Title :
Piece-wise parabolic interpolation for direct digital frequency synthesis
Author :
Eltawil, Ahmed M. ; Daneshrad, Babak
Author_Institution :
Electr. Eng. Dept., Univ. of California, Los Angeles, CA, USA
Abstract :
In this paper, a compact architecture and implementation for direct digital frequency synthesis (DDFS) is presented. It uses a smaller lookup table for sinusoidal functions compared to existing architectures. The computation of the sinusoidal values is performed by a parabolic interpolation structure, thus only interpolation coefficients need to be stored in the read-only memory (ROM). The ROM size is consistently less than 1 Kbit for SFDR values up to 85 dBc.
Keywords :
direct digital synthesis; interpolation; piecewise linear techniques; read-only storage; table lookup; DDFS; ROM size; SFDR values; direct digital frequency synthesis; lookup table; piece-wise parabolic interpolation; sinusoidal functions; Buildings; Clocks; Computer architecture; Equations; Filters; Frequency synthesizers; Interpolation; Laboratories; Read only memory; Table lookup;
Conference_Titel :
Custom Integrated Circuits Conference, 2002. Proceedings of the IEEE 2002
Print_ISBN :
0-7803-7250-6
DOI :
10.1109/CICC.2002.1012856
