A Direct Digital Frequency Synthesizer Based on the Quasi-Linear Interpolation Method

被引：30

作者：

Ashrafi, Ashkan ^{[1
]}

Adhami, Reza ^{[2
]}

Milenkovic, Aleksandar ^{[2
]}

机构：

[1] San Diego State Univ, Dept Elect & Comp Engn, San Diego, CA 92182 USA

[2] Univ Alabama, Dept Elect & Comp Engn, Huntsville, AL 35899 USA

来源：

IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS I-REGULAR PAPERS | 2010年 / 57卷 / 04期

关键词：

Direct digital frequency synthesizer (DDFS); polynomial interpolation; spurious free dynamic range; PHASE; AMPLITUDE;

D O I：

10.1109/TCSI.2009.2027645

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

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 polynomial interpolation in which the first quarter of a cosine function is approximated by two sets of linear and parabolic polynomials. 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 implementation. The performance of the proposed implementations is compared to several state-of-the-art DDFS designs.

引用

页码：863 / 872

页数：10

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