Extremely High Frequency Resolution and Low Harmonic Distortion Digital Look-Up-Table Sinusoidal Oscillators
New techniques to efficiently increase the frequency resolution of digital sinusoidal oscillators based on look-up-table (LUT) methods are proposed. The increase in frequency resolution is achieved while maintaining very low level of spurious harmonic distortion. The proposed techniques increase the...
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| Main Author: | |
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| Format: | Article |
| Language: | English |
| Published: |
Wiley
2000-01-01
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| Series: | Active and Passive Electronic Components |
| Online Access: | http://dx.doi.org/10.1155/APEC.23.101 |
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| Summary: | New techniques to efficiently increase the frequency resolution of digital sinusoidal
oscillators based on look-up-table (LUT) methods are proposed. The increase in frequency
resolution is achieved while maintaining very low level of spurious harmonic
distortion. The proposed techniques increase the LUT length to a level at which the
spurious harmonic distortion is negligible. The first proposed technique is based on
partitioning the address register into three sets and dividing the available LUT length
into three smaller tables addressed according to the content of the address register sets.
The second proposed technique utilizes one LUT and interpolates the values of the
samples that are not stored in the table. The third proposed technique is similar to the
first technique with the advantage of simpler implementation and lower levels of
spurious harmonic distortion. The proposed techniques are simulated and their performance
is compared with that of the direct LUT and trigonometric interpolation
methods. The simulation results show that the proposed techniques are superior to both
direct LUT and trigonometric interpolation methods. |
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| ISSN: | 0882-7516 1563-5031 |