Low-spurious sinusoidal signal generator based on multi-point compensation scheme

A sine signal and generator technology, applied in the field of signal processing, can solve the problems of low D/A conversion rate and low D/A effective number of digits, and achieve the effect of meeting application requirements

Active Publication Date: 2017-08-11
BEIJING DONGFANG MEASUREMENT & TEST INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is limited to the index level of D / A chips at the present stage. D / A with high conversion rate has low effective digits, and D / A with high effective digits has low conversion rate.

Method used

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  • Low-spurious sinusoidal signal generator based on multi-point compensation scheme
  • Low-spurious sinusoidal signal generator based on multi-point compensation scheme
  • Low-spurious sinusoidal signal generator based on multi-point compensation scheme

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Experimental program
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Embodiment Construction

[0062] The present invention is specifically described as follows in conjunction with specific embodiments:

[0063] For the defects in the prior art, it is necessary to find a signal whose fundamental wave is very small and does not affect the fundamental wave component of the original digitally synthesized sine wave signal after being superimposed, and other harmonics are as close as possible to those of the original digitally synthesized sine wave signal The harmonic components are the same (including amplitude and phase), and the two signals are subtracted and added to cancel.

[0064] According to the digitally synthesized sine wave signal function f(t) of formula (2), the most ideal offset function can be obtained as:

[0065]

[0066] exist interval, there are:

[0067]

[0068] The waveform of ξ(t) is shown as image 3 shown.

[0069] If another D / A truncated step signal is used to simulate ξ(t), its waveform is as follows Figure 4 shown.

[0070] At this t...

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Abstract

The invention aims to provide a low-spurious sinusoidal signal generator based on a multi-point compensation scheme. The low-spurious sinusoidal signal generator based on the multi-point compensation scheme comprises a main D / A conversion module and a high-speed D / A conversion module; the main D / A conversion module is a low-speed D / A converter having high effective bit, and is responsible for outputting sinusoidal waveform; the high-speed D / A conversion module generates a harmonic counteraction signal zeta(t), and is used for counteracting the harmonic component in the sinusoidal waveform generated by the main D / A conversion module; after being subjected to subtraction through an addition and subtraction operation circuit, the two signals are output; and thus, sinusoidal voltage output after harmonic counteraction is finally obtained. The low-spurious sinusoidal signal generator overcomes the disadvantage that both the effective bit and the conversion speed cannot be obtained at the same time in the prior art; when the harmonic component in the sinusoidal wave generated by the sinusoidal signal generator is effectively reduced, the A / D conversion speed of the sinusoidal signal generator can be ensured; and thus, sinusoidal wave signals having relatively low waveform deviation rate can be obtained.

Description

technical field [0001] The invention relates to the field of signal processing, in particular to a low stray sinusoidal signal generator based on a multi-point compensation scheme. Background technique [0002] The sinusoidal voltage source circuit is a circuit with a D / A converter as the core and a rectangular step fitting to generate a sinusoidal signal. Driven by the clock signal, the circuit periodically sends the digital sequence in the memory to the D / A converter, and the D / A converter outputs the step voltage of the analog sinusoidal signal, and the step voltage is smoothed by the low-pass filter (LPF) To obtain the required sinusoidal voltage signal, the specific structure of the sinusoidal voltage source circuit is as follows figure 1 shown. [0003] The digitally synthesized sine wave voltage is: [0004] when [0005] V in formula (1) 1 is the reference voltage of the D / A converter, M is the number of interpolation points, i=0,1,2,3,...,M, N is the number...

Claims

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Application Information

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IPC IPC(8): H03B28/00
CPCH03B28/00
Inventor 冯荣尉王斌宋博延峰陈阿琴崔玉妹侯旭玮王逸舟焦海妮王子月丁蔚
Owner BEIJING DONGFANG MEASUREMENT & TEST INST
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