北京邮电大学学报

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北京邮电大学学报

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DDS中实现相位至幅度映射的一种新方法

    

  1.  北京邮电大学 信息工程学院 , 北京 100876
  • 基金资助:
     

 A New Technique of Mapping from Phase to Amplitude in Direct Digital Frequency Synthesizer 

    

  1. Information Engineering School, Beijing University of Posts and Telecommunications, Beijing 100876, China
  • Supported by:
     

摘要: 提出了直接数字频率合成器 ( DDS)中相位至幅度映射的一种新方法 . 通过联合运用抛物线 近似和线性近似实现了对正弦信号的高精度近似 ,所产生的最大谐波电平为 - 56. 7 dB的正弦信 号 ,可直接应用于许多场合. 辅以少量 ROM则可以进一步提高输出正弦信号的精度. 

关键词:  , 直接数字频率合成器 ( DDS), 抛物线近似, 软件无线电

Abstract:   A new technique of mapping from phase to sine amplitudes in direct digital frequency synthesizer ( DDS) is presented in this paper. Through using parabolic approximation and linear approximation together, sine function signal is approximated with highly accuracy. The generated sine function signal with the maximum harmonic level of 56. 7 dB can be used directly in many situations. With the aid of few ROM the accuracy of the generated sine function signal can be improved even more.

Key words: direct digital frequency synthesizer ( DDS), parabolic approximation, software radio

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