Title :
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
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;
Conference_Titel :
VLSI Technology, Systems, and Applications, 2003 International Symposium on
Print_ISBN :
0-7803-7765-6
DOI :
10.1109/VTSA.2003.1252612
