A Low-Complexity Direct Digital Frequency Synthesizer
Lai Lin-hui1Li Xiao-jin1Lai Zong-sheng1,2
1. Institute of Microelectronics Circuit & System,East China Normal University2. Engineering Research Center for Nanophotonics & Advanced Instrument,Ministry of Education,East China Normal University
摘要：<正>The traditional direct digital frequency synthesizer （DDFS） based on a lookup table has very high complexity.This paper describes a low complexity DDFS using smaller lookup table and with minimum additional hardware.The lookup table for sine/cosine functions is split into a coarse-precision ROM and a fineprecision ROM.Approximation of fine-precision ROM and application of shift registers are introduced to further reduce the hardware complexity.The implemental results show that the total size of ROM in this proposed DDFS architecture is only 328 bits compared with 448 bits in [1],and the spectral purity can be as good as 63.58 dBc.
关键词：
low-complexity; direct digital frequency synthesis（DDFS）; digital communications; spectral purity.;
基金：
Shanghai Department of IT（No.04-001）； Shanghai AM Foundation（No.07SA07） that have supported this work；
会议名称：
2008 9th International Conference on Solid-State and Integrated-Circuit Technology
会议时间：
2008-10-20
会议地点：
中国北京
- 专辑：
电子技术及信息科学
- 专题：
无线电电子学
- 分类号：
TN741
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