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Research On High-precision Digital-to-analog Conversion Technology Based On Magnetic Modulation

Posted on:2022-09-05Degree:MasterType:Thesis
Country:ChinaCandidate:W X SunFull Text:PDF
GTID:2518306566989319Subject:Signal and Information Processing
Abstract/Summary:PDF Full Text Request
Digital-to-analog converter and analog-to-digital converter form the bridge between the digital and analog worlds together,both of which are widely used in automatic control,wireless communication and so on as they play an extremely important role in the development of modern technology.At the same time,the digital-to-analog converter is the design basis of analog-to-digital converter,therefore,it is very important to design a high precision digital-to-analog converter for many high-performance electronic systems.This circuit structure promotes the development of digital to analog converter while limiting the improvement of its accuracy as the traditional digital-to-analog converter mostly adopts the structure of R-2R resistor ladder network.In order to improve the instability of a weighting circuit,a low-noise ampere-turn comparator using a second-harmonic type of magnetic modulator is used.And each coil in the proportional winding is wound according to the binary proportional relation.The code weight of each input bit is established through turns on a magnetic core rather than by a resistor ladder network.,which can effectively eliminate the influence of resistance fluctuation on the accuracy of digital to analog converter.This paper introduces in detail the circuit structure and conversion principle of traditional digital-to-analog converter,such as weighted resistor network,weighted current network,weighted capacitor network and switch tree based on the basic principle of magnetic modulated digital-to-analog converter,and focuses on the working principle and error analysis of the double-core magnetic modulator driven by square wave.Based on this,it designs a magnetic modulated digital-to-analog converter with 20-bit and full-scale output of 10V.This paper focuses on testing the static characteristics of the magnetic modulated digital-to-analog converter,which shows that the maximum differential nonlinear error is 1.15m V,the maximum integral nonlinear error is 2.05m V.And the output noise of the DAC obtained is about 2×10~4 of the full scale output range,which meets the expected design requirements.
Keywords/Search Tags:Digital-to-analog converter, Magnetic modulator, High precision, The ratio windings
PDF Full Text Request
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