Electronic and Communication - Engineering

Abstract : The aim of this thesis is to design and implement Digital Down Converter (DDC) using Field Programmable Gate Array (FPGA) chip for input sampling frequency of 40 MHz and 25 KHz channel bandwidth. The Xilinx FPGA is chosen here with Virtex-II device to achieve this task for the DDC system implementation. The individual components of the DDC system are the mixer with its adder/subtractor and multiplier, Numerical Controlled Oscillator (NCO), and decimation filter. These components are software implemented using VHDL language, with the software called ModelSim version SE-EE 5.4a.

Abstract : Emulating of electronic devices and circuits is an essential matter for the analysis and design of the analog/digital circuits. The accuracy of the emulating processes depends mainly on the accuracy of the models for the semiconductor devices forming the electronic circuits. One of these electronic devices is the MOSFET transistor that represents the most popular electronic device used in the analog and/ or digital circuits, and for this reason it has been chosen in this work.

Abstract : This research investigates the application of the discrete wavelet transform (DWT) to the problem of denoising flow signals. The flow signals were made available, for this work, from the records generated by single particle flowing in an experimental system, where each record has 256 data points sampled at a rate of 2000 sps. The measuring technique uses the space-periodic capacitance transducer (SPCT) which generates flow signals with a spectral content which depends on the velocity of the flowing particle above the transducer (SPCT).