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Digital-to-analog conversion device and method

A digital-to-analog conversion and digital-to-analog converter technology, applied in the field of signal processing, can solve problems such as limited application fields and expensive DA converters, and achieve the effect of easy implementation and simple structure

Inactive Publication Date: 2016-10-12
SHANGHAI ASTRONOMICAL OBSERVATORY CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Such DA converters are usually expensive and have limited applications

Method used

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  • Digital-to-analog conversion device and method
  • Digital-to-analog conversion device and method

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Embodiment Construction

[0031] Below according to the attached Figure 1-2 , give a preferred embodiment of the present invention, and give a detailed description, so that the functions and characteristics of the present invention can be better understood.

[0032] see figure 1 , a digital-to-analog conversion device of the present invention, comprising:

[0033] A digital-to-analog driver 1, which is used to convert the first digital signal of a K-bit length input from the outside into a second digital signal of an N-bit length, wherein K>N, K and N are integers greater than zero;

[0034] A digital-to-analog converter 2 with an accuracy of N digits for receiving the second digital signal and converting the second digital signal into a first analog signal.

[0035] A low-pass filter 3 is used to receive the first analog signal, perform low-pass filtering on the first analog signal, and output a second analog signal.

[0036] The adoption of the digital-to-analog driver 1 realizes the conversion o...

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Abstract

The invention provides a digital-to-analog conversion device and a digital-to-analog conversion method. The device comprises a digital / analog driver, used for converting a first digital signal with the length of K bits input from the outside into a second digital signal with the length of N bits, wherein K is more than N, and both K and N are integers more than zero; a digital / analog converter with the precision digits of N, used for receiving the second digital signal, and converting the second digital signal into a first analog signal; and a low-pass filter, used for receiving the first analog signal, performing low-pass filtering on the first analog signal, and outputting a second analog signal. The digital-to-analog conversion device and method of the invention achieve the output of high-precision analog signal with the input of high-order digit digital signal based on the existing low-order digit DA converter, and has the advantages of low cost and high resolution precision.

Description

technical field [0001] The invention relates to the field of signal processing, in particular to a digital-to-analog conversion device and method. Background technique [0002] In the field of high-precision time and frequency, it is necessary to precisely control such as an oven-controlled crystal oscillator (OCXO) or a varactor diode. Such a control signal may require a control voltage accuracy of several uV. With the development of digital technology, more and more control circuits adopt digital control methods, which perform analog-to-digital conversion (AD) on analog signals and perform digital processing, and then output data to digital-to-analog converters (DA) for conversion into analog voltage signals. . For a circuit like controlling an OCXO, in order to achieve a voltage control accuracy of the uV level, the DA converter is generally required to have an analysis accuracy of more than 20 bits. Such DA converters are usually expensive and have limited applications...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03M1/66
CPCH03M1/66
Inventor 帅涛林传富谢勇辉陈鹏飞裴雨贤沈超潘晓燕赵阳薛红
Owner SHANGHAI ASTRONOMICAL OBSERVATORY CHINESE ACAD OF SCI