System and method for reducing harmonic noise of digital-synthesis sine waves

A digital synthesis, sine wave technology, applied in the direction of output stability, pulse generation, electrical components, etc., can solve problems such as unrealizable, large harmonic noise, filter circuit design and implementation difficulties, etc.

Active Publication Date: 2010-07-14
中国航天科技集团公司第五研究院第五一四研究所
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Problems solved by technology

Tests and analysis have shown that generally digitally synthesized sine waves have relatively large harmonic noise. To generate low-noise sine waves, it is generally improved by subsequent high-order low-pass filtering, but when the frequency is required to

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  • System and method for reducing harmonic noise of digital-synthesis sine waves
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  • System and method for reducing harmonic noise of digital-synthesis sine waves

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Embodiment Construction

[0111] Below in conjunction with accompanying drawing, the present invention is described in further detail:

[0112] see figure 1 , a system for reducing harmonic noise of a digitally synthesized sine wave, comprising a frequency and phase controller, a digitally synthesized sine wave circuit, a harmonic cancellation function generating circuit, an adding circuit and a low-pass filter, the frequency and phase controller simultaneously A digitally synthesized sine wave circuit and a harmonic canceling function generating circuit are connected, and the digitally synthesized sine wave circuit and the harmonic canceling function generating circuit are respectively connected to an adding circuit, and the adding circuit is connected to a low-pass filter.

[0113] The digital synthesis sine wave circuit generates a stepped sine wave according to the frequency set by the frequency and phase controller, and the harmonic cancellation function generating circuit generates a step-shaped...

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Abstract

The invention provides a system and a method for reducing the harmonic noise of digital-synthesis sine waves. The system comprises a frequency and phase controller, a digital-synthesis sine wave circuit, a harmonic counteraction function generation circuit, an adder circuit and a low-pass filter, the harmonic counteraction function generation circuit is utilized to control the digital-synthesis sine wave circuit to generate a step sine wave according to a set frequency, meanwhile, the harmonic counteraction function generation circuit is controlled to generate a 'harmonic counteraction function wave' synchronized with the step sine wave, the two signals are superposed by the adder circuit, the fundamental wave signal and the M-1 harmonic component in an output signal are not counteracted, other harmonic components are remarkably reduced, the output signal then passes through the low-pass filter, a cutoff frequency is appropriately selected, so that M-1 and higher subharmonics far from the fundamental wave can be filtered, and thereby a sine wave signal with little harmonic noise can be obtained.

Description

technical field [0001] The invention relates to the fields of measurement and control, in particular to a system and method for reducing digitally synthesized sine wave harmonic noise. Background technique [0002] As a test or carrier signal, the sine wave has a wide range of applications and is the most important and basic waveform. In practical applications, how to reduce the harmonic noise in the process of sine wave generation is a very basic and important research topic. Digitally synthesized sine wave is a technology that uses a digital-to-analog converter (D / A converter) as the core to generate a sine wave signal by fitting a rectangular step. It has a wide range of applications in the fields of measurement and control. Tests and analysis have shown that generally digitally synthesized sine waves have relatively large harmonic noise. To generate low-noise sine waves, it is generally improved by subsequent high-order low-pass filtering, but when the frequency is requi...

Claims

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Application Information

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IPC IPC(8): H03K4/92H03L1/00
Inventor 王斌潘攀严明冯文武
Owner 中国航天科技集团公司第五研究院第五一四研究所
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