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DDS (Direct Digital Synthesizer) signal spurious suppression method and system on basis of CORDIC (Coordinated Rotation Digital Computer) algorithm

A signal and algorithm technology, applied in the field of DDS signal spurious suppression, can solve the problems of hardware complexity and speed limitation, and achieve the effect of improving accuracy, easy implementation and speed.

Inactive Publication Date: 2012-11-21
HOHAI UNIV
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Problems solved by technology

The Taylor series approximation algorithm needs to use a multiplier, so it is limited in hardware complexity and speed

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  • DDS (Direct Digital Synthesizer) signal spurious suppression method and system on basis of CORDIC (Coordinated Rotation Digital Computer) algorithm
  • DDS (Direct Digital Synthesizer) signal spurious suppression method and system on basis of CORDIC (Coordinated Rotation Digital Computer) algorithm
  • DDS (Direct Digital Synthesizer) signal spurious suppression method and system on basis of CORDIC (Coordinated Rotation Digital Computer) algorithm

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Embodiment Construction

[0019] Below in conjunction with the accompanying drawings and specific embodiments, the present invention will be further clarified. It should be understood that these embodiments are only used to illustrate the present invention and not to limit the scope of the present invention. Modifications of equivalent forms all fall within the scope defined by the appended claims of this application.

[0020] In this embodiment, the DDS signal spurious suppression method based on the CORDIC algorithm calculates the sine and cosine signals of the signal through the CORDIC algorithm to complete the phase / amplitude conversion in the DDS system; it is not necessary to truncate the phase sequence output by the phase accumulator. All angles are transformed to the first quadrant through CORDIC transformation, and then the quadrant of the signal is determined according to the output data symbol, and then the transformation is carried out, so as to cover the complete cycle of (-π, π), and impro...

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Abstract

The invention discloses a DDS (Direct Digital Synthesizer) signal spurious suppression method and a DDS signal spurious suppression system on the basis of the CORDIC (Coordinated Rotation Digital Computer) algorithm. In the method, sine and cosine signals of a signal are calculated by the CORDIC algorithm to complete the phase / amplitude conversion in a DDS system; and all angles are transformed into the first quadrant by CORDIC transformation, then according to an output data symbol, a quadrant in which the signal is positioned is judged and the transformation is carried out so as to cover a (minus pi, pi) complete period. The system comprises a control circuit, a preprocessing unit, a CORDIC operational unit and a post-processing unit. According to the method and the system, the sine and the cosine values of the signal are directly calculated by the CORDIC algorithm without consuming more ROM (Read Only Memory) resources; the calculation of the sine and the cosine values of the signal can be completed only by carrying out simple iterative operations such as shift, addition and subtraction and the like; and the method and the system can also be easily implemented on a VLSI (Very Large Scale Integrated Circuits) chip and is very suitable for places with ultrahigh requirements on the resolution ratio and the accuracy of the signal frequency.

Description

technical field [0001] The invention relates to a DDS signal spurious suppression method and system based on CORDIC algorithm, which is a method for generating and processing electrical signals, and belongs to the technical field of circuits and information processing in the subject of electronic information. Background technique [0002] In the field of digital signal processing, the operation problems of basic functions such as vector rotation, trigonometric functions, and exponential functions are often encountered. [0003] The phase / amplitude conversion module is one of the core modules of the DDS system, and is usually implemented in two ways: ROM look-up table method and calculation method. The ROM look-up table method refers to pre-storing complete or partial signal values ​​in the ROM table, and using the phase sequence output by the phase accumulator as the address to obtain the signal values ​​in the ROM look-up table, thereby completing the phase-to-amplitude con...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/15
Inventor 李东新王亚平
Owner HOHAI UNIV
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