基于FPGA的∑-△数模转换器的设计与实现

发布时间：2018-01-17 20:32

本文关键词：基于FPGA的∑-△数模转换器的设计与实现　出处：《曲阜师范大学》2015年硕士论文　论文类型：学位论文

【摘要】：随着数字信号处理技术的发展,电子系统对数模转换器的要求也越来越高,采用传统技术生产的数模转换器在精度和处理速度方面已经很难满足现在高精度转换的要求。而采用了总和增量调制技术与过采样技术的数模转换器在精度和速度这两个重要指标上都有了很大地提高,很好地满足了市场的需求。目前,采用了这两项技术的数模转换器已经被应用于许多领域,例如高精度转换,智能电子设备以及高端的电子仪器中等。本实验通过采用高阶的调制器,使得转换器在精度和速度方面有了明显的提高。在高阶过采样数模转换器设计中,最重要的两点就是要解决噪声的非线性以及系统的不稳定性问题,本设计围绕以上两个难点展开。首先介绍了噪声整形技术,然后又对过采样技术的基本原理进行了介绍,最后基于以上两项技术设计出符合本设计需求的达到16bit精度的满量程输入范围的四阶过采样数模转换器。通过MATLAB的行为级仿真验证,以16位的音频信号为输入,最终测得该系统的信噪比达到了90dB,能够处理的信号带宽达到了20kHz,调制器能够稳定工作的输入幅度范围为0-0.6Vret,以上指标均满足了本设计要求。最后在ALTERA公司生产的DE2 FPGA开发板上对所设计的数模转换器进行了硬件实现与验证。现今大多数芯片都是已经成型的,不能嵌入到其他的系统中。由于本设计是在FPGA平台上设计实现,因此可以将其作为一个基本模块嵌入到其他相关系统中,方便其他的实验设计,因此该实验设计具有一定的实用性。
[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.
【学位授予单位】：曲阜师范大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN792

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