直接数字频率合成的分段抛物线插值

Proceedings of the IEEE 2002 Custom Integrated Circuits Conference (Cat. No.02CH37285) Pub Date : 2002-08-07 DOI:10.1109/CICC.2002.1012856

A. Eltawil, B. Daneshrad

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引用次数: 10

摘要

本文提出了一种直接数字频率合成(DDFS)的结构和实现方法。与现有架构相比，它使用更小的正弦函数查找表。正弦值的计算由抛物线插值结构完成，因此只需将插值系数存储在只读存储器(ROM)中。当SFDR值高达85 dBc时，ROM大小始终小于1 Kbit。

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Piece-wise parabolic interpolation for direct digital frequency synthesis

In this paper, a compact architecture and implementation for direct digital frequency synthesis (DDFS) is presented. It uses a smaller lookup table for sinusoidal functions compared to existing architectures. The computation of the sinusoidal values is performed by a parabolic interpolation structure, thus only interpolation coefficients need to be stored in the read-only memory (ROM). The ROM size is consistently less than 1 Kbit for SFDR values up to 85 dBc.

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Proceedings of the IEEE 2002 Custom Integrated Circuits Conference (Cat. No.02CH37285)

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