in May 2006, I graduated with a Bachelor's Degree in Electrical Engineering at the University of Maine at Orono. Before obtaining an Associate's Degree in Electronics Technology at the Southern Maine Community College in 2001, I studied one semester at Cork Institute of Technology, Cork, Ireland on a George J. Mitchell Peace Scholarship Exchange Program. I have attended the Thornton Academy High School in Saco, Maine, USA and Gimnazija High School in Banja Luka, Republic of Srpska, Bosnia and Herzegovina.

Direct Digital Synthesizer Design

My Direct Digital Synthesizer IC design has been created and submitted for fabrication on a 1.5mm x 1.5mm silicon chip. This project meets requirements of ECE547 VLSI Design / Layout class where I have performed my own CMOS transistor level design, simulation, partial custom chip layout, complete verification, and parasitic extraction.

What does the chip do?
 
Direct Digital Synthesizer (DDS) produces a sine wave – by generating a time-varying signal in digital form and then performing a digital-to-analog conversion. Because operations within a DDS are primarily digital, it can offer fast switching between output frequencies, fine frequency resolution and operation over a broad spectrum of frequencies.

Multi-mode, Amplitude Modulated (AM), Radio Frequency (RF) Transmitter

The project with its functional block diagram shown below was designed to meet the requirements specified by the senior capstone course in electrical engineering (ECE 401 – 403) at the University of Maine at Orono.

This project is a multi-mode, Amplitude Modulated (AM), Radio Frequency (RF) transmitter. The modes of operation include Dual Sideband Full Carrier (DSB-FC) and Dual Sideband Suppressed Carrier (DSB-SC). The carrier frequency is fixed at 2.45 MHz; a Gilbert Cell (four quadrant multiplier) is used to perform the modulation function and Class-A and Class-C amplifiers, along with a simple dipole antenna, are used to amplify and transmit the output of the Gilbert Cell. A maximum range of 150ft was reached with the Class-C. This project is subject to, and complies with, FCC rules for unlicensed broadcast.