High-precision digital-to-analog conversion device and method

Abstract

The invention discloses a high-precision digital-to-analog conversion device and method. The high-precision digital-to-analog conversion device comprises a control module, n conversion modules, an adder and a feedback module, wherein n is an integer greater than or equal to 2; the conversion coefficient of the conversion module is gradually increased; the control module is used for splitting an input digital signal into n intermediate digital parts, dividing the n intermediate digital parts by corresponding conversion coefficients to obtain n intermediate digital signals, and respectively transmitting the n intermediate digital signals to the n conversion modules; wherein the middle number part is increased step by step; the conversion module is used for performing digital-to-analog conversion on the intermediate digital signal to obtain a result containing a conversion coefficient; the adder is used for adding the output signals of all the conversion modules to obtain an analog signal; the feedback module obtains a feedback signal according to the analog signal; the control module adjusts distribution of the intermediate digital portion according to the target digital signal and the feedback signal. According to the embodiment of the invention, high-precision output of the digital-to-analog conversion device can be realized on the basis of ensuring low cost.

Description

technical field [0001] Embodiments of the present invention relate to the technical field of signal conversion, and in particular to a high-precision digital-to-analog conversion device and method. Background technique [0002] Industrial control systems often need to use high-precision analog-to-digital converters (Analogue-to-Digital Conversion, ADC) for signal acquisition during signal isolation and transmission, and also require high-resolution output voltage or current (such as transmitters, safety barriers, etc.) isolator, etc.). That is to say, a high-precision digital-to-analog converter (Digital-to-Analogue Conversion, DAC) is required. [0003] There are usually two existing high-precision DA output schemes: one is output after PWM filtering; this method is low in cost but has poor device performance and slow response time (it takes hundreds of milliseconds to reach 99%, and it takes seconds to reach 99.99%). level), and short-term fluctuations are large, and the...

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Problems solved by technology

[0003] There are usually two existing high-precision DA output schemes: one is output after PWM filtering; this method is low in cost but has poor device performance and slow response time (it takes hundreds of milliseconds to reach 99%, and it takes seconds to reach 99.99%). level), and short-term fluctuations are large, and the linearity is poor; the other is to use a dedicated DAC chip output; although this method has good performance, it is expensive

Therefore, there is a conflicting relationship between cost and performance of existing digital-to-analog conversion devices

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