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

Author

Meenakarn, C. ; Thanachayanont, A.

Author_Institution

Fac. of Eng., King Mongkut´´s Inst. of Technol., Bangkok, Thailand

fYear

2003

fDate

2003

Firstpage

296

Lastpage

299

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.

Keywords

circuit simulation; direct digital synthesis; field programmable gate arrays; harmonic distortion; polynomial approximation; waveform generators; FPGA; ROM less direct digital frequency synthesiser; full-period sinewave generation; harmonic distortion; high spectral purity sinewave output; polynomial approximation; quadrant decode technique; system level approximation; Computer errors; Design engineering; Digital integrated circuits; Frequency control; Frequency synthesizers; Harmonic distortion; Information technology; Integrated circuit synthesis; Polynomials; Read only memory;

fLanguage

English

Publisher

ieee

Conference_Titel

VLSI Technology, Systems, and Applications, 2003 International Symposium on

ISSN

1524-766X

Print_ISBN

0-7803-7765-6

Type

conf

DOI

10.1109/VTSA.2003.1252612

Filename

1252612