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A sine-output ROM-less direct digital frequency synthesiser using a polynomial approximation
Author(s)
Meenakarn, C.
Thanachayanont, A.
Date Issued
July 14, 2003
Type
Conference Paper
Abstract
This paper describes the design and implementation of a ROM-less sine-output direct digital frequency synthesiser by using a polynomial approximation, which provides a maximum error less than 2e-4 for phase values between 0 to π/2. The full-period sinewave is generated by using a quadrant-decode technique. This yields a very high spectral purity sinewave output. System-level approximation and experimental results using an FPGA show that the maximum harmonic distortion is less than -67.4 dBc and -64.8 dBc respectively.
Citation
Proceedings IEEE International Symposium on Circuits and Systems, 1, I625-I628, 2003