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IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS--I: REGULAR PAPERS, VOL. 57, NO. 4, APRIL 2010 863 A Direct Digital Frequency Synthesizer Based on the
 

Summary: IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS--I: REGULAR PAPERS, VOL. 57, NO. 4, APRIL 2010 863
A Direct Digital Frequency Synthesizer Based on the
Quasi-Linear Interpolation Method
Ashkan Ashrafi, Senior Member, IEEE, Reza Adhami, Senior Member, IEEE, and
Aleksandar Milenkovic´, Member, IEEE
Abstract--This paper introduces a novel direct digital frequency
synthesizer (DDFS) with an architecture based on the quasi-linear
interpolation method (QLIP). The QLIP method is a hybrid poly-
nomial interpolation in which the first quarter of a cosine func-
tion is approximated by two sets of linear and parabolic polyno-
mials. The section of the cosine function that is closer to its peak
is interpolated by parabolic polynomials, due to its resemblance
to a parabola. The rest of the function, which is closer to where it
approaches zero, is interpolated by linear polynomials. The paper
describes the proposed interpolation method and its VLSI imple-
mentation. The performance of the proposed implementations is
compared to several state-of-the-art DDFS designs.
Index Terms--Direct digital frequency synthesizer (DDFS),
polynomial interpolation, spurious free dynamic range.
I. INTRODUCTION

  

Source: Ashrafi, Ashkan - Department of Electrical and Computer Engineering, San Diego State University

 

Collections: Engineering; Computer Technologies and Information Sciences