Direct digital frequency synthesis
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The Department of Electrical and Computer Engineering (ECpE) contains two focuses. The focus on Electrical Engineering teaches students in the fields of control systems, electromagnetics and non-destructive evaluation, microelectronics, electric power & energy systems, and the like. The Computer Engineering focus teaches in the fields of software systems, embedded systems, networking, information security, computer architecture, etc.
History
The Department of Electrical Engineering was formed in 1909 from the division of the Department of Physics and Electrical Engineering. In 1985 its name changed to Department of Electrical Engineering and Computer Engineering. In 1995 it became the Department of Electrical and Computer Engineering.
Dates of Existence
1909-present
Historical Names
- Department of Electrical Engineering (1909-1985)
- Department of Electrical Engineering and Computer Engineering (1985-1995)
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- College of Engineering (parent college)
- Department of Physics and Electrical Engineering (predecessor)
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Abstract
In this thesis, a method of Direct Digital Frequency Synthesis, which uses a Non Linear DAC in place of a ROM look up table, is studied. The objective of this work is to explore the spurious performance of the ROM-less DDFS at high frequencies. Replacing the ROM by a non linear DAC has the potential to give similar performance with lower power dissipation and silicon area. An upper limit to this performance comes from the difficulty in designing an accurate high resolution DAC, and the spurious frequencies produced at the output due to quantization effects in the phase and amplitude word lengths. Various techniques at every level are described to reduce the output spurs by randomization, as well as analog matching performance of the DAC. Simulations indicate a spurious performance of over 77DB may be achieved for frequencies close to 125MHz.