| US 7,577,695 B2 | ||
| High-order delta-sigma noise shaping in direct digital frequency synthesis | ||
| Fa Dai, Auburn, Ala. (US) | ||
| Assigned to Auburn University, Auburn, Ala. (US) | ||
| Filed on Jul. 22, 2005, as Appl. No. 11/187,365. | ||
| Claims priority of provisional application 60/590287, filed on Jul. 22, 2004. | ||
| Prior Publication US 2006/0020649 A1, Jan. 26, 2006 | ||
| Int. Cl. G06F 1/02 (2006.01) | ||
| U.S. Cl. 708—271 | 22 Claims |
| 1. A direct digital synthesis (DDS) circuit for removing phase quantization and truncation errors from a phase word received
from a phase accumulator, the DDS circuit comprising:
a) a phase word truncator, wherein the phase word truncator truncates the phase word and outputs a phase error;
b) a delta-sigma noise shaper configured to remove the phase error from the phase word; and
c) a look-up table configured to output a sin amplitude word and a cosine amplitude word corresponding to the phase word.
|