Earticle

초록

영어

DDFS (Direct Digital Frequency Synthesizer) is a new technique of frequency synthesizes which introduces the advanced digital processing theory into frequency synthesis. A direct digital frequency synthesizer is composed of a phase accumulator, an adder, an ROM for wave pattern saving, a D/A converter and a LPF (low pass filter). With the rapid development of VLSI, the speed of algorithm is required increasingly higher. This paper proposes a new frequency synthesizer by improving the structure of data storage which ensures the accuracy and speed. Rotation method was used to resolve the expected angle into many small rotation angles and sting wave symmetry principle was used to resolve the string wave. From point to area, the values in one quadrant were calculated and sampled and then the data was saved in ROM. Under the control of frequency, the data in ROM was read and then transferred to the D/A converter chip and the following low pass filter to achieve frequency synthesize. This algorithm could reduce the usage of ROM to increase the calculation efficiency.

목차

Abstract
 1. Introduction
 2. Frequency Synthesizer
  2.1. Direct Analog Synthesis
  2.2 Indirect Frequency Synthesis
  2.3 Direct Digital Frequency Synthesis
  2.4 The Design of String Wave Generator
  2.5 Error Analysis
 3.The Design and Realization of the Frequency Synthesizer
  3.1The Application of String Wave Symmetry
  3.2 The Improvement of Register
  3.3 The Realization of Frequency Synthesizer
 4. The Simulation and Assessment of the Frequency Synthesizer
  4.1 Design of the Frequency Generator
  4.2 The FPGA Realization of the Frequency Synthesizer
  4.3 The Result and Analysis of Simulation
 5. Conclusions
 References

키워드

저자

• Zhanpeng Jiang [ Department of Integrated circuits design and integrated systems, Harbin University of Science and Technology, Harbin, Heilongjiang, China ]
• Rui Xu [ Department of Integrated circuits design and integrated systems, Harbin University of Science and Technology, Harbin, Heilongjiang, China ]
• Hai Huang [ Department of Integrated circuits design and integrated systems, Harbin University of Science and Technology, Harbin, Heilongjiang, China ]
• Changchun Dong [ Department of Integrated circuits design and integrated systems, Harbin University of Science and Technology, Harbin, Heilongjiang, China ]

참고문헌

발행기관

간행물

표지보기 관심저널 등록

• 간행물명

  International Journal of Signal Processing, Image Processing and Pattern Recognition

• 간기

  격월간

• pISSN

  2005-4254

• 수록기간

  2008~2016

• 십진분류

  KDC 505 DDC 605