A ROM-less direct digital frequency synthesiser using a polynomial approximation

Meenakarn, C.; Thanachayanont, A.

doi:10.1109/VTSA.2003.1252612

A ROM-less direct digital frequency synthesiser using a polynomial approximation

Author(s)

Meenakarn, C.

Thanachayanont, A.

Date Issued

January 1, 2003

Type

Conference Paper

DOI

10.1109/VTSA.2003.1252612

Abstract

This paper describes the design and implementation of a sine-output ROM-less direct digital frequency synthesiser by using a polynomial approximation of which a maximum error less than 2e-4 can be achieved 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

International Symposium on VLSI Technology Systems and Applications Proceedings, 2003-January, 296-299, 2003