本文關(guān)鍵詞：基于FPGA的∑-△數(shù)模轉(zhuǎn)換器的設(shè)計(jì)與實(shí)現(xiàn)　出處：《曲阜師范大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 數(shù)模轉(zhuǎn)換器 噪聲整形技術(shù) 過采樣技術(shù) 穩(wěn)定性 非線性

【摘要】：隨著數(shù)字信號(hào)處理技術(shù)的發(fā)展,電子系統(tǒng)對(duì)數(shù)模轉(zhuǎn)換器的要求也越來越高,采用傳統(tǒng)技術(shù)生產(chǎn)的數(shù)模轉(zhuǎn)換器在精度和處理速度方面已經(jīng)很難滿足現(xiàn)在高精度轉(zhuǎn)換的要求。而采用了總和增量調(diào)制技術(shù)與過采樣技術(shù)的數(shù)模轉(zhuǎn)換器在精度和速度這兩個(gè)重要指標(biāo)上都有了很大地提高,很好地滿足了市場(chǎng)的需求。目前,采用了這兩項(xiàng)技術(shù)的數(shù)模轉(zhuǎn)換器已經(jīng)被應(yīng)用于許多領(lǐng)域,例如高精度轉(zhuǎn)換,智能電子設(shè)備以及高端的電子儀器中等。本實(shí)驗(yàn)通過采用高階的調(diào)制器,使得轉(zhuǎn)換器在精度和速度方面有了明顯的提高。在高階過采樣數(shù)模轉(zhuǎn)換器設(shè)計(jì)中,最重要的兩點(diǎn)就是要解決噪聲的非線性以及系統(tǒng)的不穩(wěn)定性問題,本設(shè)計(jì)圍繞以上兩個(gè)難點(diǎn)展開。首先介紹了噪聲整形技術(shù),然后又對(duì)過采樣技術(shù)的基本原理進(jìn)行了介紹,最后基于以上兩項(xiàng)技術(shù)設(shè)計(jì)出符合本設(shè)計(jì)需求的達(dá)到16bit精度的滿量程輸入范圍的四階過采樣數(shù)模轉(zhuǎn)換器。通過MATLAB的行為級(jí)仿真驗(yàn)證,以16位的音頻信號(hào)為輸入,最終測(cè)得該系統(tǒng)的信噪比達(dá)到了90dB,能夠處理的信號(hào)帶寬達(dá)到了20kHz,調(diào)制器能夠穩(wěn)定工作的輸入幅度范圍為0-0.6Vret,以上指標(biāo)均滿足了本設(shè)計(jì)要求。最后在ALTERA公司生產(chǎn)的DE2 FPGA開發(fā)板上對(duì)所設(shè)計(jì)的數(shù)模轉(zhuǎn)換器進(jìn)行了硬件實(shí)現(xiàn)與驗(yàn)證�，F(xiàn)今大多數(shù)芯片都是已經(jīng)成型的,不能嵌入到其他的系統(tǒng)中。由于本設(shè)計(jì)是在FPGA平臺(tái)上設(shè)計(jì)實(shí)現(xiàn),因此可以將其作為一個(gè)基本模塊嵌入到其他相關(guān)系統(tǒng)中,方便其他的實(shí)驗(yàn)設(shè)計(jì),因此該實(shí)驗(yàn)設(shè)計(jì)具有一定的實(shí)用性。
[Abstract]:With the development of digital signal processing technology, the demand of electronic system for digital-to-analog converter is more and more high. The digital-to-analog converter produced by traditional technology has been difficult to meet the requirements of high precision conversion in terms of accuracy and processing speed. The precision and speed of digital-to-analog converter based on summation increment modulation and over-sampling technology have been improved. Both of these two important indicators have been greatly improved. At present, digital-to-analog converters with these two technologies have been applied in many fields, such as high-precision converters. Intelligent electronic equipment and high-end electronic instruments are medium. In this experiment, the precision and speed of the converter are improved obviously by using high-order modulator. In the design of high-order over-sampling digital-to-analog converter. The most important two points are to solve the problem of nonlinear noise and the instability of the system. This design focuses on the above two difficulties. Firstly, the noise shaping technology is introduced. Then the basic principle of oversampling technology is introduced. Finally, based on the above two techniques, a four-order over-sampling digital-to-analog converter with 16bit precision full range input range is designed, which is verified by the behavior level simulation of MATLAB. Taking 16-bit audio signal as input, the signal-to-noise ratio (SNR) of the system is up to 90 dB, and the signal bandwidth can be processed to 20 kHz. The input amplitude of the modulator can be stabilized in the range of 0-0.6 Vret. All the above indexes meet the requirements of the design. Finally, the DE2 produced in ALTERA Company. On the FPGA development board, the design of the digital-to-analog converter is implemented and verified by hardware. Nowadays, most of the chips have been formed. Because this design is designed and implemented on the FPGA platform, it can be embedded as a basic module in other related systems to facilitate other experimental design. Therefore, the experimental design has certain practicability.
【學(xué)位授予單位】：曲阜師范大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TN792

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