Open Access High speed chaos based SS transceiver design for wideband communication(2009) Majumdar, Deyasini; Leung, Henry; Maundy, Brent J.Item Open Access LNA and mixer designs for RF front-ends(2007) Salmeh, Roghoyeh; Maundy, Brent J.; Johnston, Ronald H.Item Open Access Non-linear digital-to-analog converters for low voltage (3.3v/1.8v) applications(2011) Purighalla, Sandhya; Maundy, Brent J.Item Open Access Novel design approaches for low-voltage CMOS current feedback and transconductance feedback amplifiers(2004) Sarkar, Ataur Rahman; Maundy, Brent J.Item Open Access Quality factor tuning of continuous time lowpass filters using a modified LMS algorithm(2002) Salmeh, Roghoyeh; Maundy, Brent J.Item Open Access Time-based serial communication links(2011) Rashdan, Mostafa Salah Abd Elhakeem; Maundy, Brent J.; Haslett, James W.