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Design of Direct Digital Frequency Synthesizer Based on CORDIC Algorithm and Implementation

Author: NieQiang
Tutor: LiuYanMing
School: Xi'an University of Electronic Science and Technology
Course: Communication and Information System
Keywords: Direct Digital Frequency Synthesizer CORDIC ROM FPGA
CLC: TN741
Type: Master's thesis
Year: 2011
Downloads: 164
Quote: 1
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Abstract


The direct digital frequency synthesizer ( DDS ) is the main tool of modern frequency synthesizer , it has the advantages of high frequency resolution, continuous change of phase , frequency conversion and fast . This device is widely used in many other fields. The main purpose of this paper is to design a hardware resource consumption , and easy to implement DDS system . First, in the analysis of the performance characteristics of traditional DDS , reduce DDS ROM consumption , this paper uses a pipelined architecture of the CORDIC algorithm instead of the the traditional DDS system ROM look-up table method . Second, the use of FPGA design and the digital part of the DDS system , including the phase accumulator , tune adder , phase-amplitude converter and AM multipliers , amplitude modulation , phase modulation and frequency modulation function at the same time . Finally, the Quartus II simulation tools the DDS module functions and system functions , and contrast the the traditional DDS system designed in this paper DDS system hardware overhead . The contrast results show that the using CORDIC algorithm helps to reduce the consumption of the DDS system 's ROM . Then the output spectrum of the DDS system the traditional DDS system designed in this paper using Matlab simulation comparison , results show that the CORDIC algorithm helps to reduce spurious spectral lines of the DDS system .

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Basic electronic circuits > Frequency synthesizer technology,frequency synthesizer > Direct method
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