摘  要：示波器是电子测量中一种最常用的仪器，被广泛应用于各个领域。与模拟示波器相比，数字示波器具有很多优点，并开始逐步取代模拟示波器，成为市场上的主流。目前，国外在数字示波器领域的技术已经非常成熟，并且占据了大部分的国内市场分额。本文充分利用Microblaze高速的信号处理能力，FPGA丰富的接口资源和强大的控制功能，采用Microblaze+FPGA结构，液晶显示器显示，设计了一款数字示波器。对系统可能存在的一些干扰和影响进行详细的分析，并给出了相应的解决措施。系统采用模块化设计，易于维护和扩展，具有广阔的市场应用前景。93912

毕业论文关键词：Microblaze；A/D转换器；示波器；VHDL

Abstract:Oscilloscopes is most commonly used in electronic measuring instrument, widely used in various fields。Compared with analog Oscilloscopes, digital oscilloscope has a lot of advantages, and began to gradually replace the analog oscilloscope, become the mainstream in the market。At present, in the technology of digital Oscilloscopes is very mature, and accounts for most of the domestic market share。Domestic products with independent intellectual property rights of digital storage Oscilloscopes are rare, independently developed digital oscilloscope as necessary。This paper describes the principles of digital Oscilloscopes, oscilloscope technology at home and abroad on the basis of reference and absorption is designed 50MHz digital storage oscilloscope based on Microblaze。Microblaze+FPGA structure is used in the system, making full use of Microblaze's high-speed signal processing capability, FPGA-rich interface and powerful functions, use the LCD monitor to display。 System structure flexible, modular design, easy to maintain and extend, and liquid crystal display provides users with a friendly interface。 Some that may exist on the system interference and detailed analysis of the impact and corresponding measures。 Through the development of specific design to achieve the design goals of this article。

Keywords：  Microblaze，A/Dconverter，Oscilloscope，VHDL

目    录

0绪论 5

1 系统的总体方案 5

1。1设计原理及思路 5

1。2系统的总体方框图 6

2 方案论证 7

2。1任务分析与实现 7

2。2硬件方案论证 8

2。2。1整体方案选择 8

2。2。2显示器件选择 9

2。2。3A/D转换器选择 9

2。2。4可编程增益放大器方案论证 10

2。2。5模拟电压输出方案论证 11

3 数字示波器硬件设计 12

3。1 电源电路设计 12

3。2 耦合和衰减电路设计 13

3。3 增益可变放大电路设计 13

3。4 A/D转换电路设计 14

3。5PWM电路设计 15

3。6显示设计 16

3。7整体电路 17

4 数字示波器FPGA设计 18

4。1设计思路 18

4。2顶层设计