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Low-spur DDS (Direct Digital Synthesizer) source and method for reducing spur of DDS source

A low spurious and spurious technology, applied in the direction of instruments, electrical digital data processing, digital data processing components, etc., to achieve good output spurious performance, reduce costs, and reduce the effect of amplitude

Active Publication Date: 2017-02-08
CHENGDU SIMON ELECTRONICS TECH
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  • Abstract
  • Description
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Problems solved by technology

(3) Due to the non-ideal characteristics of DAC, in addition to the main frequency, spurious components will appear in the output spectrum of DDS
At the same time, the mixing itself will generate additional spurious signals, and the mixing scheme must be carefully planned and the necessary filters must be added

Method used

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  • Low-spur DDS (Direct Digital Synthesizer) source and method for reducing spur of DDS source
  • Low-spur DDS (Direct Digital Synthesizer) source and method for reducing spur of DDS source
  • Low-spur DDS (Direct Digital Synthesizer) source and method for reducing spur of DDS source

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Embodiment Construction

[0038] The present invention will be further described in detail below in combination with specific embodiments. However, it should not be understood that the scope of the above subject matter of the present invention is limited to the following embodiments, and all technologies realized based on the content of the present invention belong to the scope of the present invention.

[0039] Such as figure 2 The structure diagram of the low spurious DDS source of the present invention is shown; wherein, the low spurious DDS source of the present invention includes a multi-channel DDS source, a control word output module, a spectrum detection module, a combiner and a coupler.

[0040] Wherein, one output channel of the multi-channel DDS source is connected to the coupler, and at least two other output channels are connected to the coupler through a combiner. The control word output module is connected to the multi-channel DDS source, and outputs the main signal control word to the...

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Abstract

The invention discloses a low-spur DDS (Direct Digital Synthesizer) source and a method for reducing the spur of the DDS. The method mainly comprises the following steps: generating cancellation signals corresponding to all spur signals according to spectrum information of all the spur signals in a main signal, and canceling all the spur signals in the main signal through the cancellation signals according to the fact that the frequencies and the amplitudes of the cancellation signals and the spur signals are the same but the phases are opposite, so that the spur output performance of the DDS is improved. Therefore, the low-spur DDS source disclosed by the invention only needs to be additionally provided with one multiplexer and one coupler; and no excessive circuit complexity and no extra circuit area can be increased, and the cost can be reduced.

Description

technical field [0001] The invention relates to the technical field of digital signal processing, in particular to a low stray DDS source and a method for reducing strays. Background technique [0002] With the development of electronic equipment, electronic systems put forward higher and higher requirements for frequency sources, especially for key indicators such as phase noise, frequency hopping speed, spurious and small steps. [0003] At present, direct digital frequency synthesis technology is widely used in realizing low phase noise, fast frequency hopping and small steps. The working principle of direct digital frequency synthesizer (referred to as DDS) is as follows: figure 1 As shown, DDS generally consists of four parts: phase accumulator (PA), phase-amplitude conversion table (ROM), digital-to-analog converter (DAC) and low-pass filter (LPF). Under the control of the reference clock CLK, the phase accumulator linearly accumulates the frequency control word CWF,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F1/03
CPCG06F1/0321Y02D30/70
Inventor 吴成林王崔州
Owner CHENGDU SIMON ELECTRONICS TECH
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