【作者】 雷勇；

【导师】 王厚军；

【作者基本信息】 电子科技大学 ， 检测技术与自动化装置， 2013， 硕士

【摘要】 随着时代的发展，科技的进步，电子领域测试信号的复杂度越来越高。测试信号已经由单一的模拟信号或者数字信号发展到了两种信号兼具的复杂混合信号。对于复杂的混合信号，单纯依靠普通的数字存储示波器或逻辑分析仪已经不能很好的完成测试任务，面对如此复杂的混合信号，混合信号分析仪却能够更好的应对并且能够高效的完成测试任务。混合信号分析仪是一种综合性测试仪器。它既具有数字存储示波器对模拟信号波形的幅度、频率等时域特性的分析功能，同时又具有逻辑分析仪多通道、在数据域内对信号特性的分析功能。本课题的目的是实现2GSa/s混合信号分析仪示波器模块的硬件系统进行了研究与设计。首先完成了整个硬件系统平台的搭建，然后该平台为基础，重点实现了触发电路设计以及峰值检测电路设计，具体研究内容如下：1．确定了整个系统的设计方案：主要包括了信号调理电路的设计、数据存储采集与控制电路设计、触发电路设计以及PCI接口电路设计方案。2．具体介绍了触发电路的设计：首先重点讲述了触发信号调理电路的设计，主要包括了触发源选择电路，触发比较电路以及触发门限电平产生电路。然后根据已有的触发脉宽重点讲述了在FPGA内部是如何实现以下四种触发类型的，即：视频触发、脉宽触发、欠幅触发和交互触发。3．重点讨论了峰值检测电路设计：首先介绍了峰值检测的意义，然后分别介绍了模拟式峰值检测和数字式峰值检测两种不同的实现方法。通过比较，最终本课题选择了数字式峰值检测，并对其具体实现进行了详细阐述。混合信号示波器硬件系统设计完成后，进行了各部分电路及整机的调试与试验，通过不断的改进，最终试验结果表明各项指标和功能都达到了设计要求，基本实现了本课题的预期目标。更多还原

【Abstract】 With the development of times and the progress of science and technology, thecomplexity of test signal in the electronics field is increasing. Test signal has progressedfrom a single digital signal or analog signal to a complex mixed signal containing theabove two kinds of signals. For complex mixed signal, it can not complete the testingtask very well just by ordinary digital storage oscilloscope or simple logic analyzer.Mixed signal analyzer is a kind of comprehensive test device. Its functioncombines analysis of analog signal wave ’s amplitude, frequency of digital storageoscilloscope in time domain and analysis of the signal characteristics of multichannellogic analyzer in data domain.This subject mainly designs the hardware system of oscilloscope module of2GSa/s mixed signal analyzer. Based on the mixed signal oscilloscope hardware system,analog channel circuit, data acquisition, storage and control circuit, and PCI interfacecircuit are mainly designed. The specific content of this paper as follows:1. Determine the design scheme of the whole system. It mainly includes the designof signal conditioning circuit, data acquisition, storage and control circuit design, triggercircuit design and PCI interface circuit design.2. Trigger circuit design is introduced in detail. First of all,this paper focuse on thetrigger signal conditioning circuit design, mainly including the trigger source selectingcircuit, trigger comparison circuit and the trigger threshold level circuit. On the basis ofthe existing trigger pulse width and then focus on how to implement the following fourtypes of trigger in the FPGA internal, namely:TV Trigger,Pulse Width Trigger, OweAmplitude Trigger and Interaction Trigger3. Peak detection circuit design has been discussed in detail. First, this paperintroduces the significance of peak detection, then respectively introduces method oftwo different implementations that is analog peak detection and digital peak detection.By comparison, this subject eventually chooses digital peak detection,and gives adetailed description of it’s realizationAs mixed-signal oscilloscope hardware system design completed, all parts of the circuit and complete machine were debugged and tested. Through continuousimprovement, the final experiment result shows that all indexes and functions fulfill thedesign requirements, and this subject has been basically achieved the expected goal.更多还原