网络阻抗测试仪(D题)

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module, and will be for the signal through the high-speed comparator for phase discrimination, get out of phase Angle is the impedance. The measurement results after SCM processing with liquid crystal display, and through the keyboard control sine wave frequency step, user friendly interface. In system design, possible reducing power consumption. In order to improve the measurement precision, will each part of the circuit, reasonable distribution of error, the circuit to achieve the best effect of measurement.
2.关键字
MSP430 单片机，DDS，TL3016，CPLD
3.Abstract
This network impedance test instrument to MSP430 control and data processing as its core, and the sine signal generator module, I/V transform module, peak detection module, A/D conversion module, the keyboard module and LCD module. The network impedance tester using the latest frequency synthesis technology DDS, realize the frequency range of 1 kHz to 200 kHz sine signal output, through the amplifier will its peak enlarged after 2 V, and I/V of the transformed to be measured by the peak signal detection, and then get amplitude ratio, namely the impedance
江苏大学生电子设计竞赛 设计报告
参赛学校：南京信息工程大学 参赛队员姓名：王余祥 韩金璐 朱勇安 参赛队编号： 竞赛选题： 网络阻抗测试仪 （D 题）
2012 年江苏省大学生电子设计竞赛（TI 杯）试题 ..................................................................... 2 网络阻抗测试仪（D 题） .............................................................................................................. 2 一、摘 要 .......................................................................................................................... 2 1.核心技术 ...................................................................................................................... 2 2.关键字 ........................................................................................................................... 2 3.Abstract.......................................................................................................................... 2 4.Keywords ....................................................................................................................... 3 二、系统方案 .......................................................................................................................... 3 1.赛题分析 ....................................................................................................................... 3 2.方案选择 ....................................................................................................................... 4 3.系统结构 ....................................................................................................................... 8 4.实现方法 ....................................................................................................................... 8 三、分析计算 ........................................................................................................................ 11 1.公式推导 .................................................................................................................... 11 2.理论分析（测量、处理、控制）.............................................................................. 14 测量计算 ........................................................................................................................ 17 四、程序设计 ........................................................................................................................ 19 软件功能结构 ........................................................................................................................ 19 五、测试 ................................................................................................................................ 25 1.测试仪器 ..................................................................................................................... 26 测量数据 ........................................................................................................................ 26 3.误差分析 ..................................................................................................................... 26 4.测量结论 ..................................................................................................................... 27 六、总结展望 ........................................................................................................................ 27 1.完成程度 ..................................................................................................................... 27 2.存在问题 ..................................................................................................................... 28 3.设想展望 ..................................................................................................................... 28 七、附录 ................................................................................................................................ 28
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2012 年江苏省大学生电子设计竞赛（TI 杯）试题
网络阻抗测试仪（D 题）
一、摘
要
ቤተ መጻሕፍቲ ባይዱ
1.核心技术
本网络阻抗测试仪以 MSP430 为控制和数据处理核心，由正弦信号发生器模 块、I/V 变换模块、峰值检测模块、A/D 转换模块、键盘模块以及液晶显示模块 组 成 。这个 网络阻抗测试仪 利用最新的频率合 成技术 DDS, 实现了频率范围 为 1kHz～200KHz 的正弦信号输出，通过放大器将其峰值放大成 2V 后，与 I/V 变换 后的待测信号经峰值检波，继而得到幅值比，即阻抗模，将待测信号通过高速比 较器进行鉴相， 得到的相位差即为阻抗角。把上述的测量结果经单片机处理后用 液晶显示，并通过键盘控制正弦波的频率步进，用户界面友好。在系统设计上， 尽可能的降低功耗。为了提高测量精度，将各部分电路的误差合理分配，使电路 达到最佳测量效果。