title: A ROM-less direct digital frequency synthesizer based on hybrid polynomial approximation.
abstract: In this paper, a novel design approach for a phase to sinusoid amplitude converter (PSAC) has been investigated. Two segments have been used to approximate the first sine quadrant. A first linear segment is used to fit the region near the zero point, while a second fourth-order parabolic segment is used to approximate the rest of the sine curve. The phase sample, where the polynomial changed, was chosen in such a way as to achieve the maximum spurious free dynamic range (SFDR). The invented direct digital frequency synthesizer (DDFS) has been encoded in VHDL and post simulation was carried out. The synthesized architecture exhibits a promising result of 90 dBc SFDR. The targeted structure is expected to show advantages for perceptible reduction of hardware resources and power consumption as well as high clock speeds.
authors.affiliation: Department of Electrical, Electronic and Systems Engineering, Faculty of Engineering & Built Environment, Universiti Kebangsaan Malaysia (UKM), 43600 Bangi, Malaysia.
authors.forename: Qahtan Khalaf
authors.initials: QK
authors.lastname: Omran
authors.affiliation: Department of Electrical, Electronic and Systems Engineering, Faculty of Engineering & Built Environment, Universiti Kebangsaan Malaysia (UKM), 43600 Bangi, Malaysia.
authors.forename: Mohammad Tariqul
authors.initials: MT
authors.lastname: Islam
authors.affiliation: Department of Electrical, Electronic and Systems Engineering, Faculty of Engineering & Built Environment, Universiti Kebangsaan Malaysia (UKM), 43600 Bangi, Malaysia.
authors.forename: Norbahiah
authors.initials: N
authors.lastname: Misran
authors.affiliation: Institute of Space Science (ANGKASA), Faculty of Engineering & Built Environment Building, Universiti Kebangsaan Malaysia (UKM), 43600 Bangi, Malaysia.
authors.forename: Mohammad Rashed Iqbal
authors.initials: MR
authors.lastname: Faruque
mesh_terms: D000465:Algorithms; D008962:Models, Theoretical