A modified low roundoff digital oscillator design

Date of Award


Publication Type

Master Thesis

Degree Name



Electrical and Computer Engineering

First Advisor

Kwan, Hon (Electrical & Computer Engineering)


Engineering, Electronics and Electrical.



Creative Commons License

Creative Commons Attribution-Noncommercial-No Derivative Works 4.0 License
This work is licensed under a Creative Commons Attribution-Noncommercial-No Derivative Works 4.0 License.


The work of this thesis is to summarize and compares the existing digital oscillator design methods and combine them to form a modified structure for oscillator design. First of all, a combined structure of complex oscillator design is proposed. The structure combines the advantages of low hardware complexity and low roundoff errors. Then based on the suggested complex oscillator structure, some new digital oscillator structures with uniform frequency spacing are suggested. The new structures are also the modified structure of the existing oscillator. By adding power-of-two shift boxes into the modified structure, dynamic range of the output is enlarged and the quantization errors are greatly reduced. The modified oscillators can generate low frequency and low amplitude sinusoid waves with very small phase and amplitude deviation. In order to further reduce the quantization errors, error feedback circuits is applied into the circuit to further reduce the errors.

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