基于单片机的简易数字存储示波器-学士论文.doc

目录 摘要 I Abstract II 1 绪论 1 1.1示波器发展简史与现状 1 1.2 示波器原理概述 3 1.3 模拟示波器与数字示波器 5 1.4 设计任务与目标 9 2.数字示波器总体设计 10 2.1数字示波器总体结构 10 2.2数字示波器采样速率 11 2.3数字示波器采样原理 12 3 数字示波器硬件设计 14 3.1信号调理电路 14 3.1.1输入衰减电路 15 3.1.2程控放大电路 16 3.1.3电平移位电路 18 3.1.4硬件触发电路 19 3.1.5 AD转换电路 21 3.2数字处理电路 23 3.2.1 CPLD电路 23 3.2.2 MCU电路 24 4.数字示波器软件设计 28 4.1同步触发 29 4.2串行通信 31 4.3 波形显示 33 4.4峰峰值计算 34 5 数字示波器的调试和测试 36 5.1硬件安装调试和软件调试 36 5.2测试方案 36 5.3性能测试 37 参考文献 38 致谢 40 摘要 本文 本论文主要研究了 研究结果表明 本文的特色在于 摘要：单片机；CPLD；等效采样；数字示波器 Abstract In this paper, the working principle of the oscilloscope were introduced, the MCU and CPLD-based digital storage oscilloscope of the 20M design. FPGA through the control of high-speed A / D converter ADS831 samples the input signal, the signal input frequency in real time when less than 4MHz sampling, higher than the equivalent time sampling 4MHz. Equivalent Sampling is sampling for a number of signal cycles to rehabilitation is a signal waveform, the sampling system can be a way to extend the complex is much higher than the Nyquist frequency limit of the signal wave frequency. Through the use of low equivalent sampling can obtain a higher sampling frequency of the input signal collection, thereby reducing the speed of the AD to reduce the hardware cost oscilloscopes. In this paper, designed by the oscilloscope for the development and manufacture of oscilloscopes have a certain significance. This paper studied the equivalent in the digital sampling oscilloscope in the development of applications, given the production of Digital Oscilloscope 20M program. Designed hardware oscilloscope analog signal processing circuit, CPLD sampling control circuit and the needs of human-computer interaction by single-chip control circuit. Software, depending on the frequency of the input signal the option of using real-time sampling and equivalent sample equivalent, at the same time to achieve a good human interface. The results show that the use of the equivalent sampling technique that can sol