Direct digital frequency synthesis

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2000-01-01
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D'Souza, Lewelyn
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Electrical and Computer Engineering

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.

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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.

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1909-present

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  • Department of Electrical Engineering (1909-1985)
  • Department of Electrical Engineering and Computer Engineering (1985-1995)

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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.

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Sat Jan 01 00:00:00 UTC 2000